diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-03-31 20:05:24 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-03-31 20:05:24 +0200 |
commit | b3fd4ea9df2d5c39cd6ce08faf965ed669eb3b56 (patch) | |
tree | de45e2aff3106f4fa413ea3f08a7f8c969c0479b | |
parent | Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/k... (diff) | |
parent | Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paul... (diff) | |
download | linux-b3fd4ea9df2d5c39cd6ce08faf965ed669eb3b56.tar.xz linux-b3fd4ea9df2d5c39cd6ce08faf965ed669eb3b56.zip |
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU updates from Ingo Molnar:
"Main changes:
- Torture-test changes, including refactoring of rcutorture and
introduction of a vestigial locktorture.
- Real-time latency fixes.
- Documentation updates.
- Miscellaneous fixes"
* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (77 commits)
rcu: Provide grace-period piggybacking API
rcu: Ensure kernel/rcu/rcu.h can be sourced/used stand-alone
rcu: Fix sparse warning for rcu_expedited from kernel/ksysfs.c
notifier: Substitute rcu_access_pointer() for rcu_dereference_raw()
Documentation/memory-barriers.txt: Clarify release/acquire ordering
rcutorture: Save kvm.sh output to log
rcutorture: Add a lock_busted to test the test
rcutorture: Place kvm-test-1-run.sh output into res directory
rcutorture: Rename TREE_RCU-Kconfig.txt
locktorture: Add kvm-recheck.sh plug-in for locktorture
rcutorture: Gracefully handle NULL cleanup hooks
locktorture: Add vestigial locktorture configuration
rcutorture: Introduce "rcu" directory level underneath configs
rcutorture: Rename kvm-test-1-rcu.sh
rcutorture: Remove RCU dependencies from ver_functions.sh API
rcutorture: Create CFcommon file for common Kconfig parameters
rcutorture: Create config files for scripted test-the-test testing
rcutorture: Add an rcu_busted to test the test
locktorture: Add a lock-torture kernel module
rcutorture: Abstract kvm-recheck.sh
...
-rw-r--r-- | Documentation/RCU/RTFP.txt | 149 | ||||
-rw-r--r-- | Documentation/RCU/checklist.txt | 18 | ||||
-rw-r--r-- | Documentation/kernel-per-CPU-kthreads.txt | 13 | ||||
-rw-r--r-- | Documentation/memory-barriers.txt | 137 | ||||
-rw-r--r-- | fs/file.c | 2 | ||||
-rw-r--r-- | include/linux/rculist.h | 17 | ||||
-rw-r--r-- | include/linux/rcupdate.h | 94 | ||||
-rw-r--r-- | include/linux/rcutiny.h | 20 | ||||
-rw-r--r-- | include/linux/rcutree.h | 8 | ||||
-rw-r--r-- | include/linux/srcu.h | 4 | ||||
-rw-r--r-- | include/linux/torture.h | 100 | ||||
-rw-r--r-- | kernel/Makefile | 1 | ||||
-rw-r--r-- | kernel/ksysfs.c | 2 | ||||
-rw-r--r-- | kernel/locking/Makefile | 1 | ||||
-rw-r--r-- | kernel/locking/locktorture.c | 452 | ||||
-rw-r--r-- | kernel/notifier.c | 2 | ||||
-rw-r--r-- | kernel/rcu/Makefile | 2 | ||||
-rw-r--r-- | kernel/rcu/rcu.h | 7 | ||||
-rw-r--r-- | kernel/rcu/rcutorture.c (renamed from kernel/rcu/torture.c) | 996 | ||||
-rw-r--r-- | kernel/rcu/srcu.c | 11 | ||||
-rw-r--r-- | kernel/rcu/tiny.c | 8 | ||||
-rw-r--r-- | kernel/rcu/tiny_plugin.h | 4 | ||||
-rw-r--r-- | kernel/rcu/tree.c | 80 | ||||
-rw-r--r-- | kernel/rcu/tree.h | 4 | ||||
-rw-r--r-- | kernel/rcu/tree_plugin.h | 19 | ||||
-rw-r--r-- | kernel/rcu/tree_trace.c | 6 | ||||
-rw-r--r-- | kernel/rcu/update.c | 5 | ||||
-rw-r--r-- | kernel/torture.c | 719 | ||||
-rw-r--r-- | lib/Kconfig.debug | 20 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/bin/functions.sh | 1 | ||||
-rwxr-xr-x | tools/testing/selftests/rcutorture/bin/kvm-recheck-lock.sh | 51 | ||||
-rwxr-xr-x | tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh | 51 | ||||
-rwxr-xr-x | tools/testing/selftests/rcutorture/bin/kvm-recheck.sh | 13 | ||||
-rwxr-xr-x | tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh (renamed from tools/testing/selftests/rcutorture/bin/kvm-test-1-rcu.sh) | 53 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/bin/kvm.sh | 276 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/lock/BUSTED | 6 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/lock/BUSTED.boot | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/lock/CFLIST | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/lock/CFcommon | 2 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/lock/LOCK01 | 6 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/lock/ver_functions.sh | 43 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/BUSTED | 7 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/BUSTED.boot | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/CFLIST (renamed from tools/testing/selftests/rcutorture/configs/CFLIST) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/CFcommon | 2 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/SRCU-N (renamed from tools/testing/selftests/rcutorture/configs/SRCU-N) | 3 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/SRCU-N.boot (renamed from tools/testing/selftests/rcutorture/configs/SRCU-N.boot) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/SRCU-P (renamed from tools/testing/selftests/rcutorture/configs/SRCU-P) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/SRCU-P.boot (renamed from tools/testing/selftests/rcutorture/configs/SRCU-P.boot) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TINY01 (renamed from tools/testing/selftests/rcutorture/configs/TINY01) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TINY02 (renamed from tools/testing/selftests/rcutorture/configs/TINY02) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE01 (renamed from tools/testing/selftests/rcutorture/configs/TREE01) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE01.boot (renamed from tools/testing/selftests/rcutorture/configs/TREE01.boot) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE02 (renamed from tools/testing/selftests/rcutorture/configs/TREE02) | 3 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE03 (renamed from tools/testing/selftests/rcutorture/configs/TREE03) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE04 (renamed from tools/testing/selftests/rcutorture/configs/TREE04) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE04.boot (renamed from tools/testing/selftests/rcutorture/configs/TREE04.boot) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE05 (renamed from tools/testing/selftests/rcutorture/configs/TREE05) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE05.boot (renamed from tools/testing/selftests/rcutorture/configs/TREE05.boot) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE06 (renamed from tools/testing/selftests/rcutorture/configs/TREE06) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE07 (renamed from tools/testing/selftests/rcutorture/configs/TREE07) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE08 (renamed from tools/testing/selftests/rcutorture/configs/TREE08) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE08-T (renamed from tools/testing/selftests/rcutorture/configs/TREE08-T) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/TREE09 (renamed from tools/testing/selftests/rcutorture/configs/TREE09) | 1 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/CFLIST (renamed from tools/testing/selftests/rcutorture/configs/v0.0/CFLIST) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/N1-S-T-NH-SD-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v0.0/N1-S-T-NH-SD-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/N2-2-t-nh-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v0.0/N2-2-t-nh-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/N3-3-T-nh-SD-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v0.0/N3-3-T-nh-SD-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/N4-A-t-NH-sd-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v0.0/N4-A-t-NH-sd-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/N5-U-T-NH-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v0.0/N5-U-T-NH-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/NT1-nh (renamed from tools/testing/selftests/rcutorture/configs/v0.0/NT1-nh) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/NT3-NH (renamed from tools/testing/selftests/rcutorture/configs/v0.0/NT3-NH) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/P1-S-T-NH-SD-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v0.0/P1-S-T-NH-SD-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/P2-2-t-nh-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v0.0/P2-2-t-nh-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/P3-3-T-nh-SD-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v0.0/P3-3-T-nh-SD-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/P4-A-t-NH-sd-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v0.0/P4-A-t-NH-sd-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/P5-U-T-NH-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v0.0/P5-U-T-NH-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/PT1-nh (renamed from tools/testing/selftests/rcutorture/configs/v0.0/PT1-nh) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/PT2-NH (renamed from tools/testing/selftests/rcutorture/configs/v0.0/PT2-NH) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v0.0/ver_functions.sh (renamed from tools/testing/selftests/rcutorture/configs/v0.0/ver_functions.sh) | 22 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/CFLIST (renamed from tools/testing/selftests/rcutorture/configs/v3.12/CFLIST) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/N1-S-T-NH-SD-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.12/N1-S-T-NH-SD-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/N2-2-t-nh-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.12/N2-2-t-nh-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/N3-3-T-nh-SD-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.12/N3-3-T-nh-SD-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/N4-A-t-NH-sd-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.12/N4-A-t-NH-sd-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/N5-U-T-NH-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.12/N5-U-T-NH-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/N6---t-nh-SD-smp-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.12/N6---t-nh-SD-smp-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/N7-4-T-NH-SD-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.12/N7-4-T-NH-SD-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/N8-2-T-NH-SD-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.12/N8-2-T-NH-SD-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/NT1-nh (renamed from tools/testing/selftests/rcutorture/configs/v3.12/NT1-nh) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/NT3-NH (renamed from tools/testing/selftests/rcutorture/configs/v3.12/NT3-NH) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P1-S-T-NH-SD-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P1-S-T-NH-SD-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P2-2-t-nh-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P2-2-t-nh-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P3-3-T-nh-SD-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P3-3-T-nh-SD-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P4-A-t-NH-sd-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P4-A-t-NH-sd-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P5-U-T-NH-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P5-U-T-NH-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P6---t-nh-SD-smp-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P6---t-nh-SD-smp-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-all (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP-all) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-none (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP-none) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/PT1-nh (renamed from tools/testing/selftests/rcutorture/configs/v3.12/PT1-nh) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.12/PT2-NH (renamed from tools/testing/selftests/rcutorture/configs/v3.12/PT2-NH) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/CFLIST (renamed from tools/testing/selftests/rcutorture/configs/v3.3/CFLIST) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/N1-S-T-NH-SD-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.3/N1-S-T-NH-SD-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/N2-2-t-nh-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.3/N2-2-t-nh-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/N3-3-T-nh-SD-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.3/N3-3-T-nh-SD-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/N4-A-t-NH-sd-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.3/N4-A-t-NH-sd-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/N5-U-T-NH-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.3/N5-U-T-NH-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/NT1-nh (renamed from tools/testing/selftests/rcutorture/configs/v3.3/NT1-nh) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/NT3-NH (renamed from tools/testing/selftests/rcutorture/configs/v3.3/NT3-NH) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/P1-S-T-NH-SD-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.3/P1-S-T-NH-SD-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/P2-2-t-nh-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.3/P2-2-t-nh-sd-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/P3-3-T-nh-SD-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.3/P3-3-T-nh-SD-SMP-hp) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/P4-A-t-NH-sd-SMP-HP (renamed from tools/testing/selftests/rcutorture/configs/v3.3/P4-A-t-NH-sd-SMP-HP) | 0 | ||||
-rw-r--r-- | tools/testing/selftests/rcutorture/configs/rcu/v3.3/P5-U-T-NH-sd-SMP-hp (renamed from tools/testing/selftests/rcutorture/configs/v3.3/P5-U-T-NH-sd-SMP-hp) | 0 | ||||
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-rw-r--r-- | tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt (renamed from tools/testing/selftests/rcutorture/doc/TREE_RCU-Kconfig.txt) | 0 |
137 files changed, 2454 insertions, 1078 deletions
diff --git a/Documentation/RCU/RTFP.txt b/Documentation/RCU/RTFP.txt index 273e654d7d08..2f0fcb2112d2 100644 --- a/Documentation/RCU/RTFP.txt +++ b/Documentation/RCU/RTFP.txt @@ -31,6 +31,14 @@ has lapsed, so this approach may be used in non-GPL software, if desired. (In contrast, implementation of RCU is permitted only in software licensed under either GPL or LGPL. Sorry!!!) +In 1987, Rashid et al. described lazy TLB-flush [RichardRashid87a]. +At first glance, this has nothing to do with RCU, but nevertheless +this paper helped inspire the update-side batching used in the later +RCU implementation in DYNIX/ptx. In 1988, Barbara Liskov published +a description of Argus that noted that use of out-of-date values can +be tolerated in some situations. Thus, this paper provides some early +theoretical justification for use of stale data. + In 1990, Pugh [Pugh90] noted that explicitly tracking which threads were reading a given data structure permitted deferred free to operate in the presence of non-terminating threads. However, this explicit @@ -41,11 +49,11 @@ providing a fine-grained locking design, however, it would be interesting to see how much of the performance advantage reported in 1990 remains today. -At about this same time, Adams [Adams91] described ``chaotic relaxation'', -where the normal barriers between successive iterations of convergent -numerical algorithms are relaxed, so that iteration $n$ might use -data from iteration $n-1$ or even $n-2$. This introduces error, -which typically slows convergence and thus increases the number of +At about this same time, Andrews [Andrews91textbook] described ``chaotic +relaxation'', where the normal barriers between successive iterations +of convergent numerical algorithms are relaxed, so that iteration $n$ +might use data from iteration $n-1$ or even $n-2$. This introduces +error, which typically slows convergence and thus increases the number of iterations required. However, this increase is sometimes more than made up for by a reduction in the number of expensive barrier operations, which are otherwise required to synchronize the threads at the end @@ -55,7 +63,8 @@ is thus inapplicable to most data structures in operating-system kernels. In 1992, Henry (now Alexia) Massalin completed a dissertation advising parallel programmers to defer processing when feasible to simplify -synchronization. RCU makes extremely heavy use of this advice. +synchronization [HMassalinPhD]. RCU makes extremely heavy use of +this advice. In 1993, Jacobson [Jacobson93] verbally described what is perhaps the simplest deferred-free technique: simply waiting a fixed amount of time @@ -90,27 +99,29 @@ mechanism, which is quite similar to RCU [Gamsa99]. These operating systems made pervasive use of RCU in place of "existence locks", which greatly simplifies locking hierarchies and helps avoid deadlocks. -2001 saw the first RCU presentation involving Linux [McKenney01a] -at OLS. The resulting abundance of RCU patches was presented the -following year [McKenney02a], and use of RCU in dcache was first -described that same year [Linder02a]. +The year 2000 saw an email exchange that would likely have +led to yet another independent invention of something like RCU +[RustyRussell2000a,RustyRussell2000b]. Instead, 2001 saw the first +RCU presentation involving Linux [McKenney01a] at OLS. The resulting +abundance of RCU patches was presented the following year [McKenney02a], +and use of RCU in dcache was first described that same year [Linder02a]. Also in 2002, Michael [Michael02b,Michael02a] presented "hazard-pointer" techniques that defer the destruction of data structures to simplify non-blocking synchronization (wait-free synchronization, lock-free synchronization, and obstruction-free synchronization are all examples of -non-blocking synchronization). In particular, this technique eliminates -locking, reduces contention, reduces memory latency for readers, and -parallelizes pipeline stalls and memory latency for writers. However, -these techniques still impose significant read-side overhead in the -form of memory barriers. Researchers at Sun worked along similar lines -in the same timeframe [HerlihyLM02]. These techniques can be thought -of as inside-out reference counts, where the count is represented by the -number of hazard pointers referencing a given data structure rather than -the more conventional counter field within the data structure itself. -The key advantage of inside-out reference counts is that they can be -stored in immortal variables, thus allowing races between access and -deletion to be avoided. +non-blocking synchronization). The corresponding journal article appeared +in 2004 [MagedMichael04a]. This technique eliminates locking, reduces +contention, reduces memory latency for readers, and parallelizes pipeline +stalls and memory latency for writers. However, these techniques still +impose significant read-side overhead in the form of memory barriers. +Researchers at Sun worked along similar lines in the same timeframe +[HerlihyLM02]. These techniques can be thought of as inside-out reference +counts, where the count is represented by the number of hazard pointers +referencing a given data structure rather than the more conventional +counter field within the data structure itself. The key advantage +of inside-out reference counts is that they can be stored in immortal +variables, thus allowing races between access and deletion to be avoided. By the same token, RCU can be thought of as a "bulk reference count", where some form of reference counter covers all reference by a given CPU @@ -123,8 +134,10 @@ can be thought of in other terms as well. In 2003, the K42 group described how RCU could be used to create hot-pluggable implementations of operating-system functions [Appavoo03a]. -Later that year saw a paper describing an RCU implementation of System -V IPC [Arcangeli03], and an introduction to RCU in Linux Journal +Later that year saw a paper describing an RCU implementation +of System V IPC [Arcangeli03] (following up on a suggestion by +Hugh Dickins [Dickins02a] and an implementation by Mingming Cao +[MingmingCao2002IPCRCU]), and an introduction to RCU in Linux Journal [McKenney03a]. 2004 has seen a Linux-Journal article on use of RCU in dcache @@ -383,6 +396,21 @@ for Programming Languages and Operating Systems}" } } +@phdthesis{HMassalinPhD +,author="H. Massalin" +,title="Synthesis: An Efficient Implementation of Fundamental Operating +System Services" +,school="Columbia University" +,address="New York, NY" +,year="1992" +,annotation={ + Mondo optimizing compiler. + Wait-free stuff. + Good advice: defer work to avoid synchronization. See page 90 + (PDF page 106), Section 5.4, fourth bullet point. +} +} + @unpublished{Jacobson93 ,author="Van Jacobson" ,title="Avoid Read-Side Locking Via Delayed Free" @@ -671,6 +699,20 @@ Orran Krieger and Rusty Russell and Dipankar Sarma and Maneesh Soni" [Viewed October 18, 2004]" } +@conference{Michael02b +,author="Maged M. Michael" +,title="High Performance Dynamic Lock-Free Hash Tables and List-Based Sets" +,Year="2002" +,Month="August" +,booktitle="{Proceedings of the 14\textsuperscript{th} Annual ACM +Symposium on Parallel +Algorithms and Architecture}" +,pages="73-82" +,annotation={ +Like the title says... +} +} + @Conference{Linder02a ,Author="Hanna Linder and Dipankar Sarma and Maneesh Soni" ,Title="Scalability of the Directory Entry Cache" @@ -727,6 +769,24 @@ Andrea Arcangeli and Andi Kleen and Orran Krieger and Rusty Russell" } } +@conference{Michael02a +,author="Maged M. Michael" +,title="Safe Memory Reclamation for Dynamic Lock-Free Objects Using Atomic +Reads and Writes" +,Year="2002" +,Month="August" +,booktitle="{Proceedings of the 21\textsuperscript{st} Annual ACM +Symposium on Principles of Distributed Computing}" +,pages="21-30" +,annotation={ + Each thread keeps an array of pointers to items that it is + currently referencing. Sort of an inside-out garbage collection + mechanism, but one that requires the accessing code to explicitly + state its needs. Also requires read-side memory barriers on + most architectures. +} +} + @unpublished{Dickins02a ,author="Hugh Dickins" ,title="Use RCU for System-V IPC" @@ -735,6 +795,17 @@ Andrea Arcangeli and Andi Kleen and Orran Krieger and Rusty Russell" ,note="private communication" } +@InProceedings{HerlihyLM02 +,author={Maurice Herlihy and Victor Luchangco and Mark Moir} +,title="The Repeat Offender Problem: A Mechanism for Supporting Dynamic-Sized, +Lock-Free Data Structures" +,booktitle={Proceedings of 16\textsuperscript{th} International +Symposium on Distributed Computing} +,year=2002 +,month="October" +,pages="339-353" +} + @unpublished{Sarma02b ,Author="Dipankar Sarma" ,Title="Some dcache\_rcu benchmark numbers" @@ -749,6 +820,19 @@ Andrea Arcangeli and Andi Kleen and Orran Krieger and Rusty Russell" } } +@unpublished{MingmingCao2002IPCRCU +,Author="Mingming Cao" +,Title="[PATCH]updated ipc lock patch" +,month="October" +,year="2002" +,note="Available: +\url{https://lkml.org/lkml/2002/10/24/262} +[Viewed February 15, 2014]" +,annotation={ + Mingming Cao's patch to introduce RCU to SysV IPC. +} +} + @unpublished{LinusTorvalds2003a ,Author="Linus Torvalds" ,Title="Re: {[PATCH]} small fixes in brlock.h" @@ -982,6 +1066,23 @@ Realtime Applications" } } +@article{MagedMichael04a +,author="Maged M. Michael" +,title="Hazard Pointers: Safe Memory Reclamation for Lock-Free Objects" +,Year="2004" +,Month="June" +,journal="IEEE Transactions on Parallel and Distributed Systems" +,volume="15" +,number="6" +,pages="491-504" +,url="Available: +\url{http://www.research.ibm.com/people/m/michael/ieeetpds-2004.pdf} +[Viewed March 1, 2005]" +,annotation={ + New canonical hazard-pointer citation. +} +} + @phdthesis{PaulEdwardMcKenneyPhD ,author="Paul E. McKenney" ,title="Exploiting Deferred Destruction: diff --git a/Documentation/RCU/checklist.txt b/Documentation/RCU/checklist.txt index 91266193b8f4..9d10d1db16a5 100644 --- a/Documentation/RCU/checklist.txt +++ b/Documentation/RCU/checklist.txt @@ -256,10 +256,10 @@ over a rather long period of time, but improvements are always welcome! variations on this theme. b. Limiting update rate. For example, if updates occur only - once per hour, then no explicit rate limiting is required, - unless your system is already badly broken. The dcache - subsystem takes this approach -- updates are guarded - by a global lock, limiting their rate. + once per hour, then no explicit rate limiting is + required, unless your system is already badly broken. + Older versions of the dcache subsystem take this approach, + guarding updates with a global lock, limiting their rate. c. Trusted update -- if updates can only be done manually by superuser or some other trusted user, then it might not @@ -268,7 +268,8 @@ over a rather long period of time, but improvements are always welcome! the machine. d. Use call_rcu_bh() rather than call_rcu(), in order to take - advantage of call_rcu_bh()'s faster grace periods. + advantage of call_rcu_bh()'s faster grace periods. (This + is only a partial solution, though.) e. Periodically invoke synchronize_rcu(), permitting a limited number of updates per grace period. @@ -276,6 +277,13 @@ over a rather long period of time, but improvements are always welcome! The same cautions apply to call_rcu_bh(), call_rcu_sched(), call_srcu(), and kfree_rcu(). + Note that although these primitives do take action to avoid memory + exhaustion when any given CPU has too many callbacks, a determined + user could still exhaust memory. This is especially the case + if a system with a large number of CPUs has been configured to + offload all of its RCU callbacks onto a single CPU, or if the + system has relatively little free memory. + 9. All RCU list-traversal primitives, which include rcu_dereference(), list_for_each_entry_rcu(), and list_for_each_safe_rcu(), must be either within an RCU read-side diff --git a/Documentation/kernel-per-CPU-kthreads.txt b/Documentation/kernel-per-CPU-kthreads.txt index 827104fb9364..f3cd299fcc41 100644 --- a/Documentation/kernel-per-CPU-kthreads.txt +++ b/Documentation/kernel-per-CPU-kthreads.txt @@ -162,7 +162,18 @@ Purpose: Execute workqueue requests To reduce its OS jitter, do any of the following: 1. Run your workload at a real-time priority, which will allow preempting the kworker daemons. -2. Do any of the following needed to avoid jitter that your +2. A given workqueue can be made visible in the sysfs filesystem + by passing the WQ_SYSFS to that workqueue's alloc_workqueue(). + Such a workqueue can be confined to a given subset of the + CPUs using the /sys/devices/virtual/workqueue/*/cpumask sysfs + files. The set of WQ_SYSFS workqueues can be displayed using + "ls sys/devices/virtual/workqueue". That said, the workqueues + maintainer would like to caution people against indiscriminately + sprinkling WQ_SYSFS across all the workqueues. The reason for + caution is that it is easy to add WQ_SYSFS, but because sysfs is + part of the formal user/kernel API, it can be nearly impossible + to remove it, even if its addition was a mistake. +3. Do any of the following needed to avoid jitter that your application cannot tolerate: a. Build your kernel with CONFIG_SLUB=y rather than CONFIG_SLAB=y, thus avoiding the slab allocator's periodic diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt index 102dc19c4119..11c1d2049662 100644 --- a/Documentation/memory-barriers.txt +++ b/Documentation/memory-barriers.txt @@ -608,26 +608,30 @@ as follows: b = p; /* BUG: Compiler can reorder!!! */ do_something(); -The solution is again ACCESS_ONCE(), which preserves the ordering between -the load from variable 'a' and the store to variable 'b': +The solution is again ACCESS_ONCE() and barrier(), which preserves the +ordering between the load from variable 'a' and the store to variable 'b': q = ACCESS_ONCE(a); if (q) { + barrier(); ACCESS_ONCE(b) = p; do_something(); } else { + barrier(); ACCESS_ONCE(b) = p; do_something_else(); } -You could also use barrier() to prevent the compiler from moving -the stores to variable 'b', but barrier() would not prevent the -compiler from proving to itself that a==1 always, so ACCESS_ONCE() -is also needed. +The initial ACCESS_ONCE() is required to prevent the compiler from +proving the value of 'a', and the pair of barrier() invocations are +required to prevent the compiler from pulling the two identical stores +to 'b' out from the legs of the "if" statement. It is important to note that control dependencies absolutely require a a conditional. For example, the following "optimized" version of -the above example breaks ordering: +the above example breaks ordering, which is why the barrier() invocations +are absolutely required if you have identical stores in both legs of +the "if" statement: q = ACCESS_ONCE(a); ACCESS_ONCE(b) = p; /* BUG: No ordering vs. load from a!!! */ @@ -643,9 +647,11 @@ It is of course legal for the prior load to be part of the conditional, for example, as follows: if (ACCESS_ONCE(a) > 0) { + barrier(); ACCESS_ONCE(b) = q / 2; do_something(); } else { + barrier(); ACCESS_ONCE(b) = q / 3; do_something_else(); } @@ -659,9 +665,11 @@ the needed conditional. For example: q = ACCESS_ONCE(a); if (q % MAX) { + barrier(); ACCESS_ONCE(b) = p; do_something(); } else { + barrier(); ACCESS_ONCE(b) = p; do_something_else(); } @@ -723,8 +731,13 @@ In summary: use smb_rmb(), smp_wmb(), or, in the case of prior stores and later loads, smp_mb(). + (*) If both legs of the "if" statement begin with identical stores + to the same variable, a barrier() statement is required at the + beginning of each leg of the "if" statement. + (*) Control dependencies require at least one run-time conditional - between the prior load and the subsequent store. If the compiler + between the prior load and the subsequent store, and this + conditional must involve the prior load. If the compiler is able to optimize the conditional away, it will have also optimized away the ordering. Careful use of ACCESS_ONCE() can help to preserve the needed conditional. @@ -1249,6 +1262,23 @@ The ACCESS_ONCE() function can prevent any number of optimizations that, while perfectly safe in single-threaded code, can be fatal in concurrent code. Here are some examples of these sorts of optimizations: + (*) The compiler is within its rights to reorder loads and stores + to the same variable, and in some cases, the CPU is within its + rights to reorder loads to the same variable. This means that + the following code: + + a[0] = x; + a[1] = x; + + Might result in an older value of x stored in a[1] than in a[0]. + Prevent both the compiler and the CPU from doing this as follows: + + a[0] = ACCESS_ONCE(x); + a[1] = ACCESS_ONCE(x); + + In short, ACCESS_ONCE() provides cache coherence for accesses from + multiple CPUs to a single variable. + (*) The compiler is within its rights to merge successive loads from the same variable. Such merging can cause the compiler to "optimize" the following code: @@ -1644,12 +1674,12 @@ for each construct. These operations all imply certain barriers: Memory operations issued after the ACQUIRE will be completed after the ACQUIRE operation has completed. - Memory operations issued before the ACQUIRE may be completed after the - ACQUIRE operation has completed. An smp_mb__before_spinlock(), combined - with a following ACQUIRE, orders prior loads against subsequent stores and - stores and prior stores against subsequent stores. Note that this is - weaker than smp_mb()! The smp_mb__before_spinlock() primitive is free on - many architectures. + Memory operations issued before the ACQUIRE may be completed after + the ACQUIRE operation has completed. An smp_mb__before_spinlock(), + combined with a following ACQUIRE, orders prior loads against + subsequent loads and stores and also orders prior stores against + subsequent stores. Note that this is weaker than smp_mb()! The + smp_mb__before_spinlock() primitive is free on many architectures. (2) RELEASE operation implication: @@ -1694,24 +1724,21 @@ may occur as: ACQUIRE M, STORE *B, STORE *A, RELEASE M -This same reordering can of course occur if the lock's ACQUIRE and RELEASE are -to the same lock variable, but only from the perspective of another CPU not -holding that lock. - -In short, a RELEASE followed by an ACQUIRE may -not- be assumed to be a full -memory barrier because it is possible for a preceding RELEASE to pass a -later ACQUIRE from the viewpoint of the CPU, but not from the viewpoint -of the compiler. Note that deadlocks cannot be introduced by this -interchange because if such a deadlock threatened, the RELEASE would -simply complete. - -If it is necessary for a RELEASE-ACQUIRE pair to produce a full barrier, the -ACQUIRE can be followed by an smp_mb__after_unlock_lock() invocation. This -will produce a full barrier if either (a) the RELEASE and the ACQUIRE are -executed by the same CPU or task, or (b) the RELEASE and ACQUIRE act on the -same variable. The smp_mb__after_unlock_lock() primitive is free on many -architectures. Without smp_mb__after_unlock_lock(), the critical sections -corresponding to the RELEASE and the ACQUIRE can cross: +When the ACQUIRE and RELEASE are a lock acquisition and release, +respectively, this same reordering can occur if the lock's ACQUIRE and +RELEASE are to the same lock variable, but only from the perspective of +another CPU not holding that lock. In short, a ACQUIRE followed by an +RELEASE may -not- be assumed to be a full memory barrier. + +Similarly, the reverse case of a RELEASE followed by an ACQUIRE does not +imply a full memory barrier. If it is necessary for a RELEASE-ACQUIRE +pair to produce a full barrier, the ACQUIRE can be followed by an +smp_mb__after_unlock_lock() invocation. This will produce a full barrier +if either (a) the RELEASE and the ACQUIRE are executed by the same +CPU or task, or (b) the RELEASE and ACQUIRE act on the same variable. +The smp_mb__after_unlock_lock() primitive is free on many architectures. +Without smp_mb__after_unlock_lock(), the CPU's execution of the critical +sections corresponding to the RELEASE and the ACQUIRE can cross, so that: *A = a; RELEASE M @@ -1722,7 +1749,36 @@ could occur as: ACQUIRE N, STORE *B, STORE *A, RELEASE M -With smp_mb__after_unlock_lock(), they cannot, so that: +It might appear that this reordering could introduce a deadlock. +However, this cannot happen because if such a deadlock threatened, +the RELEASE would simply complete, thereby avoiding the deadlock. + + Why does this work? + + One key point is that we are only talking about the CPU doing + the reordering, not the compiler. If the compiler (or, for + that matter, the developer) switched the operations, deadlock + -could- occur. + + But suppose the CPU reordered the operations. In this case, + the unlock precedes the lock in the assembly code. The CPU + simply elected to try executing the later lock operation first. + If there is a deadlock, this lock operation will simply spin (or + try to sleep, but more on that later). The CPU will eventually + execute the unlock operation (which preceded the lock operation + in the assembly code), which will unravel the potential deadlock, + allowing the lock operation to succeed. + + But what if the lock is a sleeplock? In that case, the code will + try to enter the scheduler, where it will eventually encounter + a memory barrier, which will force the earlier unlock operation + to complete, again unraveling the deadlock. There might be + a sleep-unlock race, but the locking primitive needs to resolve + such races properly in any case. + +With smp_mb__after_unlock_lock(), the two critical sections cannot overlap. +For example, with the following code, the store to *A will always be +seen by other CPUs before the store to *B: *A = a; RELEASE M @@ -1730,13 +1786,18 @@ With smp_mb__after_unlock_lock(), they cannot, so that: smp_mb__after_unlock_lock(); *B = b; -will always occur as either of the following: +The operations will always occur in one of the following orders: - STORE *A, RELEASE, ACQUIRE, STORE *B - STORE *A, ACQUIRE, RELEASE, STORE *B + STORE *A, RELEASE, ACQUIRE, smp_mb__after_unlock_lock(), STORE *B + STORE *A, ACQUIRE, RELEASE, smp_mb__after_unlock_lock(), STORE *B + ACQUIRE, STORE *A, RELEASE, smp_mb__after_unlock_lock(), STORE *B If the RELEASE and ACQUIRE were instead both operating on the same lock -variable, only the first of these two alternatives can occur. +variable, only the first of these alternatives can occur. In addition, +the more strongly ordered systems may rule out some of the above orders. +But in any case, as noted earlier, the smp_mb__after_unlock_lock() +ensures that the store to *A will always be seen as happening before +the store to *B. Locks and semaphores may not provide any guarantee of ordering on UP compiled systems, and so cannot be counted on in such a situation to actually achieve @@ -2757,7 +2818,7 @@ in that order, but, without intervention, the sequence may have almost any combination of elements combined or discarded, provided the program's view of the world remains consistent. Note that ACCESS_ONCE() is -not- optional in the above example, as there are architectures where a given CPU might -interchange successive loads to the same location. On such architectures, +reorder successive loads to the same location. On such architectures, ACCESS_ONCE() does whatever is necessary to prevent this, for example, on Itanium the volatile casts used by ACCESS_ONCE() cause GCC to emit the special ld.acq and st.rel instructions that prevent such reordering. diff --git a/fs/file.c b/fs/file.c index eb56a13dab3e..b61293badfb1 100644 --- a/fs/file.c +++ b/fs/file.c @@ -497,7 +497,7 @@ repeat: error = fd; #if 1 /* Sanity check */ - if (rcu_dereference_raw(fdt->fd[fd]) != NULL) { + if (rcu_access_pointer(fdt->fd[fd]) != NULL) { printk(KERN_WARNING "alloc_fd: slot %d not NULL!\n", fd); rcu_assign_pointer(fdt->fd[fd], NULL); } diff --git a/include/linux/rculist.h b/include/linux/rculist.h index dbaf99084112..8183b46fbaa2 100644 --- a/include/linux/rculist.h +++ b/include/linux/rculist.h @@ -247,9 +247,10 @@ static inline void list_splice_init_rcu(struct list_head *list, * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock(). */ #define list_entry_rcu(ptr, type, member) \ - ({typeof (*ptr) __rcu *__ptr = (typeof (*ptr) __rcu __force *)ptr; \ - container_of((typeof(ptr))rcu_dereference_raw(__ptr), type, member); \ - }) +({ \ + typeof(*ptr) __rcu *__ptr = (typeof(*ptr) __rcu __force *)ptr; \ + container_of((typeof(ptr))rcu_dereference_raw(__ptr), type, member); \ +}) /** * Where are list_empty_rcu() and list_first_entry_rcu()? @@ -285,11 +286,11 @@ static inline void list_splice_init_rcu(struct list_head *list, * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock(). */ #define list_first_or_null_rcu(ptr, type, member) \ - ({struct list_head *__ptr = (ptr); \ - struct list_head *__next = ACCESS_ONCE(__ptr->next); \ - likely(__ptr != __next) ? \ - list_entry_rcu(__next, type, member) : NULL; \ - }) +({ \ + struct list_head *__ptr = (ptr); \ + struct list_head *__next = ACCESS_ONCE(__ptr->next); \ + likely(__ptr != __next) ? list_entry_rcu(__next, type, member) : NULL; \ +}) /** * list_for_each_entry_rcu - iterate over rcu list of given type diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index adff3c99dcaa..00a7fd61b3c6 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright IBM Corporation, 2001 * @@ -44,7 +44,9 @@ #include <linux/debugobjects.h> #include <linux/bug.h> #include <linux/compiler.h> +#include <asm/barrier.h> +extern int rcu_expedited; /* for sysctl */ #ifdef CONFIG_RCU_TORTURE_TEST extern int rcutorture_runnable; /* for sysctl */ #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ @@ -479,11 +481,9 @@ static inline void rcu_preempt_sleep_check(void) do { \ rcu_preempt_sleep_check(); \ rcu_lockdep_assert(!lock_is_held(&rcu_bh_lock_map), \ - "Illegal context switch in RCU-bh" \ - " read-side critical section"); \ + "Illegal context switch in RCU-bh read-side critical section"); \ rcu_lockdep_assert(!lock_is_held(&rcu_sched_lock_map), \ - "Illegal context switch in RCU-sched"\ - " read-side critical section"); \ + "Illegal context switch in RCU-sched read-side critical section"); \ } while (0) #else /* #ifdef CONFIG_PROVE_RCU */ @@ -510,43 +510,40 @@ static inline void rcu_preempt_sleep_check(void) #endif /* #else #ifdef __CHECKER__ */ #define __rcu_access_pointer(p, space) \ - ({ \ - typeof(*p) *_________p1 = (typeof(*p)*__force )ACCESS_ONCE(p); \ - rcu_dereference_sparse(p, space); \ - ((typeof(*p) __force __kernel *)(_________p1)); \ - }) +({ \ + typeof(*p) *_________p1 = (typeof(*p) *__force)ACCESS_ONCE(p); \ + rcu_dereference_sparse(p, space); \ + ((typeof(*p) __force __kernel *)(_________p1)); \ +}) #define __rcu_dereference_check(p, c, space) \ - ({ \ - typeof(*p) *_________p1 = (typeof(*p)*__force )ACCESS_ONCE(p); \ - rcu_lockdep_assert(c, "suspicious rcu_dereference_check()" \ - " usage"); \ - rcu_dereference_sparse(p, space); \ - smp_read_barrier_depends(); \ - ((typeof(*p) __force __kernel *)(_________p1)); \ - }) +({ \ + typeof(*p) *_________p1 = (typeof(*p) *__force)ACCESS_ONCE(p); \ + rcu_lockdep_assert(c, "suspicious rcu_dereference_check() usage"); \ + rcu_dereference_sparse(p, space); \ + smp_read_barrier_depends(); /* Dependency order vs. p above. */ \ + ((typeof(*p) __force __kernel *)(_________p1)); \ +}) #define __rcu_dereference_protected(p, c, space) \ - ({ \ - rcu_lockdep_assert(c, "suspicious rcu_dereference_protected()" \ - " usage"); \ - rcu_dereference_sparse(p, space); \ - ((typeof(*p) __force __kernel *)(p)); \ - }) +({ \ + rcu_lockdep_assert(c, "suspicious rcu_dereference_protected() usage"); \ + rcu_dereference_sparse(p, space); \ + ((typeof(*p) __force __kernel *)(p)); \ +}) #define __rcu_access_index(p, space) \ - ({ \ - typeof(p) _________p1 = ACCESS_ONCE(p); \ - rcu_dereference_sparse(p, space); \ - (_________p1); \ - }) +({ \ + typeof(p) _________p1 = ACCESS_ONCE(p); \ + rcu_dereference_sparse(p, space); \ + (_________p1); \ +}) #define __rcu_dereference_index_check(p, c) \ - ({ \ - typeof(p) _________p1 = ACCESS_ONCE(p); \ - rcu_lockdep_assert(c, \ - "suspicious rcu_dereference_index_check()" \ - " usage"); \ - smp_read_barrier_depends(); \ - (_________p1); \ - }) +({ \ + typeof(p) _________p1 = ACCESS_ONCE(p); \ + rcu_lockdep_assert(c, \ + "suspicious rcu_dereference_index_check() usage"); \ + smp_read_barrier_depends(); /* Dependency order vs. p above. */ \ + (_________p1); \ +}) /** * RCU_INITIALIZER() - statically initialize an RCU-protected global variable @@ -585,12 +582,7 @@ static inline void rcu_preempt_sleep_check(void) * please be careful when making changes to rcu_assign_pointer() and the * other macros that it invokes. */ -#define rcu_assign_pointer(p, v) \ - do { \ - smp_wmb(); \ - ACCESS_ONCE(p) = RCU_INITIALIZER(v); \ - } while (0) - +#define rcu_assign_pointer(p, v) smp_store_release(&p, RCU_INITIALIZER(v)) /** * rcu_access_pointer() - fetch RCU pointer with no dereferencing @@ -1015,11 +1007,21 @@ static inline notrace void rcu_read_unlock_sched_notrace(void) #define kfree_rcu(ptr, rcu_head) \ __kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head)) -#ifdef CONFIG_RCU_NOCB_CPU +#if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL) +static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies) +{ + *delta_jiffies = ULONG_MAX; + return 0; +} +#endif /* #if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL) */ + +#if defined(CONFIG_RCU_NOCB_CPU_ALL) +static inline bool rcu_is_nocb_cpu(int cpu) { return true; } +#elif defined(CONFIG_RCU_NOCB_CPU) bool rcu_is_nocb_cpu(int cpu); #else static inline bool rcu_is_nocb_cpu(int cpu) { return false; } -#endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */ +#endif /* Only for use by adaptive-ticks code. */ diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h index 6f01771b571c..425c659d54e5 100644 --- a/include/linux/rcutiny.h +++ b/include/linux/rcutiny.h @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright IBM Corporation, 2008 * @@ -27,6 +27,16 @@ #include <linux/cache.h> +static inline unsigned long get_state_synchronize_rcu(void) +{ + return 0; +} + +static inline void cond_synchronize_rcu(unsigned long oldstate) +{ + might_sleep(); +} + static inline void rcu_barrier_bh(void) { wait_rcu_gp(call_rcu_bh); @@ -68,12 +78,6 @@ static inline void kfree_call_rcu(struct rcu_head *head, call_rcu(head, func); } -static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies) -{ - *delta_jiffies = ULONG_MAX; - return 0; -} - static inline void rcu_note_context_switch(int cpu) { rcu_sched_qs(cpu); diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h index 72137ee8c603..a59ca05fd4e3 100644 --- a/include/linux/rcutree.h +++ b/include/linux/rcutree.h @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright IBM Corporation, 2008 * @@ -31,7 +31,9 @@ #define __LINUX_RCUTREE_H void rcu_note_context_switch(int cpu); +#ifndef CONFIG_RCU_NOCB_CPU_ALL int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies); +#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ void rcu_cpu_stall_reset(void); /* @@ -74,6 +76,8 @@ static inline void synchronize_rcu_bh_expedited(void) void rcu_barrier(void); void rcu_barrier_bh(void); void rcu_barrier_sched(void); +unsigned long get_state_synchronize_rcu(void); +void cond_synchronize_rcu(unsigned long oldstate); extern unsigned long rcutorture_testseq; extern unsigned long rcutorture_vernum; diff --git a/include/linux/srcu.h b/include/linux/srcu.h index 9b058eecd403..a2783cb5d275 100644 --- a/include/linux/srcu.h +++ b/include/linux/srcu.h @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright (C) IBM Corporation, 2006 * Copyright (C) Fujitsu, 2012 diff --git a/include/linux/torture.h b/include/linux/torture.h new file mode 100644 index 000000000000..b2e2b468e511 --- /dev/null +++ b/include/linux/torture.h @@ -0,0 +1,100 @@ +/* + * Common functions for in-kernel torture tests. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. + * + * Copyright IBM Corporation, 2014 + * + * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> + */ + +#ifndef __LINUX_TORTURE_H +#define __LINUX_TORTURE_H + +#include <linux/types.h> +#include <linux/cache.h> +#include <linux/spinlock.h> +#include <linux/threads.h> +#include <linux/cpumask.h> +#include <linux/seqlock.h> +#include <linux/lockdep.h> +#include <linux/completion.h> +#include <linux/debugobjects.h> +#include <linux/bug.h> +#include <linux/compiler.h> + +/* Definitions for a non-string torture-test module parameter. */ +#define torture_param(type, name, init, msg) \ + static type name = init; \ + module_param(name, type, 0444); \ + MODULE_PARM_DESC(name, msg); + +#define TORTURE_FLAG "-torture:" +#define TOROUT_STRING(s) \ + pr_alert("%s" TORTURE_FLAG s "\n", torture_type) +#define VERBOSE_TOROUT_STRING(s) \ + do { if (verbose) pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s); } while (0) +#define VERBOSE_TOROUT_ERRSTRING(s) \ + do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! %s\n", torture_type, s); } while (0) + +/* Definitions for a non-string torture-test module parameter. */ +#define torture_parm(type, name, init, msg) \ + static type name = init; \ + module_param(name, type, 0444); \ + MODULE_PARM_DESC(name, msg); + +/* Definitions for online/offline exerciser. */ +int torture_onoff_init(long ooholdoff, long oointerval); +char *torture_onoff_stats(char *page); +bool torture_onoff_failures(void); + +/* Low-rider random number generator. */ +struct torture_random_state { + unsigned long trs_state; + long trs_count; +}; +#define DEFINE_TORTURE_RANDOM(name) struct torture_random_state name = { 0, 0 } +unsigned long torture_random(struct torture_random_state *trsp); + +/* Task shuffler, which causes CPUs to occasionally go idle. */ +void torture_shuffle_task_register(struct task_struct *tp); +int torture_shuffle_init(long shuffint); + +/* Test auto-shutdown handling. */ +void torture_shutdown_absorb(const char *title); +int torture_shutdown_init(int ssecs, void (*cleanup)(void)); + +/* Task stuttering, which forces load/no-load transitions. */ +void stutter_wait(const char *title); +int torture_stutter_init(int s); + +/* Initialization and cleanup. */ +void torture_init_begin(char *ttype, bool v, int *runnable); +void torture_init_end(void); +bool torture_cleanup(void); +bool torture_must_stop(void); +bool torture_must_stop_irq(void); +void torture_kthread_stopping(char *title); +int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m, + char *f, struct task_struct **tp); +void _torture_stop_kthread(char *m, struct task_struct **tp); + +#define torture_create_kthread(n, arg, tp) \ + _torture_create_kthread(n, (arg), #n, "Creating " #n " task", \ + "Failed to create " #n, &(tp)) +#define torture_stop_kthread(n, tp) \ + _torture_stop_kthread("Stopping " #n " task", &(tp)) + +#endif /* __LINUX_TORTURE_H */ diff --git a/kernel/Makefile b/kernel/Makefile index bc010ee272b6..5c0e7666811d 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -93,6 +93,7 @@ obj-$(CONFIG_PADATA) += padata.o obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_JUMP_LABEL) += jump_label.o obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o +obj-$(CONFIG_TORTURE_TEST) += torture.o $(obj)/configs.o: $(obj)/config_data.h diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c index d945a949760f..e660964086e2 100644 --- a/kernel/ksysfs.c +++ b/kernel/ksysfs.c @@ -19,6 +19,8 @@ #include <linux/sched.h> #include <linux/capability.h> +#include <linux/rcupdate.h> /* rcu_expedited */ + #define KERNEL_ATTR_RO(_name) \ static struct kobj_attribute _name##_attr = __ATTR_RO(_name) diff --git a/kernel/locking/Makefile b/kernel/locking/Makefile index 2a9ee96ecf00..306a76b51e0f 100644 --- a/kernel/locking/Makefile +++ b/kernel/locking/Makefile @@ -23,3 +23,4 @@ obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem-xadd.o obj-$(CONFIG_PERCPU_RWSEM) += percpu-rwsem.o +obj-$(CONFIG_LOCK_TORTURE_TEST) += locktorture.o diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c new file mode 100644 index 000000000000..f26b1a18e34e --- /dev/null +++ b/kernel/locking/locktorture.c @@ -0,0 +1,452 @@ +/* + * Module-based torture test facility for locking + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. + * + * Copyright (C) IBM Corporation, 2014 + * + * Author: Paul E. McKenney <paulmck@us.ibm.com> + * Based on kernel/rcu/torture.c. + */ +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kthread.h> +#include <linux/err.h> +#include <linux/spinlock.h> +#include <linux/smp.h> +#include <linux/interrupt.h> +#include <linux/sched.h> +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/completion.h> +#include <linux/moduleparam.h> +#include <linux/percpu.h> +#include <linux/notifier.h> +#include <linux/reboot.h> +#include <linux/freezer.h> +#include <linux/cpu.h> +#include <linux/delay.h> +#include <linux/stat.h> +#include <linux/slab.h> +#include <linux/trace_clock.h> +#include <asm/byteorder.h> +#include <linux/torture.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>"); + +torture_param(int, nwriters_stress, -1, + "Number of write-locking stress-test threads"); +torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); +torture_param(int, onoff_interval, 0, + "Time between CPU hotplugs (s), 0=disable"); +torture_param(int, shuffle_interval, 3, + "Number of jiffies between shuffles, 0=disable"); +torture_param(int, shutdown_secs, 0, "Shutdown time (j), <= zero to disable."); +torture_param(int, stat_interval, 60, + "Number of seconds between stats printk()s"); +torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable"); +torture_param(bool, verbose, true, + "Enable verbose debugging printk()s"); + +static char *torture_type = "spin_lock"; +module_param(torture_type, charp, 0444); +MODULE_PARM_DESC(torture_type, + "Type of lock to torture (spin_lock, spin_lock_irq, ...)"); + +static atomic_t n_lock_torture_errors; + +static struct task_struct *stats_task; +static struct task_struct **writer_tasks; + +static int nrealwriters_stress; +static bool lock_is_write_held; + +struct lock_writer_stress_stats { + long n_write_lock_fail; + long n_write_lock_acquired; +}; +static struct lock_writer_stress_stats *lwsa; + +#if defined(MODULE) || defined(CONFIG_LOCK_TORTURE_TEST_RUNNABLE) +#define LOCKTORTURE_RUNNABLE_INIT 1 +#else +#define LOCKTORTURE_RUNNABLE_INIT 0 +#endif +int locktorture_runnable = LOCKTORTURE_RUNNABLE_INIT; +module_param(locktorture_runnable, int, 0444); +MODULE_PARM_DESC(locktorture_runnable, "Start locktorture at boot"); + +/* Forward reference. */ +static void lock_torture_cleanup(void); + +/* + * Operations vector for selecting different types of tests. + */ +struct lock_torture_ops { + void (*init)(void); + int (*writelock)(void); + void (*write_delay)(struct torture_random_state *trsp); + void (*writeunlock)(void); + unsigned long flags; + const char *name; +}; + +static struct lock_torture_ops *cur_ops; + +/* + * Definitions for lock torture testing. + */ + +static int torture_lock_busted_write_lock(void) +{ + return 0; /* BUGGY, do not use in real life!!! */ +} + +static void torture_lock_busted_write_delay(struct torture_random_state *trsp) +{ + const unsigned long longdelay_us = 100; + + /* We want a long delay occasionally to force massive contention. */ + if (!(torture_random(trsp) % + (nrealwriters_stress * 2000 * longdelay_us))) + mdelay(longdelay_us); +#ifdef CONFIG_PREEMPT + if (!(torture_random(trsp) % (nrealwriters_stress * 20000))) + preempt_schedule(); /* Allow test to be preempted. */ +#endif +} + +static void torture_lock_busted_write_unlock(void) +{ + /* BUGGY, do not use in real life!!! */ +} + +static struct lock_torture_ops lock_busted_ops = { + .writelock = torture_lock_busted_write_lock, + .write_delay = torture_lock_busted_write_delay, + .writeunlock = torture_lock_busted_write_unlock, + .name = "lock_busted" +}; + +static DEFINE_SPINLOCK(torture_spinlock); + +static int torture_spin_lock_write_lock(void) __acquires(torture_spinlock) +{ + spin_lock(&torture_spinlock); + return 0; +} + +static void torture_spin_lock_write_delay(struct torture_random_state *trsp) +{ + const unsigned long shortdelay_us = 2; + const unsigned long longdelay_us = 100; + + /* We want a short delay mostly to emulate likely code, and + * we want a long delay occasionally to force massive contention. + */ + if (!(torture_random(trsp) % + (nrealwriters_stress * 2000 * longdelay_us))) + mdelay(longdelay_us); + if (!(torture_random(trsp) % + (nrealwriters_stress * 2 * shortdelay_us))) + udelay(shortdelay_us); +#ifdef CONFIG_PREEMPT + if (!(torture_random(trsp) % (nrealwriters_stress * 20000))) + preempt_schedule(); /* Allow test to be preempted. */ +#endif +} + +static void torture_spin_lock_write_unlock(void) __releases(torture_spinlock) +{ + spin_unlock(&torture_spinlock); +} + +static struct lock_torture_ops spin_lock_ops = { + .writelock = torture_spin_lock_write_lock, + .write_delay = torture_spin_lock_write_delay, + .writeunlock = torture_spin_lock_write_unlock, + .name = "spin_lock" +}; + +static int torture_spin_lock_write_lock_irq(void) +__acquires(torture_spinlock_irq) +{ + unsigned long flags; + + spin_lock_irqsave(&torture_spinlock, flags); + cur_ops->flags = flags; + return 0; +} + +static void torture_lock_spin_write_unlock_irq(void) +__releases(torture_spinlock) +{ + spin_unlock_irqrestore(&torture_spinlock, cur_ops->flags); +} + +static struct lock_torture_ops spin_lock_irq_ops = { + .writelock = torture_spin_lock_write_lock_irq, + .write_delay = torture_spin_lock_write_delay, + .writeunlock = torture_lock_spin_write_unlock_irq, + .name = "spin_lock_irq" +}; + +/* + * Lock torture writer kthread. Repeatedly acquires and releases + * the lock, checking for duplicate acquisitions. + */ +static int lock_torture_writer(void *arg) +{ + struct lock_writer_stress_stats *lwsp = arg; + static DEFINE_TORTURE_RANDOM(rand); + + VERBOSE_TOROUT_STRING("lock_torture_writer task started"); + set_user_nice(current, 19); + + do { + schedule_timeout_uninterruptible(1); + cur_ops->writelock(); + if (WARN_ON_ONCE(lock_is_write_held)) + lwsp->n_write_lock_fail++; + lock_is_write_held = 1; + lwsp->n_write_lock_acquired++; + cur_ops->write_delay(&rand); + lock_is_write_held = 0; + cur_ops->writeunlock(); + stutter_wait("lock_torture_writer"); + } while (!torture_must_stop()); + torture_kthread_stopping("lock_torture_writer"); + return 0; +} + +/* + * Create an lock-torture-statistics message in the specified buffer. + */ +static void lock_torture_printk(char *page) +{ + bool fail = 0; + int i; + long max = 0; + long min = lwsa[0].n_write_lock_acquired; + long long sum = 0; + + for (i = 0; i < nrealwriters_stress; i++) { + if (lwsa[i].n_write_lock_fail) + fail = true; + sum += lwsa[i].n_write_lock_acquired; + if (max < lwsa[i].n_write_lock_fail) + max = lwsa[i].n_write_lock_fail; + if (min > lwsa[i].n_write_lock_fail) + min = lwsa[i].n_write_lock_fail; + } + page += sprintf(page, "%s%s ", torture_type, TORTURE_FLAG); + page += sprintf(page, + "Writes: Total: %lld Max/Min: %ld/%ld %s Fail: %d %s\n", + sum, max, min, max / 2 > min ? "???" : "", + fail, fail ? "!!!" : ""); + if (fail) + atomic_inc(&n_lock_torture_errors); +} + +/* + * Print torture statistics. Caller must ensure that there is only one + * call to this function at a given time!!! This is normally accomplished + * by relying on the module system to only have one copy of the module + * loaded, and then by giving the lock_torture_stats kthread full control + * (or the init/cleanup functions when lock_torture_stats thread is not + * running). + */ +static void lock_torture_stats_print(void) +{ + int size = nrealwriters_stress * 200 + 8192; + char *buf; + + buf = kmalloc(size, GFP_KERNEL); + if (!buf) { + pr_err("lock_torture_stats_print: Out of memory, need: %d", + size); + return; + } + lock_torture_printk(buf); + pr_alert("%s", buf); + kfree(buf); +} + +/* + * Periodically prints torture statistics, if periodic statistics printing + * was specified via the stat_interval module parameter. + * + * No need to worry about fullstop here, since this one doesn't reference + * volatile state or register callbacks. + */ +static int lock_torture_stats(void *arg) +{ + VERBOSE_TOROUT_STRING("lock_torture_stats task started"); + do { + schedule_timeout_interruptible(stat_interval * HZ); + lock_torture_stats_print(); + torture_shutdown_absorb("lock_torture_stats"); + } while (!torture_must_stop()); + torture_kthread_stopping("lock_torture_stats"); + return 0; +} + +static inline void +lock_torture_print_module_parms(struct lock_torture_ops *cur_ops, + const char *tag) +{ + pr_alert("%s" TORTURE_FLAG + "--- %s: nwriters_stress=%d stat_interval=%d verbose=%d shuffle_interval=%d stutter=%d shutdown_secs=%d onoff_interval=%d onoff_holdoff=%d\n", + torture_type, tag, nrealwriters_stress, stat_interval, verbose, + shuffle_interval, stutter, shutdown_secs, + onoff_interval, onoff_holdoff); +} + +static void lock_torture_cleanup(void) +{ + int i; + + if (torture_cleanup()) + return; + + if (writer_tasks) { + for (i = 0; i < nrealwriters_stress; i++) + torture_stop_kthread(lock_torture_writer, + writer_tasks[i]); + kfree(writer_tasks); + writer_tasks = NULL; + } + + torture_stop_kthread(lock_torture_stats, stats_task); + lock_torture_stats_print(); /* -After- the stats thread is stopped! */ + + if (atomic_read(&n_lock_torture_errors)) + lock_torture_print_module_parms(cur_ops, + "End of test: FAILURE"); + else if (torture_onoff_failures()) + lock_torture_print_module_parms(cur_ops, + "End of test: LOCK_HOTPLUG"); + else + lock_torture_print_module_parms(cur_ops, + "End of test: SUCCESS"); +} + +static int __init lock_torture_init(void) +{ + int i; + int firsterr = 0; + static struct lock_torture_ops *torture_ops[] = { + &lock_busted_ops, &spin_lock_ops, &spin_lock_irq_ops, + }; + + torture_init_begin(torture_type, verbose, &locktorture_runnable); + + /* Process args and tell the world that the torturer is on the job. */ + for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { + cur_ops = torture_ops[i]; + if (strcmp(torture_type, cur_ops->name) == 0) + break; + } + if (i == ARRAY_SIZE(torture_ops)) { + pr_alert("lock-torture: invalid torture type: \"%s\"\n", + torture_type); + pr_alert("lock-torture types:"); + for (i = 0; i < ARRAY_SIZE(torture_ops); i++) + pr_alert(" %s", torture_ops[i]->name); + pr_alert("\n"); + torture_init_end(); + return -EINVAL; + } + if (cur_ops->init) + cur_ops->init(); /* no "goto unwind" prior to this point!!! */ + + if (nwriters_stress >= 0) + nrealwriters_stress = nwriters_stress; + else + nrealwriters_stress = 2 * num_online_cpus(); + lock_torture_print_module_parms(cur_ops, "Start of test"); + + /* Initialize the statistics so that each run gets its own numbers. */ + + lock_is_write_held = 0; + lwsa = kmalloc(sizeof(*lwsa) * nrealwriters_stress, GFP_KERNEL); + if (lwsa == NULL) { + VERBOSE_TOROUT_STRING("lwsa: Out of memory"); + firsterr = -ENOMEM; + goto unwind; + } + for (i = 0; i < nrealwriters_stress; i++) { + lwsa[i].n_write_lock_fail = 0; + lwsa[i].n_write_lock_acquired = 0; + } + + /* Start up the kthreads. */ + + if (onoff_interval > 0) { + firsterr = torture_onoff_init(onoff_holdoff * HZ, + onoff_interval * HZ); + if (firsterr) + goto unwind; + } + if (shuffle_interval > 0) { + firsterr = torture_shuffle_init(shuffle_interval); + if (firsterr) + goto unwind; + } + if (shutdown_secs > 0) { + firsterr = torture_shutdown_init(shutdown_secs, + lock_torture_cleanup); + if (firsterr) + goto unwind; + } + if (stutter > 0) { + firsterr = torture_stutter_init(stutter); + if (firsterr) + goto unwind; + } + + writer_tasks = kzalloc(nrealwriters_stress * sizeof(writer_tasks[0]), + GFP_KERNEL); + if (writer_tasks == NULL) { + VERBOSE_TOROUT_ERRSTRING("writer_tasks: Out of memory"); + firsterr = -ENOMEM; + goto unwind; + } + for (i = 0; i < nrealwriters_stress; i++) { + firsterr = torture_create_kthread(lock_torture_writer, &lwsa[i], + writer_tasks[i]); + if (firsterr) + goto unwind; + } + if (stat_interval > 0) { + firsterr = torture_create_kthread(lock_torture_stats, NULL, + stats_task); + if (firsterr) + goto unwind; + } + torture_init_end(); + return 0; + +unwind: + torture_init_end(); + lock_torture_cleanup(); + return firsterr; +} + +module_init(lock_torture_init); +module_exit(lock_torture_cleanup); diff --git a/kernel/notifier.c b/kernel/notifier.c index 2d5cc4ccff7f..db4c8b08a50c 100644 --- a/kernel/notifier.c +++ b/kernel/notifier.c @@ -309,7 +309,7 @@ int __blocking_notifier_call_chain(struct blocking_notifier_head *nh, * racy then it does not matter what the result of the test * is, we re-check the list after having taken the lock anyway: */ - if (rcu_dereference_raw(nh->head)) { + if (rcu_access_pointer(nh->head)) { down_read(&nh->rwsem); ret = notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls); diff --git a/kernel/rcu/Makefile b/kernel/rcu/Makefile index 01e9ec37a3e3..807ccfbf69b3 100644 --- a/kernel/rcu/Makefile +++ b/kernel/rcu/Makefile @@ -1,5 +1,5 @@ obj-y += update.o srcu.o -obj-$(CONFIG_RCU_TORTURE_TEST) += torture.o +obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o obj-$(CONFIG_TREE_RCU) += tree.o obj-$(CONFIG_TREE_PREEMPT_RCU) += tree.o obj-$(CONFIG_TREE_RCU_TRACE) += tree_trace.o diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h index 79c3877e9c5b..bfda2726ca45 100644 --- a/kernel/rcu/rcu.h +++ b/kernel/rcu/rcu.h @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright IBM Corporation, 2011 * @@ -23,6 +23,7 @@ #ifndef __LINUX_RCU_H #define __LINUX_RCU_H +#include <trace/events/rcu.h> #ifdef CONFIG_RCU_TRACE #define RCU_TRACE(stmt) stmt #else /* #ifdef CONFIG_RCU_TRACE */ @@ -116,8 +117,6 @@ static inline bool __rcu_reclaim(const char *rn, struct rcu_head *head) } } -extern int rcu_expedited; - #ifdef CONFIG_RCU_STALL_COMMON extern int rcu_cpu_stall_suppress; diff --git a/kernel/rcu/torture.c b/kernel/rcu/rcutorture.c index 732f8ae3086a..f59d48597dde 100644 --- a/kernel/rcu/torture.c +++ b/kernel/rcu/rcutorture.c @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright (C) IBM Corporation, 2005, 2006 * @@ -48,110 +48,58 @@ #include <linux/slab.h> #include <linux/trace_clock.h> #include <asm/byteorder.h> +#include <linux/torture.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@freedesktop.org>"); -MODULE_ALIAS("rcutorture"); -#ifdef MODULE_PARAM_PREFIX -#undef MODULE_PARAM_PREFIX -#endif -#define MODULE_PARAM_PREFIX "rcutorture." - -static int fqs_duration; -module_param(fqs_duration, int, 0444); -MODULE_PARM_DESC(fqs_duration, "Duration of fqs bursts (us), 0 to disable"); -static int fqs_holdoff; -module_param(fqs_holdoff, int, 0444); -MODULE_PARM_DESC(fqs_holdoff, "Holdoff time within fqs bursts (us)"); -static int fqs_stutter = 3; -module_param(fqs_stutter, int, 0444); -MODULE_PARM_DESC(fqs_stutter, "Wait time between fqs bursts (s)"); -static bool gp_exp; -module_param(gp_exp, bool, 0444); -MODULE_PARM_DESC(gp_exp, "Use expedited GP wait primitives"); -static bool gp_normal; -module_param(gp_normal, bool, 0444); -MODULE_PARM_DESC(gp_normal, "Use normal (non-expedited) GP wait primitives"); -static int irqreader = 1; -module_param(irqreader, int, 0444); -MODULE_PARM_DESC(irqreader, "Allow RCU readers from irq handlers"); -static int n_barrier_cbs; -module_param(n_barrier_cbs, int, 0444); -MODULE_PARM_DESC(n_barrier_cbs, "# of callbacks/kthreads for barrier testing"); -static int nfakewriters = 4; -module_param(nfakewriters, int, 0444); -MODULE_PARM_DESC(nfakewriters, "Number of RCU fake writer threads"); -static int nreaders = -1; -module_param(nreaders, int, 0444); -MODULE_PARM_DESC(nreaders, "Number of RCU reader threads"); -static int object_debug; -module_param(object_debug, int, 0444); -MODULE_PARM_DESC(object_debug, "Enable debug-object double call_rcu() testing"); -static int onoff_holdoff; -module_param(onoff_holdoff, int, 0444); -MODULE_PARM_DESC(onoff_holdoff, "Time after boot before CPU hotplugs (s)"); -static int onoff_interval; -module_param(onoff_interval, int, 0444); -MODULE_PARM_DESC(onoff_interval, "Time between CPU hotplugs (s), 0=disable"); -static int shuffle_interval = 3; -module_param(shuffle_interval, int, 0444); -MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles"); -static int shutdown_secs; -module_param(shutdown_secs, int, 0444); -MODULE_PARM_DESC(shutdown_secs, "Shutdown time (s), <= zero to disable."); -static int stall_cpu; -module_param(stall_cpu, int, 0444); -MODULE_PARM_DESC(stall_cpu, "Stall duration (s), zero to disable."); -static int stall_cpu_holdoff = 10; -module_param(stall_cpu_holdoff, int, 0444); -MODULE_PARM_DESC(stall_cpu_holdoff, "Time to wait before starting stall (s)."); -static int stat_interval = 60; -module_param(stat_interval, int, 0644); -MODULE_PARM_DESC(stat_interval, "Number of seconds between stats printk()s"); -static int stutter = 5; -module_param(stutter, int, 0444); -MODULE_PARM_DESC(stutter, "Number of seconds to run/halt test"); -static int test_boost = 1; -module_param(test_boost, int, 0444); -MODULE_PARM_DESC(test_boost, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); -static int test_boost_duration = 4; -module_param(test_boost_duration, int, 0444); -MODULE_PARM_DESC(test_boost_duration, "Duration of each boost test, seconds."); -static int test_boost_interval = 7; -module_param(test_boost_interval, int, 0444); -MODULE_PARM_DESC(test_boost_interval, "Interval between boost tests, seconds."); -static bool test_no_idle_hz = true; -module_param(test_no_idle_hz, bool, 0444); -MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs"); + +torture_param(int, fqs_duration, 0, + "Duration of fqs bursts (us), 0 to disable"); +torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)"); +torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)"); +torture_param(bool, gp_exp, false, "Use expedited GP wait primitives"); +torture_param(bool, gp_normal, false, + "Use normal (non-expedited) GP wait primitives"); +torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers"); +torture_param(int, n_barrier_cbs, 0, + "# of callbacks/kthreads for barrier testing"); +torture_param(int, nfakewriters, 4, "Number of RCU fake writer threads"); +torture_param(int, nreaders, -1, "Number of RCU reader threads"); +torture_param(int, object_debug, 0, + "Enable debug-object double call_rcu() testing"); +torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); +torture_param(int, onoff_interval, 0, + "Time between CPU hotplugs (s), 0=disable"); +torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles"); +torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); +torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable."); +torture_param(int, stall_cpu_holdoff, 10, + "Time to wait before starting stall (s)."); +torture_param(int, stat_interval, 60, + "Number of seconds between stats printk()s"); +torture_param(int, stutter, 5, "Number of seconds to run/halt test"); +torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); +torture_param(int, test_boost_duration, 4, + "Duration of each boost test, seconds."); +torture_param(int, test_boost_interval, 7, + "Interval between boost tests, seconds."); +torture_param(bool, test_no_idle_hz, true, + "Test support for tickless idle CPUs"); +torture_param(bool, verbose, true, + "Enable verbose debugging printk()s"); + static char *torture_type = "rcu"; module_param(torture_type, charp, 0444); MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, ...)"); -static bool verbose; -module_param(verbose, bool, 0444); -MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); - -#define TORTURE_FLAG "-torture:" -#define PRINTK_STRING(s) \ - do { pr_alert("%s" TORTURE_FLAG s "\n", torture_type); } while (0) -#define VERBOSE_PRINTK_STRING(s) \ - do { if (verbose) pr_alert("%s" TORTURE_FLAG s "\n", torture_type); } while (0) -#define VERBOSE_PRINTK_ERRSTRING(s) \ - do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! " s "\n", torture_type); } while (0) static int nrealreaders; static struct task_struct *writer_task; static struct task_struct **fakewriter_tasks; static struct task_struct **reader_tasks; static struct task_struct *stats_task; -static struct task_struct *shuffler_task; -static struct task_struct *stutter_task; static struct task_struct *fqs_task; static struct task_struct *boost_tasks[NR_CPUS]; -static struct task_struct *shutdown_task; -#ifdef CONFIG_HOTPLUG_CPU -static struct task_struct *onoff_task; -#endif /* #ifdef CONFIG_HOTPLUG_CPU */ static struct task_struct *stall_task; static struct task_struct **barrier_cbs_tasks; static struct task_struct *barrier_task; @@ -170,10 +118,10 @@ static struct rcu_torture __rcu *rcu_torture_current; static unsigned long rcu_torture_current_version; static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; static DEFINE_SPINLOCK(rcu_torture_lock); -static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count) = - { 0 }; -static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch) = - { 0 }; +static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], + rcu_torture_count) = { 0 }; +static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], + rcu_torture_batch) = { 0 }; static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; static atomic_t n_rcu_torture_alloc; static atomic_t n_rcu_torture_alloc_fail; @@ -186,22 +134,9 @@ static long n_rcu_torture_boost_rterror; static long n_rcu_torture_boost_failure; static long n_rcu_torture_boosts; static long n_rcu_torture_timers; -static long n_offline_attempts; -static long n_offline_successes; -static unsigned long sum_offline; -static int min_offline = -1; -static int max_offline; -static long n_online_attempts; -static long n_online_successes; -static unsigned long sum_online; -static int min_online = -1; -static int max_online; static long n_barrier_attempts; static long n_barrier_successes; static struct list_head rcu_torture_removed; -static cpumask_var_t shuffle_tmp_mask; - -static int stutter_pause_test; #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) #define RCUTORTURE_RUNNABLE_INIT 1 @@ -232,7 +167,6 @@ static u64 notrace rcu_trace_clock_local(void) } #endif /* #else #ifdef CONFIG_RCU_TRACE */ -static unsigned long shutdown_time; /* jiffies to system shutdown. */ static unsigned long boost_starttime; /* jiffies of next boost test start. */ DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ /* and boost task create/destroy. */ @@ -242,51 +176,6 @@ static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); -/* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */ - -#define FULLSTOP_DONTSTOP 0 /* Normal operation. */ -#define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */ -#define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */ -static int fullstop = FULLSTOP_RMMOD; -/* - * Protect fullstop transitions and spawning of kthreads. - */ -static DEFINE_MUTEX(fullstop_mutex); - -/* Forward reference. */ -static void rcu_torture_cleanup(void); - -/* - * Detect and respond to a system shutdown. - */ -static int -rcutorture_shutdown_notify(struct notifier_block *unused1, - unsigned long unused2, void *unused3) -{ - mutex_lock(&fullstop_mutex); - if (fullstop == FULLSTOP_DONTSTOP) - fullstop = FULLSTOP_SHUTDOWN; - else - pr_warn(/* but going down anyway, so... */ - "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); - mutex_unlock(&fullstop_mutex); - return NOTIFY_DONE; -} - -/* - * Absorb kthreads into a kernel function that won't return, so that - * they won't ever access module text or data again. - */ -static void rcutorture_shutdown_absorb(const char *title) -{ - if (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { - pr_notice( - "rcutorture thread %s parking due to system shutdown\n", - title); - schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT); - } -} - /* * Allocate an element from the rcu_tortures pool. */ @@ -320,44 +209,6 @@ rcu_torture_free(struct rcu_torture *p) spin_unlock_bh(&rcu_torture_lock); } -struct rcu_random_state { - unsigned long rrs_state; - long rrs_count; -}; - -#define RCU_RANDOM_MULT 39916801 /* prime */ -#define RCU_RANDOM_ADD 479001701 /* prime */ -#define RCU_RANDOM_REFRESH 10000 - -#define DEFINE_RCU_RANDOM(name) struct rcu_random_state name = { 0, 0 } - -/* - * Crude but fast random-number generator. Uses a linear congruential - * generator, with occasional help from cpu_clock(). - */ -static unsigned long -rcu_random(struct rcu_random_state *rrsp) -{ - if (--rrsp->rrs_count < 0) { - rrsp->rrs_state += (unsigned long)local_clock(); - rrsp->rrs_count = RCU_RANDOM_REFRESH; - } - rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD; - return swahw32(rrsp->rrs_state); -} - -static void -rcu_stutter_wait(const char *title) -{ - while (stutter_pause_test || !rcutorture_runnable) { - if (rcutorture_runnable) - schedule_timeout_interruptible(1); - else - schedule_timeout_interruptible(round_jiffies_relative(HZ)); - rcutorture_shutdown_absorb(title); - } -} - /* * Operations vector for selecting different types of tests. */ @@ -365,7 +216,7 @@ rcu_stutter_wait(const char *title) struct rcu_torture_ops { void (*init)(void); int (*readlock)(void); - void (*read_delay)(struct rcu_random_state *rrsp); + void (*read_delay)(struct torture_random_state *rrsp); void (*readunlock)(int idx); int (*completed)(void); void (*deferred_free)(struct rcu_torture *p); @@ -392,7 +243,7 @@ static int rcu_torture_read_lock(void) __acquires(RCU) return 0; } -static void rcu_read_delay(struct rcu_random_state *rrsp) +static void rcu_read_delay(struct torture_random_state *rrsp) { const unsigned long shortdelay_us = 200; const unsigned long longdelay_ms = 50; @@ -401,12 +252,13 @@ static void rcu_read_delay(struct rcu_random_state *rrsp) * period, and we want a long delay occasionally to trigger * force_quiescent_state. */ - if (!(rcu_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) + if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) mdelay(longdelay_ms); - if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) + if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) udelay(shortdelay_us); #ifdef CONFIG_PREEMPT - if (!preempt_count() && !(rcu_random(rrsp) % (nrealreaders * 20000))) + if (!preempt_count() && + !(torture_random(rrsp) % (nrealreaders * 20000))) preempt_schedule(); /* No QS if preempt_disable() in effect */ #endif } @@ -427,7 +279,7 @@ rcu_torture_cb(struct rcu_head *p) int i; struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); - if (fullstop != FULLSTOP_DONTSTOP) { + if (torture_must_stop_irq()) { /* Test is ending, just drop callbacks on the floor. */ /* The next initialization will pick up the pieces. */ return; @@ -520,6 +372,48 @@ static struct rcu_torture_ops rcu_bh_ops = { }; /* + * Don't even think about trying any of these in real life!!! + * The names includes "busted", and they really means it! + * The only purpose of these functions is to provide a buggy RCU + * implementation to make sure that rcutorture correctly emits + * buggy-RCU error messages. + */ +static void rcu_busted_torture_deferred_free(struct rcu_torture *p) +{ + /* This is a deliberate bug for testing purposes only! */ + rcu_torture_cb(&p->rtort_rcu); +} + +static void synchronize_rcu_busted(void) +{ + /* This is a deliberate bug for testing purposes only! */ +} + +static void +call_rcu_busted(struct rcu_head *head, void (*func)(struct rcu_head *rcu)) +{ + /* This is a deliberate bug for testing purposes only! */ + func(head); +} + +static struct rcu_torture_ops rcu_busted_ops = { + .init = rcu_sync_torture_init, + .readlock = rcu_torture_read_lock, + .read_delay = rcu_read_delay, /* just reuse rcu's version. */ + .readunlock = rcu_torture_read_unlock, + .completed = rcu_no_completed, + .deferred_free = rcu_busted_torture_deferred_free, + .sync = synchronize_rcu_busted, + .exp_sync = synchronize_rcu_busted, + .call = call_rcu_busted, + .cb_barrier = NULL, + .fqs = NULL, + .stats = NULL, + .irq_capable = 1, + .name = "rcu_busted" +}; + +/* * Definitions for srcu torture testing. */ @@ -530,7 +424,7 @@ static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) return srcu_read_lock(&srcu_ctl); } -static void srcu_read_delay(struct rcu_random_state *rrsp) +static void srcu_read_delay(struct torture_random_state *rrsp) { long delay; const long uspertick = 1000000 / HZ; @@ -538,7 +432,8 @@ static void srcu_read_delay(struct rcu_random_state *rrsp) /* We want there to be long-running readers, but not all the time. */ - delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick); + delay = torture_random(rrsp) % + (nrealreaders * 2 * longdelay * uspertick); if (!delay) schedule_timeout_interruptible(longdelay); else @@ -677,12 +572,12 @@ static int rcu_torture_boost(void *arg) struct rcu_boost_inflight rbi = { .inflight = 0 }; struct sched_param sp; - VERBOSE_PRINTK_STRING("rcu_torture_boost started"); + VERBOSE_TOROUT_STRING("rcu_torture_boost started"); /* Set real-time priority. */ sp.sched_priority = 1; if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { - VERBOSE_PRINTK_STRING("rcu_torture_boost RT prio failed!"); + VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); n_rcu_torture_boost_rterror++; } @@ -693,9 +588,8 @@ static int rcu_torture_boost(void *arg) oldstarttime = boost_starttime; while (ULONG_CMP_LT(jiffies, oldstarttime)) { schedule_timeout_interruptible(oldstarttime - jiffies); - rcu_stutter_wait("rcu_torture_boost"); - if (kthread_should_stop() || - fullstop != FULLSTOP_DONTSTOP) + stutter_wait("rcu_torture_boost"); + if (torture_must_stop()) goto checkwait; } @@ -710,15 +604,14 @@ static int rcu_torture_boost(void *arg) call_rcu(&rbi.rcu, rcu_torture_boost_cb); if (jiffies - call_rcu_time > test_boost_duration * HZ - HZ / 2) { - VERBOSE_PRINTK_STRING("rcu_torture_boost boosting failed"); + VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); n_rcu_torture_boost_failure++; } call_rcu_time = jiffies; } cond_resched(); - rcu_stutter_wait("rcu_torture_boost"); - if (kthread_should_stop() || - fullstop != FULLSTOP_DONTSTOP) + stutter_wait("rcu_torture_boost"); + if (torture_must_stop()) goto checkwait; } @@ -742,16 +635,17 @@ static int rcu_torture_boost(void *arg) } /* Go do the stutter. */ -checkwait: rcu_stutter_wait("rcu_torture_boost"); - } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); +checkwait: stutter_wait("rcu_torture_boost"); + } while (!torture_must_stop()); /* Clean up and exit. */ - VERBOSE_PRINTK_STRING("rcu_torture_boost task stopping"); - rcutorture_shutdown_absorb("rcu_torture_boost"); - while (!kthread_should_stop() || rbi.inflight) + while (!kthread_should_stop() || rbi.inflight) { + torture_shutdown_absorb("rcu_torture_boost"); schedule_timeout_uninterruptible(1); + } smp_mb(); /* order accesses to ->inflight before stack-frame death. */ destroy_rcu_head_on_stack(&rbi.rcu); + torture_kthread_stopping("rcu_torture_boost"); return 0; } @@ -766,7 +660,7 @@ rcu_torture_fqs(void *arg) unsigned long fqs_resume_time; int fqs_burst_remaining; - VERBOSE_PRINTK_STRING("rcu_torture_fqs task started"); + VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); do { fqs_resume_time = jiffies + fqs_stutter * HZ; while (ULONG_CMP_LT(jiffies, fqs_resume_time) && @@ -780,12 +674,9 @@ rcu_torture_fqs(void *arg) udelay(fqs_holdoff); fqs_burst_remaining -= fqs_holdoff; } - rcu_stutter_wait("rcu_torture_fqs"); - } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); - VERBOSE_PRINTK_STRING("rcu_torture_fqs task stopping"); - rcutorture_shutdown_absorb("rcu_torture_fqs"); - while (!kthread_should_stop()) - schedule_timeout_uninterruptible(1); + stutter_wait("rcu_torture_fqs"); + } while (!torture_must_stop()); + torture_kthread_stopping("rcu_torture_fqs"); return 0; } @@ -802,9 +693,9 @@ rcu_torture_writer(void *arg) struct rcu_torture *rp; struct rcu_torture *rp1; struct rcu_torture *old_rp; - static DEFINE_RCU_RANDOM(rand); + static DEFINE_TORTURE_RANDOM(rand); - VERBOSE_PRINTK_STRING("rcu_torture_writer task started"); + VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); set_user_nice(current, 19); do { @@ -813,7 +704,7 @@ rcu_torture_writer(void *arg) if (rp == NULL) continue; rp->rtort_pipe_count = 0; - udelay(rcu_random(&rand) & 0x3ff); + udelay(torture_random(&rand) & 0x3ff); old_rp = rcu_dereference_check(rcu_torture_current, current == writer_task); rp->rtort_mbtest = 1; @@ -826,7 +717,7 @@ rcu_torture_writer(void *arg) atomic_inc(&rcu_torture_wcount[i]); old_rp->rtort_pipe_count++; if (gp_normal == gp_exp) - exp = !!(rcu_random(&rand) & 0x80); + exp = !!(torture_random(&rand) & 0x80); else exp = gp_exp; if (!exp) { @@ -852,12 +743,9 @@ rcu_torture_writer(void *arg) } } rcutorture_record_progress(++rcu_torture_current_version); - rcu_stutter_wait("rcu_torture_writer"); - } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); - VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping"); - rcutorture_shutdown_absorb("rcu_torture_writer"); - while (!kthread_should_stop()) - schedule_timeout_uninterruptible(1); + stutter_wait("rcu_torture_writer"); + } while (!torture_must_stop()); + torture_kthread_stopping("rcu_torture_writer"); return 0; } @@ -868,19 +756,19 @@ rcu_torture_writer(void *arg) static int rcu_torture_fakewriter(void *arg) { - DEFINE_RCU_RANDOM(rand); + DEFINE_TORTURE_RANDOM(rand); - VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started"); + VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); set_user_nice(current, 19); do { - schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10); - udelay(rcu_random(&rand) & 0x3ff); + schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); + udelay(torture_random(&rand) & 0x3ff); if (cur_ops->cb_barrier != NULL && - rcu_random(&rand) % (nfakewriters * 8) == 0) { + torture_random(&rand) % (nfakewriters * 8) == 0) { cur_ops->cb_barrier(); } else if (gp_normal == gp_exp) { - if (rcu_random(&rand) & 0x80) + if (torture_random(&rand) & 0x80) cur_ops->sync(); else cur_ops->exp_sync(); @@ -889,13 +777,10 @@ rcu_torture_fakewriter(void *arg) } else { cur_ops->exp_sync(); } - rcu_stutter_wait("rcu_torture_fakewriter"); - } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); + stutter_wait("rcu_torture_fakewriter"); + } while (!torture_must_stop()); - VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); - rcutorture_shutdown_absorb("rcu_torture_fakewriter"); - while (!kthread_should_stop()) - schedule_timeout_uninterruptible(1); + torture_kthread_stopping("rcu_torture_fakewriter"); return 0; } @@ -921,7 +806,7 @@ static void rcu_torture_timer(unsigned long unused) int idx; int completed; int completed_end; - static DEFINE_RCU_RANDOM(rand); + static DEFINE_TORTURE_RANDOM(rand); static DEFINE_SPINLOCK(rand_lock); struct rcu_torture *p; int pipe_count; @@ -980,13 +865,13 @@ rcu_torture_reader(void *arg) int completed; int completed_end; int idx; - DEFINE_RCU_RANDOM(rand); + DEFINE_TORTURE_RANDOM(rand); struct rcu_torture *p; int pipe_count; struct timer_list t; unsigned long long ts; - VERBOSE_PRINTK_STRING("rcu_torture_reader task started"); + VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); set_user_nice(current, 19); if (irqreader && cur_ops->irq_capable) setup_timer_on_stack(&t, rcu_torture_timer, 0); @@ -1034,14 +919,11 @@ rcu_torture_reader(void *arg) preempt_enable(); cur_ops->readunlock(idx); schedule(); - rcu_stutter_wait("rcu_torture_reader"); - } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); - VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping"); - rcutorture_shutdown_absorb("rcu_torture_reader"); + stutter_wait("rcu_torture_reader"); + } while (!torture_must_stop()); if (irqreader && cur_ops->irq_capable) del_timer_sync(&t); - while (!kthread_should_stop()) - schedule_timeout_uninterruptible(1); + torture_kthread_stopping("rcu_torture_reader"); return 0; } @@ -1083,13 +965,7 @@ rcu_torture_printk(char *page) n_rcu_torture_boost_failure, n_rcu_torture_boosts, n_rcu_torture_timers); - page += sprintf(page, - "onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ", - n_online_successes, n_online_attempts, - n_offline_successes, n_offline_attempts, - min_online, max_online, - min_offline, max_offline, - sum_online, sum_offline, HZ); + page = torture_onoff_stats(page); page += sprintf(page, "barrier: %ld/%ld:%ld", n_barrier_successes, n_barrier_attempts, @@ -1150,123 +1026,17 @@ rcu_torture_stats_print(void) /* * Periodically prints torture statistics, if periodic statistics printing * was specified via the stat_interval module parameter. - * - * No need to worry about fullstop here, since this one doesn't reference - * volatile state or register callbacks. */ static int rcu_torture_stats(void *arg) { - VERBOSE_PRINTK_STRING("rcu_torture_stats task started"); + VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); do { schedule_timeout_interruptible(stat_interval * HZ); rcu_torture_stats_print(); - rcutorture_shutdown_absorb("rcu_torture_stats"); - } while (!kthread_should_stop()); - VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping"); - return 0; -} - -static int rcu_idle_cpu; /* Force all torture tasks off this CPU */ - -/* Shuffle tasks such that we allow @rcu_idle_cpu to become idle. A special case - * is when @rcu_idle_cpu = -1, when we allow the tasks to run on all CPUs. - */ -static void rcu_torture_shuffle_tasks(void) -{ - int i; - - cpumask_setall(shuffle_tmp_mask); - get_online_cpus(); - - /* No point in shuffling if there is only one online CPU (ex: UP) */ - if (num_online_cpus() == 1) { - put_online_cpus(); - return; - } - - if (rcu_idle_cpu != -1) - cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask); - - set_cpus_allowed_ptr(current, shuffle_tmp_mask); - - if (reader_tasks) { - for (i = 0; i < nrealreaders; i++) - if (reader_tasks[i]) - set_cpus_allowed_ptr(reader_tasks[i], - shuffle_tmp_mask); - } - if (fakewriter_tasks) { - for (i = 0; i < nfakewriters; i++) - if (fakewriter_tasks[i]) - set_cpus_allowed_ptr(fakewriter_tasks[i], - shuffle_tmp_mask); - } - if (writer_task) - set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask); - if (stats_task) - set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask); - if (stutter_task) - set_cpus_allowed_ptr(stutter_task, shuffle_tmp_mask); - if (fqs_task) - set_cpus_allowed_ptr(fqs_task, shuffle_tmp_mask); - if (shutdown_task) - set_cpus_allowed_ptr(shutdown_task, shuffle_tmp_mask); -#ifdef CONFIG_HOTPLUG_CPU - if (onoff_task) - set_cpus_allowed_ptr(onoff_task, shuffle_tmp_mask); -#endif /* #ifdef CONFIG_HOTPLUG_CPU */ - if (stall_task) - set_cpus_allowed_ptr(stall_task, shuffle_tmp_mask); - if (barrier_cbs_tasks) - for (i = 0; i < n_barrier_cbs; i++) - if (barrier_cbs_tasks[i]) - set_cpus_allowed_ptr(barrier_cbs_tasks[i], - shuffle_tmp_mask); - if (barrier_task) - set_cpus_allowed_ptr(barrier_task, shuffle_tmp_mask); - - if (rcu_idle_cpu == -1) - rcu_idle_cpu = num_online_cpus() - 1; - else - rcu_idle_cpu--; - - put_online_cpus(); -} - -/* Shuffle tasks across CPUs, with the intent of allowing each CPU in the - * system to become idle at a time and cut off its timer ticks. This is meant - * to test the support for such tickless idle CPU in RCU. - */ -static int -rcu_torture_shuffle(void *arg) -{ - VERBOSE_PRINTK_STRING("rcu_torture_shuffle task started"); - do { - schedule_timeout_interruptible(shuffle_interval * HZ); - rcu_torture_shuffle_tasks(); - rcutorture_shutdown_absorb("rcu_torture_shuffle"); - } while (!kthread_should_stop()); - VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping"); - return 0; -} - -/* Cause the rcutorture test to "stutter", starting and stopping all - * threads periodically. - */ -static int -rcu_torture_stutter(void *arg) -{ - VERBOSE_PRINTK_STRING("rcu_torture_stutter task started"); - do { - schedule_timeout_interruptible(stutter * HZ); - stutter_pause_test = 1; - if (!kthread_should_stop()) - schedule_timeout_interruptible(stutter * HZ); - stutter_pause_test = 0; - rcutorture_shutdown_absorb("rcu_torture_stutter"); - } while (!kthread_should_stop()); - VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping"); + torture_shutdown_absorb("rcu_torture_stats"); + } while (!torture_must_stop()); + torture_kthread_stopping("rcu_torture_stats"); return 0; } @@ -1293,10 +1063,6 @@ rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) onoff_interval, onoff_holdoff); } -static struct notifier_block rcutorture_shutdown_nb = { - .notifier_call = rcutorture_shutdown_notify, -}; - static void rcutorture_booster_cleanup(int cpu) { struct task_struct *t; @@ -1304,14 +1070,12 @@ static void rcutorture_booster_cleanup(int cpu) if (boost_tasks[cpu] == NULL) return; mutex_lock(&boost_mutex); - VERBOSE_PRINTK_STRING("Stopping rcu_torture_boost task"); t = boost_tasks[cpu]; boost_tasks[cpu] = NULL; mutex_unlock(&boost_mutex); /* This must be outside of the mutex, otherwise deadlock! */ - kthread_stop(t); - boost_tasks[cpu] = NULL; + torture_stop_kthread(rcu_torture_boost, t); } static int rcutorture_booster_init(int cpu) @@ -1323,13 +1087,13 @@ static int rcutorture_booster_init(int cpu) /* Don't allow time recalculation while creating a new task. */ mutex_lock(&boost_mutex); - VERBOSE_PRINTK_STRING("Creating rcu_torture_boost task"); + VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, cpu_to_node(cpu), "rcu_torture_boost"); if (IS_ERR(boost_tasks[cpu])) { retval = PTR_ERR(boost_tasks[cpu]); - VERBOSE_PRINTK_STRING("rcu_torture_boost task create failed"); + VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); n_rcu_torture_boost_ktrerror++; boost_tasks[cpu] = NULL; mutex_unlock(&boost_mutex); @@ -1342,175 +1106,6 @@ static int rcutorture_booster_init(int cpu) } /* - * Cause the rcutorture test to shutdown the system after the test has - * run for the time specified by the shutdown_secs module parameter. - */ -static int -rcu_torture_shutdown(void *arg) -{ - long delta; - unsigned long jiffies_snap; - - VERBOSE_PRINTK_STRING("rcu_torture_shutdown task started"); - jiffies_snap = ACCESS_ONCE(jiffies); - while (ULONG_CMP_LT(jiffies_snap, shutdown_time) && - !kthread_should_stop()) { - delta = shutdown_time - jiffies_snap; - if (verbose) - pr_alert("%s" TORTURE_FLAG - "rcu_torture_shutdown task: %lu jiffies remaining\n", - torture_type, delta); - schedule_timeout_interruptible(delta); - jiffies_snap = ACCESS_ONCE(jiffies); - } - if (kthread_should_stop()) { - VERBOSE_PRINTK_STRING("rcu_torture_shutdown task stopping"); - return 0; - } - - /* OK, shut down the system. */ - - VERBOSE_PRINTK_STRING("rcu_torture_shutdown task shutting down system"); - shutdown_task = NULL; /* Avoid self-kill deadlock. */ - rcu_torture_cleanup(); /* Get the success/failure message. */ - kernel_power_off(); /* Shut down the system. */ - return 0; -} - -#ifdef CONFIG_HOTPLUG_CPU - -/* - * Execute random CPU-hotplug operations at the interval specified - * by the onoff_interval. - */ -static int -rcu_torture_onoff(void *arg) -{ - int cpu; - unsigned long delta; - int maxcpu = -1; - DEFINE_RCU_RANDOM(rand); - int ret; - unsigned long starttime; - - VERBOSE_PRINTK_STRING("rcu_torture_onoff task started"); - for_each_online_cpu(cpu) - maxcpu = cpu; - WARN_ON(maxcpu < 0); - if (onoff_holdoff > 0) { - VERBOSE_PRINTK_STRING("rcu_torture_onoff begin holdoff"); - schedule_timeout_interruptible(onoff_holdoff * HZ); - VERBOSE_PRINTK_STRING("rcu_torture_onoff end holdoff"); - } - while (!kthread_should_stop()) { - cpu = (rcu_random(&rand) >> 4) % (maxcpu + 1); - if (cpu_online(cpu) && cpu_is_hotpluggable(cpu)) { - if (verbose) - pr_alert("%s" TORTURE_FLAG - "rcu_torture_onoff task: offlining %d\n", - torture_type, cpu); - starttime = jiffies; - n_offline_attempts++; - ret = cpu_down(cpu); - if (ret) { - if (verbose) - pr_alert("%s" TORTURE_FLAG - "rcu_torture_onoff task: offline %d failed: errno %d\n", - torture_type, cpu, ret); - } else { - if (verbose) - pr_alert("%s" TORTURE_FLAG - "rcu_torture_onoff task: offlined %d\n", - torture_type, cpu); - n_offline_successes++; - delta = jiffies - starttime; - sum_offline += delta; - if (min_offline < 0) { - min_offline = delta; - max_offline = delta; - } - if (min_offline > delta) - min_offline = delta; - if (max_offline < delta) - max_offline = delta; - } - } else if (cpu_is_hotpluggable(cpu)) { - if (verbose) - pr_alert("%s" TORTURE_FLAG - "rcu_torture_onoff task: onlining %d\n", - torture_type, cpu); - starttime = jiffies; - n_online_attempts++; - ret = cpu_up(cpu); - if (ret) { - if (verbose) - pr_alert("%s" TORTURE_FLAG - "rcu_torture_onoff task: online %d failed: errno %d\n", - torture_type, cpu, ret); - } else { - if (verbose) - pr_alert("%s" TORTURE_FLAG - "rcu_torture_onoff task: onlined %d\n", - torture_type, cpu); - n_online_successes++; - delta = jiffies - starttime; - sum_online += delta; - if (min_online < 0) { - min_online = delta; - max_online = delta; - } - if (min_online > delta) - min_online = delta; - if (max_online < delta) - max_online = delta; - } - } - schedule_timeout_interruptible(onoff_interval * HZ); - } - VERBOSE_PRINTK_STRING("rcu_torture_onoff task stopping"); - return 0; -} - -static int -rcu_torture_onoff_init(void) -{ - int ret; - - if (onoff_interval <= 0) - return 0; - onoff_task = kthread_run(rcu_torture_onoff, NULL, "rcu_torture_onoff"); - if (IS_ERR(onoff_task)) { - ret = PTR_ERR(onoff_task); - onoff_task = NULL; - return ret; - } - return 0; -} - -static void rcu_torture_onoff_cleanup(void) -{ - if (onoff_task == NULL) - return; - VERBOSE_PRINTK_STRING("Stopping rcu_torture_onoff task"); - kthread_stop(onoff_task); - onoff_task = NULL; -} - -#else /* #ifdef CONFIG_HOTPLUG_CPU */ - -static int -rcu_torture_onoff_init(void) -{ - return 0; -} - -static void rcu_torture_onoff_cleanup(void) -{ -} - -#endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ - -/* * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then * induces a CPU stall for the time specified by stall_cpu. */ @@ -1518,11 +1113,11 @@ static int rcu_torture_stall(void *args) { unsigned long stop_at; - VERBOSE_PRINTK_STRING("rcu_torture_stall task started"); + VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); if (stall_cpu_holdoff > 0) { - VERBOSE_PRINTK_STRING("rcu_torture_stall begin holdoff"); + VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); schedule_timeout_interruptible(stall_cpu_holdoff * HZ); - VERBOSE_PRINTK_STRING("rcu_torture_stall end holdoff"); + VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); } if (!kthread_should_stop()) { stop_at = get_seconds() + stall_cpu; @@ -1536,7 +1131,7 @@ static int rcu_torture_stall(void *args) rcu_read_unlock(); pr_alert("rcu_torture_stall end.\n"); } - rcutorture_shutdown_absorb("rcu_torture_stall"); + torture_shutdown_absorb("rcu_torture_stall"); while (!kthread_should_stop()) schedule_timeout_interruptible(10 * HZ); return 0; @@ -1545,27 +1140,9 @@ static int rcu_torture_stall(void *args) /* Spawn CPU-stall kthread, if stall_cpu specified. */ static int __init rcu_torture_stall_init(void) { - int ret; - if (stall_cpu <= 0) return 0; - stall_task = kthread_run(rcu_torture_stall, NULL, "rcu_torture_stall"); - if (IS_ERR(stall_task)) { - ret = PTR_ERR(stall_task); - stall_task = NULL; - return ret; - } - return 0; -} - -/* Clean up after the CPU-stall kthread, if one was spawned. */ -static void rcu_torture_stall_cleanup(void) -{ - if (stall_task == NULL) - return; - VERBOSE_PRINTK_STRING("Stopping rcu_torture_stall_task."); - kthread_stop(stall_task); - stall_task = NULL; + return torture_create_kthread(rcu_torture_stall, NULL, stall_task); } /* Callback function for RCU barrier testing. */ @@ -1583,28 +1160,24 @@ static int rcu_torture_barrier_cbs(void *arg) struct rcu_head rcu; init_rcu_head_on_stack(&rcu); - VERBOSE_PRINTK_STRING("rcu_torture_barrier_cbs task started"); + VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); set_user_nice(current, 19); do { wait_event(barrier_cbs_wq[myid], (newphase = ACCESS_ONCE(barrier_phase)) != lastphase || - kthread_should_stop() || - fullstop != FULLSTOP_DONTSTOP); + torture_must_stop()); lastphase = newphase; smp_mb(); /* ensure barrier_phase load before ->call(). */ - if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) + if (torture_must_stop()) break; cur_ops->call(&rcu, rcu_torture_barrier_cbf); if (atomic_dec_and_test(&barrier_cbs_count)) wake_up(&barrier_wq); - } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); - VERBOSE_PRINTK_STRING("rcu_torture_barrier_cbs task stopping"); - rcutorture_shutdown_absorb("rcu_torture_barrier_cbs"); - while (!kthread_should_stop()) - schedule_timeout_interruptible(1); + } while (!torture_must_stop()); cur_ops->cb_barrier(); destroy_rcu_head_on_stack(&rcu); + torture_kthread_stopping("rcu_torture_barrier_cbs"); return 0; } @@ -1613,7 +1186,7 @@ static int rcu_torture_barrier(void *arg) { int i; - VERBOSE_PRINTK_STRING("rcu_torture_barrier task starting"); + VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); do { atomic_set(&barrier_cbs_invoked, 0); atomic_set(&barrier_cbs_count, n_barrier_cbs); @@ -1623,9 +1196,8 @@ static int rcu_torture_barrier(void *arg) wake_up(&barrier_cbs_wq[i]); wait_event(barrier_wq, atomic_read(&barrier_cbs_count) == 0 || - kthread_should_stop() || - fullstop != FULLSTOP_DONTSTOP); - if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) + torture_must_stop()); + if (torture_must_stop()) break; n_barrier_attempts++; cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ @@ -1635,11 +1207,8 @@ static int rcu_torture_barrier(void *arg) } n_barrier_successes++; schedule_timeout_interruptible(HZ / 10); - } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); - VERBOSE_PRINTK_STRING("rcu_torture_barrier task stopping"); - rcutorture_shutdown_absorb("rcu_torture_barrier"); - while (!kthread_should_stop()) - schedule_timeout_interruptible(1); + } while (!torture_must_stop()); + torture_kthread_stopping("rcu_torture_barrier"); return 0; } @@ -1672,24 +1241,13 @@ static int rcu_torture_barrier_init(void) return -ENOMEM; for (i = 0; i < n_barrier_cbs; i++) { init_waitqueue_head(&barrier_cbs_wq[i]); - barrier_cbs_tasks[i] = kthread_run(rcu_torture_barrier_cbs, - (void *)(long)i, - "rcu_torture_barrier_cbs"); - if (IS_ERR(barrier_cbs_tasks[i])) { - ret = PTR_ERR(barrier_cbs_tasks[i]); - VERBOSE_PRINTK_ERRSTRING("Failed to create rcu_torture_barrier_cbs"); - barrier_cbs_tasks[i] = NULL; + ret = torture_create_kthread(rcu_torture_barrier_cbs, + (void *)(long)i, + barrier_cbs_tasks[i]); + if (ret) return ret; - } } - barrier_task = kthread_run(rcu_torture_barrier, NULL, - "rcu_torture_barrier"); - if (IS_ERR(barrier_task)) { - ret = PTR_ERR(barrier_task); - VERBOSE_PRINTK_ERRSTRING("Failed to create rcu_torture_barrier"); - barrier_task = NULL; - } - return 0; + return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task); } /* Clean up after RCU barrier testing. */ @@ -1697,19 +1255,11 @@ static void rcu_torture_barrier_cleanup(void) { int i; - if (barrier_task != NULL) { - VERBOSE_PRINTK_STRING("Stopping rcu_torture_barrier task"); - kthread_stop(barrier_task); - barrier_task = NULL; - } + torture_stop_kthread(rcu_torture_barrier, barrier_task); if (barrier_cbs_tasks != NULL) { - for (i = 0; i < n_barrier_cbs; i++) { - if (barrier_cbs_tasks[i] != NULL) { - VERBOSE_PRINTK_STRING("Stopping rcu_torture_barrier_cbs task"); - kthread_stop(barrier_cbs_tasks[i]); - barrier_cbs_tasks[i] = NULL; - } - } + for (i = 0; i < n_barrier_cbs; i++) + torture_stop_kthread(rcu_torture_barrier_cbs, + barrier_cbs_tasks[i]); kfree(barrier_cbs_tasks); barrier_cbs_tasks = NULL; } @@ -1747,90 +1297,42 @@ rcu_torture_cleanup(void) { int i; - mutex_lock(&fullstop_mutex); rcutorture_record_test_transition(); - if (fullstop == FULLSTOP_SHUTDOWN) { - pr_warn(/* but going down anyway, so... */ - "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); - mutex_unlock(&fullstop_mutex); - schedule_timeout_uninterruptible(10); + if (torture_cleanup()) { if (cur_ops->cb_barrier != NULL) cur_ops->cb_barrier(); return; } - fullstop = FULLSTOP_RMMOD; - mutex_unlock(&fullstop_mutex); - unregister_reboot_notifier(&rcutorture_shutdown_nb); - rcu_torture_barrier_cleanup(); - rcu_torture_stall_cleanup(); - if (stutter_task) { - VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task"); - kthread_stop(stutter_task); - } - stutter_task = NULL; - if (shuffler_task) { - VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task"); - kthread_stop(shuffler_task); - free_cpumask_var(shuffle_tmp_mask); - } - shuffler_task = NULL; - if (writer_task) { - VERBOSE_PRINTK_STRING("Stopping rcu_torture_writer task"); - kthread_stop(writer_task); - } - writer_task = NULL; + rcu_torture_barrier_cleanup(); + torture_stop_kthread(rcu_torture_stall, stall_task); + torture_stop_kthread(rcu_torture_writer, writer_task); if (reader_tasks) { - for (i = 0; i < nrealreaders; i++) { - if (reader_tasks[i]) { - VERBOSE_PRINTK_STRING( - "Stopping rcu_torture_reader task"); - kthread_stop(reader_tasks[i]); - } - reader_tasks[i] = NULL; - } + for (i = 0; i < nrealreaders; i++) + torture_stop_kthread(rcu_torture_reader, + reader_tasks[i]); kfree(reader_tasks); - reader_tasks = NULL; } rcu_torture_current = NULL; if (fakewriter_tasks) { for (i = 0; i < nfakewriters; i++) { - if (fakewriter_tasks[i]) { - VERBOSE_PRINTK_STRING( - "Stopping rcu_torture_fakewriter task"); - kthread_stop(fakewriter_tasks[i]); - } - fakewriter_tasks[i] = NULL; + torture_stop_kthread(rcu_torture_fakewriter, + fakewriter_tasks[i]); } kfree(fakewriter_tasks); fakewriter_tasks = NULL; } - if (stats_task) { - VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); - kthread_stop(stats_task); - } - stats_task = NULL; - - if (fqs_task) { - VERBOSE_PRINTK_STRING("Stopping rcu_torture_fqs task"); - kthread_stop(fqs_task); - } - fqs_task = NULL; + torture_stop_kthread(rcu_torture_stats, stats_task); + torture_stop_kthread(rcu_torture_fqs, fqs_task); if ((test_boost == 1 && cur_ops->can_boost) || test_boost == 2) { unregister_cpu_notifier(&rcutorture_cpu_nb); for_each_possible_cpu(i) rcutorture_booster_cleanup(i); } - if (shutdown_task != NULL) { - VERBOSE_PRINTK_STRING("Stopping rcu_torture_shutdown task"); - kthread_stop(shutdown_task); - } - shutdown_task = NULL; - rcu_torture_onoff_cleanup(); /* Wait for all RCU callbacks to fire. */ @@ -1841,8 +1343,7 @@ rcu_torture_cleanup(void) if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); - else if (n_online_successes != n_online_attempts || - n_offline_successes != n_offline_attempts) + else if (torture_onoff_failures()) rcu_torture_print_module_parms(cur_ops, "End of test: RCU_HOTPLUG"); else @@ -1911,12 +1412,11 @@ rcu_torture_init(void) int i; int cpu; int firsterr = 0; - int retval; static struct rcu_torture_ops *torture_ops[] = { - &rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops, + &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &sched_ops, }; - mutex_lock(&fullstop_mutex); + torture_init_begin(torture_type, verbose, &rcutorture_runnable); /* Process args and tell the world that the torturer is on the job. */ for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { @@ -1931,7 +1431,7 @@ rcu_torture_init(void) for (i = 0; i < ARRAY_SIZE(torture_ops); i++) pr_alert(" %s", torture_ops[i]->name); pr_alert("\n"); - mutex_unlock(&fullstop_mutex); + torture_init_end(); return -EINVAL; } if (cur_ops->fqs == NULL && fqs_duration != 0) { @@ -1946,7 +1446,6 @@ rcu_torture_init(void) else nrealreaders = 2 * num_online_cpus(); rcu_torture_print_module_parms(cur_ops, "Start of test"); - fullstop = FULLSTOP_DONTSTOP; /* Set up the freelist. */ @@ -1982,108 +1481,61 @@ rcu_torture_init(void) /* Start up the kthreads. */ - VERBOSE_PRINTK_STRING("Creating rcu_torture_writer task"); - writer_task = kthread_create(rcu_torture_writer, NULL, - "rcu_torture_writer"); - if (IS_ERR(writer_task)) { - firsterr = PTR_ERR(writer_task); - VERBOSE_PRINTK_ERRSTRING("Failed to create writer"); - writer_task = NULL; + firsterr = torture_create_kthread(rcu_torture_writer, NULL, + writer_task); + if (firsterr) goto unwind; - } - wake_up_process(writer_task); fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), GFP_KERNEL); if (fakewriter_tasks == NULL) { - VERBOSE_PRINTK_ERRSTRING("out of memory"); + VERBOSE_TOROUT_ERRSTRING("out of memory"); firsterr = -ENOMEM; goto unwind; } for (i = 0; i < nfakewriters; i++) { - VERBOSE_PRINTK_STRING("Creating rcu_torture_fakewriter task"); - fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, - "rcu_torture_fakewriter"); - if (IS_ERR(fakewriter_tasks[i])) { - firsterr = PTR_ERR(fakewriter_tasks[i]); - VERBOSE_PRINTK_ERRSTRING("Failed to create fakewriter"); - fakewriter_tasks[i] = NULL; + firsterr = torture_create_kthread(rcu_torture_fakewriter, + NULL, fakewriter_tasks[i]); + if (firsterr) goto unwind; - } } reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), GFP_KERNEL); if (reader_tasks == NULL) { - VERBOSE_PRINTK_ERRSTRING("out of memory"); + VERBOSE_TOROUT_ERRSTRING("out of memory"); firsterr = -ENOMEM; goto unwind; } for (i = 0; i < nrealreaders; i++) { - VERBOSE_PRINTK_STRING("Creating rcu_torture_reader task"); - reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, - "rcu_torture_reader"); - if (IS_ERR(reader_tasks[i])) { - firsterr = PTR_ERR(reader_tasks[i]); - VERBOSE_PRINTK_ERRSTRING("Failed to create reader"); - reader_tasks[i] = NULL; + firsterr = torture_create_kthread(rcu_torture_reader, NULL, + reader_tasks[i]); + if (firsterr) goto unwind; - } } if (stat_interval > 0) { - VERBOSE_PRINTK_STRING("Creating rcu_torture_stats task"); - stats_task = kthread_run(rcu_torture_stats, NULL, - "rcu_torture_stats"); - if (IS_ERR(stats_task)) { - firsterr = PTR_ERR(stats_task); - VERBOSE_PRINTK_ERRSTRING("Failed to create stats"); - stats_task = NULL; + firsterr = torture_create_kthread(rcu_torture_stats, NULL, + stats_task); + if (firsterr) goto unwind; - } } if (test_no_idle_hz) { - rcu_idle_cpu = num_online_cpus() - 1; - - if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { - firsterr = -ENOMEM; - VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask"); - goto unwind; - } - - /* Create the shuffler thread */ - shuffler_task = kthread_run(rcu_torture_shuffle, NULL, - "rcu_torture_shuffle"); - if (IS_ERR(shuffler_task)) { - free_cpumask_var(shuffle_tmp_mask); - firsterr = PTR_ERR(shuffler_task); - VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler"); - shuffler_task = NULL; + firsterr = torture_shuffle_init(shuffle_interval * HZ); + if (firsterr) goto unwind; - } } if (stutter < 0) stutter = 0; if (stutter) { - /* Create the stutter thread */ - stutter_task = kthread_run(rcu_torture_stutter, NULL, - "rcu_torture_stutter"); - if (IS_ERR(stutter_task)) { - firsterr = PTR_ERR(stutter_task); - VERBOSE_PRINTK_ERRSTRING("Failed to create stutter"); - stutter_task = NULL; + firsterr = torture_stutter_init(stutter * HZ); + if (firsterr) goto unwind; - } } if (fqs_duration < 0) fqs_duration = 0; if (fqs_duration) { - /* Create the stutter thread */ - fqs_task = kthread_run(rcu_torture_fqs, NULL, - "rcu_torture_fqs"); - if (IS_ERR(fqs_task)) { - firsterr = PTR_ERR(fqs_task); - VERBOSE_PRINTK_ERRSTRING("Failed to create fqs"); - fqs_task = NULL; + /* Create the fqs thread */ + torture_create_kthread(rcu_torture_fqs, NULL, fqs_task); + if (firsterr) goto unwind; - } } if (test_boost_interval < 1) test_boost_interval = 1; @@ -2097,49 +1549,31 @@ rcu_torture_init(void) for_each_possible_cpu(i) { if (cpu_is_offline(i)) continue; /* Heuristic: CPU can go offline. */ - retval = rcutorture_booster_init(i); - if (retval < 0) { - firsterr = retval; + firsterr = rcutorture_booster_init(i); + if (firsterr) goto unwind; - } } } - if (shutdown_secs > 0) { - shutdown_time = jiffies + shutdown_secs * HZ; - shutdown_task = kthread_create(rcu_torture_shutdown, NULL, - "rcu_torture_shutdown"); - if (IS_ERR(shutdown_task)) { - firsterr = PTR_ERR(shutdown_task); - VERBOSE_PRINTK_ERRSTRING("Failed to create shutdown"); - shutdown_task = NULL; - goto unwind; - } - wake_up_process(shutdown_task); - } - i = rcu_torture_onoff_init(); - if (i != 0) { - firsterr = i; + firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup); + if (firsterr) goto unwind; - } - register_reboot_notifier(&rcutorture_shutdown_nb); - i = rcu_torture_stall_init(); - if (i != 0) { - firsterr = i; + firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ); + if (firsterr) goto unwind; - } - retval = rcu_torture_barrier_init(); - if (retval != 0) { - firsterr = retval; + firsterr = rcu_torture_stall_init(); + if (firsterr) + goto unwind; + firsterr = rcu_torture_barrier_init(); + if (firsterr) goto unwind; - } if (object_debug) rcu_test_debug_objects(); rcutorture_record_test_transition(); - mutex_unlock(&fullstop_mutex); + torture_init_end(); return 0; unwind: - mutex_unlock(&fullstop_mutex); + torture_init_end(); rcu_torture_cleanup(); return firsterr; } diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c index 3318d8284384..c639556f3fa0 100644 --- a/kernel/rcu/srcu.c +++ b/kernel/rcu/srcu.c @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright (C) IBM Corporation, 2006 * Copyright (C) Fujitsu, 2012 @@ -36,8 +36,6 @@ #include <linux/delay.h> #include <linux/srcu.h> -#include <trace/events/rcu.h> - #include "rcu.h" /* @@ -398,7 +396,7 @@ void call_srcu(struct srcu_struct *sp, struct rcu_head *head, rcu_batch_queue(&sp->batch_queue, head); if (!sp->running) { sp->running = true; - schedule_delayed_work(&sp->work, 0); + queue_delayed_work(system_power_efficient_wq, &sp->work, 0); } spin_unlock_irqrestore(&sp->queue_lock, flags); } @@ -674,7 +672,8 @@ static void srcu_reschedule(struct srcu_struct *sp) } if (pending) - schedule_delayed_work(&sp->work, SRCU_INTERVAL); + queue_delayed_work(system_power_efficient_wq, + &sp->work, SRCU_INTERVAL); } /* diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c index 1254f312d024..d9efcc13008c 100644 --- a/kernel/rcu/tiny.c +++ b/kernel/rcu/tiny.c @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright IBM Corporation, 2008 * @@ -37,10 +37,6 @@ #include <linux/prefetch.h> #include <linux/ftrace_event.h> -#ifdef CONFIG_RCU_TRACE -#include <trace/events/rcu.h> -#endif /* #else #ifdef CONFIG_RCU_TRACE */ - #include "rcu.h" /* Forward declarations for tiny_plugin.h. */ diff --git a/kernel/rcu/tiny_plugin.h b/kernel/rcu/tiny_plugin.h index 280d06cae352..431528520562 100644 --- a/kernel/rcu/tiny_plugin.h +++ b/kernel/rcu/tiny_plugin.h @@ -14,8 +14,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright (c) 2010 Linaro * diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index b3d116cd072d..0c47e300210a 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright IBM Corporation, 2008 * @@ -58,8 +58,6 @@ #include <linux/suspend.h> #include "tree.h" -#include <trace/events/rcu.h> - #include "rcu.h" MODULE_ALIAS("rcutree"); @@ -837,7 +835,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp, * to the next. Only do this for the primary flavor of RCU. */ if (rdp->rsp == rcu_state && - ULONG_CMP_GE(ACCESS_ONCE(jiffies), rdp->rsp->jiffies_resched)) { + ULONG_CMP_GE(jiffies, rdp->rsp->jiffies_resched)) { rdp->rsp->jiffies_resched += 5; resched_cpu(rdp->cpu); } @@ -847,7 +845,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp, static void record_gp_stall_check_time(struct rcu_state *rsp) { - unsigned long j = ACCESS_ONCE(jiffies); + unsigned long j = jiffies; unsigned long j1; rsp->gp_start = j; @@ -1005,7 +1003,7 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp) if (rcu_cpu_stall_suppress || !rcu_gp_in_progress(rsp)) return; - j = ACCESS_ONCE(jiffies); + j = jiffies; /* * Lots of memory barriers to reject false positives. @@ -1423,13 +1421,14 @@ static int rcu_gp_init(struct rcu_state *rsp) /* Advance to a new grace period and initialize state. */ record_gp_stall_check_time(rsp); - smp_wmb(); /* Record GP times before starting GP. */ - rsp->gpnum++; + /* Record GP times before starting GP, hence smp_store_release(). */ + smp_store_release(&rsp->gpnum, rsp->gpnum + 1); trace_rcu_grace_period(rsp->name, rsp->gpnum, TPS("start")); raw_spin_unlock_irq(&rnp->lock); /* Exclude any concurrent CPU-hotplug operations. */ mutex_lock(&rsp->onoff_mutex); + smp_mb__after_unlock_lock(); /* ->gpnum increment before GP! */ /* * Set the quiescent-state-needed bits in all the rcu_node @@ -1557,10 +1556,11 @@ static void rcu_gp_cleanup(struct rcu_state *rsp) } rnp = rcu_get_root(rsp); raw_spin_lock_irq(&rnp->lock); - smp_mb__after_unlock_lock(); + smp_mb__after_unlock_lock(); /* Order GP before ->completed update. */ rcu_nocb_gp_set(rnp, nocb); - rsp->completed = rsp->gpnum; /* Declare grace period done. */ + /* Declare grace period done. */ + ACCESS_ONCE(rsp->completed) = rsp->gpnum; trace_rcu_grace_period(rsp->name, rsp->completed, TPS("end")); rsp->fqs_state = RCU_GP_IDLE; rdp = this_cpu_ptr(rsp->rda); @@ -2304,7 +2304,7 @@ static void force_quiescent_state(struct rcu_state *rsp) if (rnp_old != NULL) raw_spin_unlock(&rnp_old->fqslock); if (ret) { - rsp->n_force_qs_lh++; + ACCESS_ONCE(rsp->n_force_qs_lh)++; return; } rnp_old = rnp; @@ -2316,7 +2316,7 @@ static void force_quiescent_state(struct rcu_state *rsp) smp_mb__after_unlock_lock(); raw_spin_unlock(&rnp_old->fqslock); if (ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) { - rsp->n_force_qs_lh++; + ACCESS_ONCE(rsp->n_force_qs_lh)++; raw_spin_unlock_irqrestore(&rnp_old->lock, flags); return; /* Someone beat us to it. */ } @@ -2639,6 +2639,58 @@ void synchronize_rcu_bh(void) } EXPORT_SYMBOL_GPL(synchronize_rcu_bh); +/** + * get_state_synchronize_rcu - Snapshot current RCU state + * + * Returns a cookie that is used by a later call to cond_synchronize_rcu() + * to determine whether or not a full grace period has elapsed in the + * meantime. + */ +unsigned long get_state_synchronize_rcu(void) +{ + /* + * Any prior manipulation of RCU-protected data must happen + * before the load from ->gpnum. + */ + smp_mb(); /* ^^^ */ + + /* + * Make sure this load happens before the purportedly + * time-consuming work between get_state_synchronize_rcu() + * and cond_synchronize_rcu(). + */ + return smp_load_acquire(&rcu_state->gpnum); +} +EXPORT_SYMBOL_GPL(get_state_synchronize_rcu); + +/** + * cond_synchronize_rcu - Conditionally wait for an RCU grace period + * + * @oldstate: return value from earlier call to get_state_synchronize_rcu() + * + * If a full RCU grace period has elapsed since the earlier call to + * get_state_synchronize_rcu(), just return. Otherwise, invoke + * synchronize_rcu() to wait for a full grace period. + * + * Yes, this function does not take counter wrap into account. But + * counter wrap is harmless. If the counter wraps, we have waited for + * more than 2 billion grace periods (and way more on a 64-bit system!), + * so waiting for one additional grace period should be just fine. + */ +void cond_synchronize_rcu(unsigned long oldstate) +{ + unsigned long newstate; + + /* + * Ensure that this load happens before any RCU-destructive + * actions the caller might carry out after we return. + */ + newstate = smp_load_acquire(&rcu_state->completed); + if (ULONG_CMP_GE(oldstate, newstate)) + synchronize_rcu(); +} +EXPORT_SYMBOL_GPL(cond_synchronize_rcu); + static int synchronize_sched_expedited_cpu_stop(void *data) { /* @@ -2880,7 +2932,7 @@ static int rcu_pending(int cpu) * non-NULL, store an indication of whether all callbacks are lazy. * (If there are no callbacks, all of them are deemed to be lazy.) */ -static int rcu_cpu_has_callbacks(int cpu, bool *all_lazy) +static int __maybe_unused rcu_cpu_has_callbacks(int cpu, bool *all_lazy) { bool al = true; bool hc = false; diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 8c19873f1ac9..75dc3c39a02a 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -13,8 +13,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright IBM Corporation, 2008 * diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 6e2ef4b2b920..962d1d589929 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -14,8 +14,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright Red Hat, 2009 * Copyright IBM Corporation, 2009 @@ -1586,11 +1586,13 @@ static void rcu_prepare_kthreads(int cpu) * Because we not have RCU_FAST_NO_HZ, just check whether this CPU needs * any flavor of RCU. */ +#ifndef CONFIG_RCU_NOCB_CPU_ALL int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies) { *delta_jiffies = ULONG_MAX; return rcu_cpu_has_callbacks(cpu, NULL); } +#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ /* * Because we do not have RCU_FAST_NO_HZ, don't bother cleaning up @@ -1656,7 +1658,7 @@ extern int tick_nohz_active; * only if it has been awhile since the last time we did so. Afterwards, * if there are any callbacks ready for immediate invocation, return true. */ -static bool rcu_try_advance_all_cbs(void) +static bool __maybe_unused rcu_try_advance_all_cbs(void) { bool cbs_ready = false; struct rcu_data *rdp; @@ -1696,6 +1698,7 @@ static bool rcu_try_advance_all_cbs(void) * * The caller must have disabled interrupts. */ +#ifndef CONFIG_RCU_NOCB_CPU_ALL int rcu_needs_cpu(int cpu, unsigned long *dj) { struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu); @@ -1726,6 +1729,7 @@ int rcu_needs_cpu(int cpu, unsigned long *dj) } return 0; } +#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ /* * Prepare a CPU for idle from an RCU perspective. The first major task @@ -1739,6 +1743,7 @@ int rcu_needs_cpu(int cpu, unsigned long *dj) */ static void rcu_prepare_for_idle(int cpu) { +#ifndef CONFIG_RCU_NOCB_CPU_ALL struct rcu_data *rdp; struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu); struct rcu_node *rnp; @@ -1790,6 +1795,7 @@ static void rcu_prepare_for_idle(int cpu) rcu_accelerate_cbs(rsp, rnp, rdp); raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */ } +#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ } /* @@ -1799,11 +1805,12 @@ static void rcu_prepare_for_idle(int cpu) */ static void rcu_cleanup_after_idle(int cpu) { - +#ifndef CONFIG_RCU_NOCB_CPU_ALL if (rcu_is_nocb_cpu(cpu)) return; if (rcu_try_advance_all_cbs()) invoke_rcu_core(); +#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ } /* @@ -2101,6 +2108,7 @@ static void rcu_init_one_nocb(struct rcu_node *rnp) init_waitqueue_head(&rnp->nocb_gp_wq[1]); } +#ifndef CONFIG_RCU_NOCB_CPU_ALL /* Is the specified CPU a no-CPUs CPU? */ bool rcu_is_nocb_cpu(int cpu) { @@ -2108,6 +2116,7 @@ bool rcu_is_nocb_cpu(int cpu) return cpumask_test_cpu(cpu, rcu_nocb_mask); return false; } +#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ /* * Enqueue the specified string of rcu_head structures onto the specified @@ -2893,7 +2902,7 @@ static void rcu_sysidle_init_percpu_data(struct rcu_dynticks *rdtp) * CPU unless the grace period has extended for too long. * * This code relies on the fact that all NO_HZ_FULL CPUs are also - * CONFIG_RCU_NOCB_CPUs. + * CONFIG_RCU_NOCB_CPU CPUs. */ static bool rcu_nohz_full_cpu(struct rcu_state *rsp) { diff --git a/kernel/rcu/tree_trace.c b/kernel/rcu/tree_trace.c index 4def475336d4..5cdc62e1beeb 100644 --- a/kernel/rcu/tree_trace.c +++ b/kernel/rcu/tree_trace.c @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright IBM Corporation, 2008 * @@ -273,7 +273,7 @@ static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp) seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n", rsp->n_force_qs, rsp->n_force_qs_ngp, rsp->n_force_qs - rsp->n_force_qs_ngp, - rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen); + ACCESS_ONCE(rsp->n_force_qs_lh), rsp->qlen_lazy, rsp->qlen); for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) { if (rnp->level != level) { seq_puts(m, "\n"); diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index c54609faf233..4c0a9b0af469 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -12,8 +12,8 @@ * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright IBM Corporation, 2001 * @@ -49,7 +49,6 @@ #include <linux/module.h> #define CREATE_TRACE_POINTS -#include <trace/events/rcu.h> #include "rcu.h" diff --git a/kernel/torture.c b/kernel/torture.c new file mode 100644 index 000000000000..acc9afc2f26e --- /dev/null +++ b/kernel/torture.c @@ -0,0 +1,719 @@ +/* + * Common functions for in-kernel torture tests. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. + * + * Copyright (C) IBM Corporation, 2014 + * + * Author: Paul E. McKenney <paulmck@us.ibm.com> + * Based on kernel/rcu/torture.c. + */ +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kthread.h> +#include <linux/err.h> +#include <linux/spinlock.h> +#include <linux/smp.h> +#include <linux/interrupt.h> +#include <linux/sched.h> +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/completion.h> +#include <linux/moduleparam.h> +#include <linux/percpu.h> +#include <linux/notifier.h> +#include <linux/reboot.h> +#include <linux/freezer.h> +#include <linux/cpu.h> +#include <linux/delay.h> +#include <linux/stat.h> +#include <linux/slab.h> +#include <linux/trace_clock.h> +#include <asm/byteorder.h> +#include <linux/torture.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>"); + +static char *torture_type; +static bool verbose; + +/* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */ +#define FULLSTOP_DONTSTOP 0 /* Normal operation. */ +#define FULLSTOP_SHUTDOWN 1 /* System shutdown with torture running. */ +#define FULLSTOP_RMMOD 2 /* Normal rmmod of torture. */ +static int fullstop = FULLSTOP_RMMOD; +static DEFINE_MUTEX(fullstop_mutex); +static int *torture_runnable; + +#ifdef CONFIG_HOTPLUG_CPU + +/* + * Variables for online-offline handling. Only present if CPU hotplug + * is enabled, otherwise does nothing. + */ + +static struct task_struct *onoff_task; +static long onoff_holdoff; +static long onoff_interval; +static long n_offline_attempts; +static long n_offline_successes; +static unsigned long sum_offline; +static int min_offline = -1; +static int max_offline; +static long n_online_attempts; +static long n_online_successes; +static unsigned long sum_online; +static int min_online = -1; +static int max_online; + +/* + * Execute random CPU-hotplug operations at the interval specified + * by the onoff_interval. + */ +static int +torture_onoff(void *arg) +{ + int cpu; + unsigned long delta; + int maxcpu = -1; + DEFINE_TORTURE_RANDOM(rand); + int ret; + unsigned long starttime; + + VERBOSE_TOROUT_STRING("torture_onoff task started"); + for_each_online_cpu(cpu) + maxcpu = cpu; + WARN_ON(maxcpu < 0); + if (onoff_holdoff > 0) { + VERBOSE_TOROUT_STRING("torture_onoff begin holdoff"); + schedule_timeout_interruptible(onoff_holdoff); + VERBOSE_TOROUT_STRING("torture_onoff end holdoff"); + } + while (!torture_must_stop()) { + cpu = (torture_random(&rand) >> 4) % (maxcpu + 1); + if (cpu_online(cpu) && cpu_is_hotpluggable(cpu)) { + if (verbose) + pr_alert("%s" TORTURE_FLAG + "torture_onoff task: offlining %d\n", + torture_type, cpu); + starttime = jiffies; + n_offline_attempts++; + ret = cpu_down(cpu); + if (ret) { + if (verbose) + pr_alert("%s" TORTURE_FLAG + "torture_onoff task: offline %d failed: errno %d\n", + torture_type, cpu, ret); + } else { + if (verbose) + pr_alert("%s" TORTURE_FLAG + "torture_onoff task: offlined %d\n", + torture_type, cpu); + n_offline_successes++; + delta = jiffies - starttime; + sum_offline += delta; + if (min_offline < 0) { + min_offline = delta; + max_offline = delta; + } + if (min_offline > delta) + min_offline = delta; + if (max_offline < delta) + max_offline = delta; + } + } else if (cpu_is_hotpluggable(cpu)) { + if (verbose) + pr_alert("%s" TORTURE_FLAG + "torture_onoff task: onlining %d\n", + torture_type, cpu); + starttime = jiffies; + n_online_attempts++; + ret = cpu_up(cpu); + if (ret) { + if (verbose) + pr_alert("%s" TORTURE_FLAG + "torture_onoff task: online %d failed: errno %d\n", + torture_type, cpu, ret); + } else { + if (verbose) + pr_alert("%s" TORTURE_FLAG + "torture_onoff task: onlined %d\n", + torture_type, cpu); + n_online_successes++; + delta = jiffies - starttime; + sum_online += delta; + if (min_online < 0) { + min_online = delta; + max_online = delta; + } + if (min_online > delta) + min_online = delta; + if (max_online < delta) + max_online = delta; + } + } + schedule_timeout_interruptible(onoff_interval); + } + torture_kthread_stopping("torture_onoff"); + return 0; +} + +#endif /* #ifdef CONFIG_HOTPLUG_CPU */ + +/* + * Initiate online-offline handling. + */ +int torture_onoff_init(long ooholdoff, long oointerval) +{ + int ret = 0; + +#ifdef CONFIG_HOTPLUG_CPU + onoff_holdoff = ooholdoff; + onoff_interval = oointerval; + if (onoff_interval <= 0) + return 0; + ret = torture_create_kthread(torture_onoff, NULL, onoff_task); +#endif /* #ifdef CONFIG_HOTPLUG_CPU */ + return ret; +} +EXPORT_SYMBOL_GPL(torture_onoff_init); + +/* + * Clean up after online/offline testing. + */ +static void torture_onoff_cleanup(void) +{ +#ifdef CONFIG_HOTPLUG_CPU + if (onoff_task == NULL) + return; + VERBOSE_TOROUT_STRING("Stopping torture_onoff task"); + kthread_stop(onoff_task); + onoff_task = NULL; +#endif /* #ifdef CONFIG_HOTPLUG_CPU */ +} +EXPORT_SYMBOL_GPL(torture_onoff_cleanup); + +/* + * Print online/offline testing statistics. + */ +char *torture_onoff_stats(char *page) +{ +#ifdef CONFIG_HOTPLUG_CPU + page += sprintf(page, + "onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ", + n_online_successes, n_online_attempts, + n_offline_successes, n_offline_attempts, + min_online, max_online, + min_offline, max_offline, + sum_online, sum_offline, HZ); +#endif /* #ifdef CONFIG_HOTPLUG_CPU */ + return page; +} +EXPORT_SYMBOL_GPL(torture_onoff_stats); + +/* + * Were all the online/offline operations successful? + */ +bool torture_onoff_failures(void) +{ +#ifdef CONFIG_HOTPLUG_CPU + return n_online_successes != n_online_attempts || + n_offline_successes != n_offline_attempts; +#else /* #ifdef CONFIG_HOTPLUG_CPU */ + return false; +#endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ +} +EXPORT_SYMBOL_GPL(torture_onoff_failures); + +#define TORTURE_RANDOM_MULT 39916801 /* prime */ +#define TORTURE_RANDOM_ADD 479001701 /* prime */ +#define TORTURE_RANDOM_REFRESH 10000 + +/* + * Crude but fast random-number generator. Uses a linear congruential + * generator, with occasional help from cpu_clock(). + */ +unsigned long +torture_random(struct torture_random_state *trsp) +{ + if (--trsp->trs_count < 0) { + trsp->trs_state += (unsigned long)local_clock(); + trsp->trs_count = TORTURE_RANDOM_REFRESH; + } + trsp->trs_state = trsp->trs_state * TORTURE_RANDOM_MULT + + TORTURE_RANDOM_ADD; + return swahw32(trsp->trs_state); +} +EXPORT_SYMBOL_GPL(torture_random); + +/* + * Variables for shuffling. The idea is to ensure that each CPU stays + * idle for an extended period to test interactions with dyntick idle, + * as well as interactions with any per-CPU varibles. + */ +struct shuffle_task { + struct list_head st_l; + struct task_struct *st_t; +}; + +static long shuffle_interval; /* In jiffies. */ +static struct task_struct *shuffler_task; +static cpumask_var_t shuffle_tmp_mask; +static int shuffle_idle_cpu; /* Force all torture tasks off this CPU */ +static struct list_head shuffle_task_list = LIST_HEAD_INIT(shuffle_task_list); +static DEFINE_MUTEX(shuffle_task_mutex); + +/* + * Register a task to be shuffled. If there is no memory, just splat + * and don't bother registering. + */ +void torture_shuffle_task_register(struct task_struct *tp) +{ + struct shuffle_task *stp; + + if (WARN_ON_ONCE(tp == NULL)) + return; + stp = kmalloc(sizeof(*stp), GFP_KERNEL); + if (WARN_ON_ONCE(stp == NULL)) + return; + stp->st_t = tp; + mutex_lock(&shuffle_task_mutex); + list_add(&stp->st_l, &shuffle_task_list); + mutex_unlock(&shuffle_task_mutex); +} +EXPORT_SYMBOL_GPL(torture_shuffle_task_register); + +/* + * Unregister all tasks, for example, at the end of the torture run. + */ +static void torture_shuffle_task_unregister_all(void) +{ + struct shuffle_task *stp; + struct shuffle_task *p; + + mutex_lock(&shuffle_task_mutex); + list_for_each_entry_safe(stp, p, &shuffle_task_list, st_l) { + list_del(&stp->st_l); + kfree(stp); + } + mutex_unlock(&shuffle_task_mutex); +} + +/* Shuffle tasks such that we allow shuffle_idle_cpu to become idle. + * A special case is when shuffle_idle_cpu = -1, in which case we allow + * the tasks to run on all CPUs. + */ +static void torture_shuffle_tasks(void) +{ + struct shuffle_task *stp; + + cpumask_setall(shuffle_tmp_mask); + get_online_cpus(); + + /* No point in shuffling if there is only one online CPU (ex: UP) */ + if (num_online_cpus() == 1) { + put_online_cpus(); + return; + } + + /* Advance to the next CPU. Upon overflow, don't idle any CPUs. */ + shuffle_idle_cpu = cpumask_next(shuffle_idle_cpu, shuffle_tmp_mask); + if (shuffle_idle_cpu >= nr_cpu_ids) + shuffle_idle_cpu = -1; + if (shuffle_idle_cpu != -1) { + cpumask_clear_cpu(shuffle_idle_cpu, shuffle_tmp_mask); + if (cpumask_empty(shuffle_tmp_mask)) { + put_online_cpus(); + return; + } + } + + mutex_lock(&shuffle_task_mutex); + list_for_each_entry(stp, &shuffle_task_list, st_l) + set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask); + mutex_unlock(&shuffle_task_mutex); + + put_online_cpus(); +} + +/* Shuffle tasks across CPUs, with the intent of allowing each CPU in the + * system to become idle at a time and cut off its timer ticks. This is meant + * to test the support for such tickless idle CPU in RCU. + */ +static int torture_shuffle(void *arg) +{ + VERBOSE_TOROUT_STRING("torture_shuffle task started"); + do { + schedule_timeout_interruptible(shuffle_interval); + torture_shuffle_tasks(); + torture_shutdown_absorb("torture_shuffle"); + } while (!torture_must_stop()); + torture_kthread_stopping("torture_shuffle"); + return 0; +} + +/* + * Start the shuffler, with shuffint in jiffies. + */ +int torture_shuffle_init(long shuffint) +{ + shuffle_interval = shuffint; + + shuffle_idle_cpu = -1; + + if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { + VERBOSE_TOROUT_ERRSTRING("Failed to alloc mask"); + return -ENOMEM; + } + + /* Create the shuffler thread */ + return torture_create_kthread(torture_shuffle, NULL, shuffler_task); +} +EXPORT_SYMBOL_GPL(torture_shuffle_init); + +/* + * Stop the shuffling. + */ +static void torture_shuffle_cleanup(void) +{ + torture_shuffle_task_unregister_all(); + if (shuffler_task) { + VERBOSE_TOROUT_STRING("Stopping torture_shuffle task"); + kthread_stop(shuffler_task); + free_cpumask_var(shuffle_tmp_mask); + } + shuffler_task = NULL; +} +EXPORT_SYMBOL_GPL(torture_shuffle_cleanup); + +/* + * Variables for auto-shutdown. This allows "lights out" torture runs + * to be fully scripted. + */ +static int shutdown_secs; /* desired test duration in seconds. */ +static struct task_struct *shutdown_task; +static unsigned long shutdown_time; /* jiffies to system shutdown. */ +static void (*torture_shutdown_hook)(void); + +/* + * Absorb kthreads into a kernel function that won't return, so that + * they won't ever access module text or data again. + */ +void torture_shutdown_absorb(const char *title) +{ + while (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { + pr_notice("torture thread %s parking due to system shutdown\n", + title); + schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT); + } +} +EXPORT_SYMBOL_GPL(torture_shutdown_absorb); + +/* + * Cause the torture test to shutdown the system after the test has + * run for the time specified by the shutdown_secs parameter. + */ +static int torture_shutdown(void *arg) +{ + long delta; + unsigned long jiffies_snap; + + VERBOSE_TOROUT_STRING("torture_shutdown task started"); + jiffies_snap = jiffies; + while (ULONG_CMP_LT(jiffies_snap, shutdown_time) && + !torture_must_stop()) { + delta = shutdown_time - jiffies_snap; + if (verbose) + pr_alert("%s" TORTURE_FLAG + "torture_shutdown task: %lu jiffies remaining\n", + torture_type, delta); + schedule_timeout_interruptible(delta); + jiffies_snap = jiffies; + } + if (torture_must_stop()) { + torture_kthread_stopping("torture_shutdown"); + return 0; + } + + /* OK, shut down the system. */ + + VERBOSE_TOROUT_STRING("torture_shutdown task shutting down system"); + shutdown_task = NULL; /* Avoid self-kill deadlock. */ + if (torture_shutdown_hook) + torture_shutdown_hook(); + else + VERBOSE_TOROUT_STRING("No torture_shutdown_hook(), skipping."); + kernel_power_off(); /* Shut down the system. */ + return 0; +} + +/* + * Start up the shutdown task. + */ +int torture_shutdown_init(int ssecs, void (*cleanup)(void)) +{ + int ret = 0; + + shutdown_secs = ssecs; + torture_shutdown_hook = cleanup; + if (shutdown_secs > 0) { + shutdown_time = jiffies + shutdown_secs * HZ; + ret = torture_create_kthread(torture_shutdown, NULL, + shutdown_task); + } + return ret; +} +EXPORT_SYMBOL_GPL(torture_shutdown_init); + +/* + * Detect and respond to a system shutdown. + */ +static int torture_shutdown_notify(struct notifier_block *unused1, + unsigned long unused2, void *unused3) +{ + mutex_lock(&fullstop_mutex); + if (ACCESS_ONCE(fullstop) == FULLSTOP_DONTSTOP) { + VERBOSE_TOROUT_STRING("Unscheduled system shutdown detected"); + ACCESS_ONCE(fullstop) = FULLSTOP_SHUTDOWN; + } else { + pr_warn("Concurrent rmmod and shutdown illegal!\n"); + } + mutex_unlock(&fullstop_mutex); + return NOTIFY_DONE; +} + +static struct notifier_block torture_shutdown_nb = { + .notifier_call = torture_shutdown_notify, +}; + +/* + * Shut down the shutdown task. Say what??? Heh! This can happen if + * the torture module gets an rmmod before the shutdown time arrives. ;-) + */ +static void torture_shutdown_cleanup(void) +{ + unregister_reboot_notifier(&torture_shutdown_nb); + if (shutdown_task != NULL) { + VERBOSE_TOROUT_STRING("Stopping torture_shutdown task"); + kthread_stop(shutdown_task); + } + shutdown_task = NULL; +} + +/* + * Variables for stuttering, which means to periodically pause and + * restart testing in order to catch bugs that appear when load is + * suddenly applied to or removed from the system. + */ +static struct task_struct *stutter_task; +static int stutter_pause_test; +static int stutter; + +/* + * Block until the stutter interval ends. This must be called periodically + * by all running kthreads that need to be subject to stuttering. + */ +void stutter_wait(const char *title) +{ + while (ACCESS_ONCE(stutter_pause_test) || + (torture_runnable && !ACCESS_ONCE(*torture_runnable))) { + if (stutter_pause_test) + schedule_timeout_interruptible(1); + else + schedule_timeout_interruptible(round_jiffies_relative(HZ)); + torture_shutdown_absorb(title); + } +} +EXPORT_SYMBOL_GPL(stutter_wait); + +/* + * Cause the torture test to "stutter", starting and stopping all + * threads periodically. + */ +static int torture_stutter(void *arg) +{ + VERBOSE_TOROUT_STRING("torture_stutter task started"); + do { + if (!torture_must_stop()) { + schedule_timeout_interruptible(stutter); + ACCESS_ONCE(stutter_pause_test) = 1; + } + if (!torture_must_stop()) + schedule_timeout_interruptible(stutter); + ACCESS_ONCE(stutter_pause_test) = 0; + torture_shutdown_absorb("torture_stutter"); + } while (!torture_must_stop()); + torture_kthread_stopping("torture_stutter"); + return 0; +} + +/* + * Initialize and kick off the torture_stutter kthread. + */ +int torture_stutter_init(int s) +{ + int ret; + + stutter = s; + ret = torture_create_kthread(torture_stutter, NULL, stutter_task); + return ret; +} +EXPORT_SYMBOL_GPL(torture_stutter_init); + +/* + * Cleanup after the torture_stutter kthread. + */ +static void torture_stutter_cleanup(void) +{ + if (!stutter_task) + return; + VERBOSE_TOROUT_STRING("Stopping torture_stutter task"); + kthread_stop(stutter_task); + stutter_task = NULL; +} + +/* + * Initialize torture module. Please note that this is -not- invoked via + * the usual module_init() mechanism, but rather by an explicit call from + * the client torture module. This call must be paired with a later + * torture_init_end(). + * + * The runnable parameter points to a flag that controls whether or not + * the test is currently runnable. If there is no such flag, pass in NULL. + */ +void __init torture_init_begin(char *ttype, bool v, int *runnable) +{ + mutex_lock(&fullstop_mutex); + torture_type = ttype; + verbose = v; + torture_runnable = runnable; + fullstop = FULLSTOP_DONTSTOP; + +} +EXPORT_SYMBOL_GPL(torture_init_begin); + +/* + * Tell the torture module that initialization is complete. + */ +void __init torture_init_end(void) +{ + mutex_unlock(&fullstop_mutex); + register_reboot_notifier(&torture_shutdown_nb); +} +EXPORT_SYMBOL_GPL(torture_init_end); + +/* + * Clean up torture module. Please note that this is -not- invoked via + * the usual module_exit() mechanism, but rather by an explicit call from + * the client torture module. Returns true if a race with system shutdown + * is detected, otherwise, all kthreads started by functions in this file + * will be shut down. + * + * This must be called before the caller starts shutting down its own + * kthreads. + */ +bool torture_cleanup(void) +{ + mutex_lock(&fullstop_mutex); + if (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { + pr_warn("Concurrent rmmod and shutdown illegal!\n"); + mutex_unlock(&fullstop_mutex); + schedule_timeout_uninterruptible(10); + return true; + } + ACCESS_ONCE(fullstop) = FULLSTOP_RMMOD; + mutex_unlock(&fullstop_mutex); + torture_shutdown_cleanup(); + torture_shuffle_cleanup(); + torture_stutter_cleanup(); + torture_onoff_cleanup(); + return false; +} +EXPORT_SYMBOL_GPL(torture_cleanup); + +/* + * Is it time for the current torture test to stop? + */ +bool torture_must_stop(void) +{ + return torture_must_stop_irq() || kthread_should_stop(); +} +EXPORT_SYMBOL_GPL(torture_must_stop); + +/* + * Is it time for the current torture test to stop? This is the irq-safe + * version, hence no check for kthread_should_stop(). + */ +bool torture_must_stop_irq(void) +{ + return ACCESS_ONCE(fullstop) != FULLSTOP_DONTSTOP; +} +EXPORT_SYMBOL_GPL(torture_must_stop_irq); + +/* + * Each kthread must wait for kthread_should_stop() before returning from + * its top-level function, otherwise segfaults ensue. This function + * prints a "stopping" message and waits for kthread_should_stop(), and + * should be called from all torture kthreads immediately prior to + * returning. + */ +void torture_kthread_stopping(char *title) +{ + if (verbose) + VERBOSE_TOROUT_STRING(title); + while (!kthread_should_stop()) { + torture_shutdown_absorb(title); + schedule_timeout_uninterruptible(1); + } +} +EXPORT_SYMBOL_GPL(torture_kthread_stopping); + +/* + * Create a generic torture kthread that is immediately runnable. If you + * need the kthread to be stopped so that you can do something to it before + * it starts, you will need to open-code your own. + */ +int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m, + char *f, struct task_struct **tp) +{ + int ret = 0; + + VERBOSE_TOROUT_STRING(m); + *tp = kthread_run(fn, arg, s); + if (IS_ERR(*tp)) { + ret = PTR_ERR(*tp); + VERBOSE_TOROUT_ERRSTRING(f); + *tp = NULL; + } + torture_shuffle_task_register(*tp); + return ret; +} +EXPORT_SYMBOL_GPL(_torture_create_kthread); + +/* + * Stop a generic kthread, emitting a message. + */ +void _torture_stop_kthread(char *m, struct task_struct **tp) +{ + if (*tp == NULL) + return; + VERBOSE_TOROUT_STRING(m); + kthread_stop(*tp); + *tp = NULL; +} +EXPORT_SYMBOL_GPL(_torture_stop_kthread); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index a48abeac753f..dd7f8858188a 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -980,6 +980,21 @@ config DEBUG_LOCKING_API_SELFTESTS The following locking APIs are covered: spinlocks, rwlocks, mutexes and rwsems. +config LOCK_TORTURE_TEST + tristate "torture tests for locking" + depends on DEBUG_KERNEL + select TORTURE_TEST + default n + help + This option provides a kernel module that runs torture tests + on kernel locking primitives. The kernel module may be built + after the fact on the running kernel to be tested, if desired. + + Say Y here if you want kernel locking-primitive torture tests + to be built into the kernel. + Say M if you want these torture tests to build as a module. + Say N if you are unsure. + endmenu # lock debugging config TRACE_IRQFLAGS @@ -1141,9 +1156,14 @@ config SPARSE_RCU_POINTER Say N if you are unsure. +config TORTURE_TEST + tristate + default n + config RCU_TORTURE_TEST tristate "torture tests for RCU" depends on DEBUG_KERNEL + select TORTURE_TEST default n help This option provides a kernel module that runs torture tests diff --git a/tools/testing/selftests/rcutorture/bin/functions.sh b/tools/testing/selftests/rcutorture/bin/functions.sh index 587561d7c035..9b17e810ddc3 100644 --- a/tools/testing/selftests/rcutorture/bin/functions.sh +++ b/tools/testing/selftests/rcutorture/bin/functions.sh @@ -96,6 +96,7 @@ identify_qemu () { echo qemu-system-ppc64 else echo Cannot figure out what qemu command to use! 1>&2 + echo file $1 output: $u # Usually this will be one of /usr/bin/qemu-system-* # Use RCU_QEMU_CMD environment variable or appropriate # argument to top-level script. diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck-lock.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck-lock.sh new file mode 100755 index 000000000000..829186e19eb1 --- /dev/null +++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck-lock.sh @@ -0,0 +1,51 @@ +#!/bin/bash +# +# Analyze a given results directory for locktorture progress. +# +# Usage: sh kvm-recheck-lock.sh resdir +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, you can access it online at +# http://www.gnu.org/licenses/gpl-2.0.html. +# +# Copyright (C) IBM Corporation, 2014 +# +# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com> + +i="$1" +if test -d $i +then + : +else + echo Unreadable results directory: $i + exit 1 +fi + +configfile=`echo $i | sed -e 's/^.*\///'` +ncs=`grep "Writes: Total:" $i/console.log 2> /dev/null | tail -1 | sed -e 's/^.* Total: //' -e 's/ .*$//'` +if test -z "$ncs" +then + echo $configfile +else + title="$configfile ------- $ncs acquisitions/releases" + dur=`sed -e 's/^.* locktorture.shutdown_secs=//' -e 's/ .*$//' < $i/qemu-cmd 2> /dev/null` + if test -z "$dur" + then + : + else + ncsps=`awk -v ncs=$ncs -v dur=$dur ' + BEGIN { print ncs / dur }' < /dev/null` + title="$title ($ncsps per second)" + fi + echo $title +fi diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh new file mode 100755 index 000000000000..d75b1dc5ae53 --- /dev/null +++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh @@ -0,0 +1,51 @@ +#!/bin/bash +# +# Analyze a given results directory for rcutorture progress. +# +# Usage: sh kvm-recheck-rcu.sh resdir +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, you can access it online at +# http://www.gnu.org/licenses/gpl-2.0.html. +# +# Copyright (C) IBM Corporation, 2014 +# +# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com> + +i="$1" +if test -d $i +then + : +else + echo Unreadable results directory: $i + exit 1 +fi + +configfile=`echo $i | sed -e 's/^.*\///'` +ngps=`grep ver: $i/console.log 2> /dev/null | tail -1 | sed -e 's/^.* ver: //' -e 's/ .*$//'` +if test -z "$ngps" +then + echo $configfile +else + title="$configfile ------- $ngps grace periods" + dur=`sed -e 's/^.* rcutorture.shutdown_secs=//' -e 's/ .*$//' < $i/qemu-cmd 2> /dev/null` + if test -z "$dur" + then + : + else + ngpsps=`awk -v ngps=$ngps -v dur=$dur ' + BEGIN { print ngps / dur }' < /dev/null` + title="$title ($ngpsps per second)" + fi + echo $title +fi diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh index baef09f3469b..a44daaa259a9 100755 --- a/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh +++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh @@ -1,6 +1,6 @@ #!/bin/bash # -# Given the results directories for previous KVM runs of rcutorture, +# Given the results directories for previous KVM-based torture runs, # check the build and console output for errors. Given a directory # containing results directories, this recursively checks them all. # @@ -27,11 +27,18 @@ PATH=`pwd`/tools/testing/selftests/rcutorture/bin:$PATH; export PATH for rd in "$@" do + firsttime=1 dirs=`find $rd -name Make.defconfig.out -print | sort | sed -e 's,/[^/]*$,,' | sort -u` for i in $dirs do - configfile=`echo $i | sed -e 's/^.*\///'` - echo $configfile + if test -n "$firsttime" + then + firsttime="" + resdir=`echo $i | sed -e 's,/$,,' -e 's,/[^/]*$,,'` + head -1 $resdir/log + fi + TORTURE_SUITE="`cat $i/../TORTURE_SUITE`" + kvm-recheck-${TORTURE_SUITE}.sh $i configcheck.sh $i/.config $i/ConfigFragment parse-build.sh $i/Make.out $configfile parse-rcutorture.sh $i/console.log $configfile diff --git a/tools/testing/selftests/rcutorture/bin/kvm-test-1-rcu.sh b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh index 151b23788935..94b28bb37d36 100755 --- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-rcu.sh +++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh @@ -6,15 +6,15 @@ # Execute this in the source tree. Do not run it as a background task # because qemu does not seem to like that much. # -# Usage: sh kvm-test-1-rcu.sh config builddir resdir minutes qemu-args bootargs +# Usage: sh kvm-test-1-run.sh config builddir resdir minutes qemu-args boot_args # -# qemu-args defaults to "" -- you will want "-nographic" if running headless. -# bootargs defaults to "root=/dev/sda noapic selinux=0 console=ttyS0" -# "initcall_debug debug rcutorture.stat_interval=15" -# "rcutorture.shutdown_secs=$((minutes * 60))" -# "rcutorture.rcutorture_runnable=1" +# qemu-args defaults to "-nographic", along with arguments specifying the +# number of CPUs and other options generated from +# the underlying CPU architecture. +# boot_args defaults to value returned by the per_version_boot_params +# shell function. # -# Anything you specify for either qemu-args or bootargs is appended to +# Anything you specify for either qemu-args or boot_args is appended to # the default values. The "-smp" value is deduced from the contents of # the config fragment. # @@ -40,32 +40,34 @@ grace=120 -T=/tmp/kvm-test-1-rcu.sh.$$ +T=/tmp/kvm-test-1-run.sh.$$ trap 'rm -rf $T' 0 . $KVM/bin/functions.sh . $KVPATH/ver_functions.sh config_template=${1} +config_dir=`echo $config_template | sed -e 's,/[^/]*$,,'` title=`echo $config_template | sed -e 's/^.*\///'` builddir=${2} if test -z "$builddir" -o ! -d "$builddir" -o ! -w "$builddir" then - echo "kvm-test-1-rcu.sh :$builddir: Not a writable directory, cannot build into it" + echo "kvm-test-1-run.sh :$builddir: Not a writable directory, cannot build into it" exit 1 fi resdir=${3} if test -z "$resdir" -o ! -d "$resdir" -o ! -w "$resdir" then - echo "kvm-test-1-rcu.sh :$resdir: Not a writable directory, cannot build into it" + echo "kvm-test-1-run.sh :$resdir: Not a writable directory, cannot store results into it" exit 1 fi cp $config_template $resdir/ConfigFragment echo ' ---' `date`: Starting build echo ' ---' Kconfig fragment at: $config_template >> $resdir/log -cat << '___EOF___' >> $T -CONFIG_RCU_TORTURE_TEST=y -___EOF___ +if test -r "$config_dir/CFcommon" +then + cat < $config_dir/CFcommon >> $T +fi # Optimizations below this point # CONFIG_USB=n # CONFIG_SECURITY=n @@ -96,11 +98,23 @@ then cp $builddir/.config $resdir cp $builddir/arch/x86/boot/bzImage $resdir parse-build.sh $resdir/Make.out $title + if test -f $builddir.wait + then + mv $builddir.wait $builddir.ready + fi else cp $builddir/Make*.out $resdir echo Build failed, not running KVM, see $resdir. + if test -f $builddir.wait + then + mv $builddir.wait $builddir.ready + fi exit 1 fi +while test -f $builddir.ready +do + sleep 1 +done minutes=$4 seconds=$(($minutes * 60)) qemu_args=$5 @@ -111,9 +125,10 @@ kstarttime=`awk 'BEGIN { print systime() }' < /dev/null` echo ' ---' `date`: Starting kernel # Determine the appropriate flavor of qemu command. -QEMU="`identify_qemu $builddir/vmlinux.o`" +QEMU="`identify_qemu $builddir/vmlinux`" # Generate -smp qemu argument. +qemu_args="-nographic $qemu_args" cpu_count=`configNR_CPUS.sh $config_template` vcpus=`identify_qemu_vcpus` if test $cpu_count -gt $vcpus @@ -133,12 +148,8 @@ qemu_append="`identify_qemu_append "$QEMU"`" # Pull in Kconfig-fragment boot parameters boot_args="`configfrag_boot_params "$boot_args" "$config_template"`" -# Generate CPU-hotplug boot parameters -boot_args="`rcutorture_param_onoff "$boot_args" $builddir/.config`" -# Generate rcu_barrier() boot parameter -boot_args="`rcutorture_param_n_barrier_cbs "$boot_args"`" -# Pull in standard rcutorture boot arguments -boot_args="$boot_args rcutorture.stat_interval=15 rcutorture.shutdown_secs=$seconds rcutorture.rcutorture_runnable=1" +# Generate kernel-version-specific boot parameters +boot_args="`per_version_boot_params "$boot_args" $builddir/.config $seconds`" echo $QEMU $qemu_args -m 512 -kernel $builddir/arch/x86/boot/bzImage -append \"$qemu_append $boot_args\" > $resdir/qemu-cmd if test -n "$RCU_BUILDONLY" @@ -188,5 +199,5 @@ then fi cp $builddir/console.log $resdir -parse-rcutorture.sh $resdir/console.log $title +parse-${TORTURE_SUITE}torture.sh $resdir/console.log $title parse-console.sh $resdir/console.log $title diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh index 1b7923bf6a70..5a78cbf55f06 100644 --- a/tools/testing/selftests/rcutorture/bin/kvm.sh +++ b/tools/testing/selftests/rcutorture/bin/kvm.sh @@ -30,14 +30,21 @@ scriptname=$0 args="$*" +T=/tmp/kvm.sh.$$ +trap 'rm -rf $T' 0 +mkdir $T + dur=30 +dryrun="" KVM="`pwd`/tools/testing/selftests/rcutorture"; export KVM PATH=${KVM}/bin:$PATH; export PATH builddir="${KVM}/b1" RCU_INITRD="$KVM/initrd"; export RCU_INITRD RCU_KMAKE_ARG=""; export RCU_KMAKE_ARG +TORTURE_SUITE=rcu resdir="" configs="" +cpus=0 ds=`date +%Y.%m.%d-%H:%M:%S` kversion="" @@ -49,7 +56,9 @@ usage () { echo " --builddir absolute-pathname" echo " --buildonly" echo " --configs \"config-file list\"" + echo " --cpus N" echo " --datestamp string" + echo " --dryrun sched|script" echo " --duration minutes" echo " --interactive" echo " --kmake-arg kernel-make-arguments" @@ -58,8 +67,9 @@ usage () { echo " --no-initrd" echo " --qemu-args qemu-system-..." echo " --qemu-cmd qemu-system-..." - echo " --results absolute-pathname" echo " --relbuilddir relative-pathname" + echo " --results absolute-pathname" + echo " --torture rcu" exit 1 } @@ -85,11 +95,21 @@ do configs="$2" shift ;; + --cpus) + checkarg --cpus "(number)" "$#" "$2" '^[0-9]*$' '^--' + cpus=$2 + shift + ;; --datestamp) checkarg --datestamp "(relative pathname)" "$#" "$2" '^[^/]*$' '^--' ds=$2 shift ;; + --dryrun) + checkarg --dryrun "sched|script" $# "$2" 'sched\|script' '^--' + dryrun=$2 + shift + ;; --duration) checkarg --duration "(minutes)" $# "$2" '^[0-9]*$' '^error' dur=$2 @@ -138,6 +158,11 @@ do resdir=$2 shift ;; + --torture) + checkarg --torture "(suite name)" "$#" "$2" '^\(lock\|rcu\)$' '^--' + TORTURE_SUITE=$2 + shift + ;; *) echo Unknown argument $1 usage @@ -146,7 +171,7 @@ do shift done -CONFIGFRAG=${KVM}/configs; export CONFIGFRAG +CONFIGFRAG=${KVM}/configs/${TORTURE_SUITE}; export CONFIGFRAG KVPATH=${CONFIGFRAG}/$kversion; export KVPATH if test -z "$configs" @@ -157,54 +182,231 @@ fi if test -z "$resdir" then resdir=$KVM/res - if ! test -e $resdir - then - mkdir $resdir || : - fi -else +fi + +if test "$dryrun" = "" +then if ! test -e $resdir then mkdir -p "$resdir" || : fi -fi -mkdir $resdir/$ds -touch $resdir/$ds/log -echo $scriptname $args >> $resdir/$ds/log + mkdir $resdir/$ds -pwd > $resdir/$ds/testid.txt -if test -d .git -then - git status >> $resdir/$ds/testid.txt - git rev-parse HEAD >> $resdir/$ds/testid.txt -fi -builddir=$KVM/b1 -if ! test -e $builddir -then - mkdir $builddir || : + # Be noisy only if running the script. + echo Results directory: $resdir/$ds + echo $scriptname $args + + touch $resdir/$ds/log + echo $scriptname $args >> $resdir/$ds/log + echo ${TORTURE_SUITE} > $resdir/$ds/TORTURE_SUITE + + pwd > $resdir/$ds/testid.txt + if test -d .git + then + git status >> $resdir/$ds/testid.txt + git rev-parse HEAD >> $resdir/$ds/testid.txt + fi fi +# Create a file of test-name/#cpus pairs, sorted by decreasing #cpus. +touch $T/cfgcpu for CF in $configs do - # Running TREE01 multiple times creates TREE01, TREE01.2, TREE01.3, ... - rd=$resdir/$ds/$CF - if test -d "${rd}" + if test -f "$CONFIGFRAG/$kversion/$CF" then - n="`ls -d "${rd}"* | grep '\.[0-9]\+$' | - sed -e 's/^.*\.\([0-9]\+\)/\1/' | - sort -k1n | tail -1`" - if test -z "$n" - then - rd="${rd}.2" - else - n="`expr $n + 1`" - rd="${rd}.${n}" - fi + echo $CF `configNR_CPUS.sh $CONFIGFRAG/$kversion/$CF` >> $T/cfgcpu + else + echo "The --configs file $CF does not exist, terminating." + exit 1 fi - mkdir "${rd}" - echo Results directory: $rd - kvm-test-1-rcu.sh $CONFIGFRAG/$kversion/$CF $builddir $rd $dur "-nographic $RCU_QEMU_ARG" "rcutorture.test_no_idle_hz=1 rcutorture.verbose=1 $RCU_BOOTARGS" done +sort -k2nr $T/cfgcpu > $T/cfgcpu.sort + +# Use a greedy bin-packing algorithm, sorting the list accordingly. +awk < $T/cfgcpu.sort > $T/cfgcpu.pack -v ncpus=$cpus ' +BEGIN { + njobs = 0; +} + +{ + # Read file of tests and corresponding required numbers of CPUs. + cf[njobs] = $1; + cpus[njobs] = $2; + njobs++; +} + +END { + alldone = 0; + batch = 0; + nc = -1; + + # Each pass through the following loop creates on test batch + # that can be executed concurrently given ncpus. Note that a + # given test that requires more than the available CPUs will run in + # their own batch. Such tests just have to make do with what + # is available. + while (nc != ncpus) { + batch++; + nc = ncpus; + + # Each pass through the following loop considers one + # test for inclusion in the current batch. + for (i = 0; i < njobs; i++) { + if (done[i]) + continue; # Already part of a batch. + if (nc >= cpus[i] || nc == ncpus) { + + # This test fits into the current batch. + done[i] = batch; + nc -= cpus[i]; + if (nc <= 0) + break; # Too-big test in its own batch. + } + } + } + + # Dump out the tests in batch order. + for (b = 1; b <= batch; b++) + for (i = 0; i < njobs; i++) + if (done[i] == b) + print cf[i], cpus[i]; +}' + +# Generate a script to execute the tests in appropriate batches. +cat << ___EOF___ > $T/script +TORTURE_SUITE="$TORTURE_SUITE"; export TORTURE_SUITE +___EOF___ +awk < $T/cfgcpu.pack \ + -v CONFIGDIR="$CONFIGFRAG/$kversion/" \ + -v KVM="$KVM" \ + -v ncpus=$cpus \ + -v rd=$resdir/$ds/ \ + -v dur=$dur \ + -v RCU_QEMU_ARG=$RCU_QEMU_ARG \ + -v RCU_BOOTARGS=$RCU_BOOTARGS \ +'BEGIN { + i = 0; +} + +{ + cf[i] = $1; + cpus[i] = $2; + i++; +} + +# Dump out the scripting required to run one test batch. +function dump(first, pastlast) +{ + print "echo ----Start batch: `date`"; + print "echo ----Start batch: `date` >> " rd "/log"; + jn=1 + for (j = first; j < pastlast; j++) { + builddir=KVM "/b" jn + cpusr[jn] = cpus[j]; + if (cfrep[cf[j]] == "") { + cfr[jn] = cf[j]; + cfrep[cf[j]] = 1; + } else { + cfrep[cf[j]]++; + cfr[jn] = cf[j] "." cfrep[cf[j]]; + } + if (cpusr[jn] > ncpus && ncpus != 0) + ovf = "(!)"; + else + ovf = ""; + print "echo ", cfr[jn], cpusr[jn] ovf ": Starting build. `date`"; + print "echo ", cfr[jn], cpusr[jn] ovf ": Starting build. `date` >> " rd "/log"; + print "rm -f " builddir ".*"; + print "touch " builddir ".wait"; + print "mkdir " builddir " > /dev/null 2>&1 || :"; + print "mkdir " rd cfr[jn] " || :"; + print "kvm-test-1-run.sh " CONFIGDIR cf[j], builddir, rd cfr[jn], dur " \"" RCU_QEMU_ARG "\" \"" RCU_BOOTARGS "\" > " rd cfr[jn] "/kvm-test-1-run.sh.out 2>&1 &" + print "echo ", cfr[jn], cpusr[jn] ovf ": Waiting for build to complete. `date`"; + print "echo ", cfr[jn], cpusr[jn] ovf ": Waiting for build to complete. `date` >> " rd "/log"; + print "while test -f " builddir ".wait" + print "do" + print "\tsleep 1" + print "done" + print "echo ", cfr[jn], cpusr[jn] ovf ": Build complete. `date`"; + print "echo ", cfr[jn], cpusr[jn] ovf ": Build complete. `date` >> " rd "/log"; + jn++; + } + for (j = 1; j < jn; j++) { + builddir=KVM "/b" j + print "rm -f " builddir ".ready" + print "echo ----", cfr[j], cpusr[j] ovf ": Starting kernel. `date`"; + print "echo ----", cfr[j], cpusr[j] ovf ": Starting kernel. `date` >> " rd "/log"; + } + print "wait" + print "echo ---- All kernel runs complete. `date`"; + print "echo ---- All kernel runs complete. `date` >> " rd "/log"; + for (j = 1; j < jn; j++) { + builddir=KVM "/b" j + print "echo ----", cfr[j], cpusr[j] ovf ": Build/run results:"; + print "echo ----", cfr[j], cpusr[j] ovf ": Build/run results: >> " rd "/log"; + print "cat " rd cfr[j] "/kvm-test-1-run.sh.out"; + print "cat " rd cfr[j] "/kvm-test-1-run.sh.out >> " rd "/log"; + } +} + +END { + njobs = i; + nc = ncpus; + first = 0; + + # Each pass through the following loop considers one test. + for (i = 0; i < njobs; i++) { + if (ncpus == 0) { + # Sequential test specified, each test its own batch. + dump(i, i + 1); + first = i; + } else if (nc < cpus[i] && i != 0) { + # Out of CPUs, dump out a batch. + dump(first, i); + first = i; + nc = ncpus; + } + # Account for the CPUs needed by the current test. + nc -= cpus[i]; + } + # Dump the last batch. + if (ncpus != 0) + dump(first, i); +}' >> $T/script + +if test "$dryrun" = script +then + # Dump out the script, but define the environment variables that + # it needs to run standalone. + echo CONFIGFRAG="$CONFIGFRAG; export CONFIGFRAG" + echo KVM="$KVM; export KVM" + echo KVPATH="$KVPATH; export KVPATH" + echo PATH="$PATH; export PATH" + echo RCU_BUILDONLY="$RCU_BUILDONLY; export RCU_BUILDONLY" + echo RCU_INITRD="$RCU_INITRD; export RCU_INITRD" + echo RCU_KMAKE_ARG="$RCU_KMAKE_ARG; export RCU_KMAKE_ARG" + echo RCU_QEMU_CMD="$RCU_QEMU_CMD; export RCU_QEMU_CMD" + echo RCU_QEMU_INTERACTIVE="$RCU_QEMU_INTERACTIVE; export RCU_QEMU_INTERACTIVE" + echo RCU_QEMU_MAC="$RCU_QEMU_MAC; export RCU_QEMU_MAC" + echo "mkdir -p "$resdir" || :" + echo "mkdir $resdir/$ds" + cat $T/script + exit 0 +elif test "$dryrun" = sched +then + # Extract the test run schedule from the script. + egrep 'start batch|Starting build\.' $T/script | + sed -e 's/:.*$//' -e 's/^echo //' + exit 0 +else + # Not a dryru, so run the script. + sh $T/script +fi + # Tracing: trace_event=rcu:rcu_grace_period,rcu:rcu_future_grace_period,rcu:rcu_grace_period_init,rcu:rcu_nocb_wake,rcu:rcu_preempt_task,rcu:rcu_unlock_preempted_task,rcu:rcu_quiescent_state_report,rcu:rcu_fqs,rcu:rcu_callback,rcu:rcu_kfree_callback,rcu:rcu_batch_start,rcu:rcu_invoke_callback,rcu:rcu_invoke_kfree_callback,rcu:rcu_batch_end,rcu:rcu_torture_read,rcu:rcu_barrier +echo +echo echo " --- `date` Test summary:" +echo Results directory: $resdir/$ds kvm-recheck.sh $resdir/$ds diff --git a/tools/testing/selftests/rcutorture/configs/lock/BUSTED b/tools/testing/selftests/rcutorture/configs/lock/BUSTED new file mode 100644 index 000000000000..1d1da1477fc3 --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/lock/BUSTED @@ -0,0 +1,6 @@ +CONFIG_SMP=y +CONFIG_NR_CPUS=4 +CONFIG_HOTPLUG_CPU=y +CONFIG_PREEMPT_NONE=n +CONFIG_PREEMPT_VOLUNTARY=n +CONFIG_PREEMPT=y diff --git a/tools/testing/selftests/rcutorture/configs/lock/BUSTED.boot b/tools/testing/selftests/rcutorture/configs/lock/BUSTED.boot new file mode 100644 index 000000000000..6386c15e9770 --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/lock/BUSTED.boot @@ -0,0 +1 @@ +locktorture.torture_type=lock_busted diff --git a/tools/testing/selftests/rcutorture/configs/lock/CFLIST b/tools/testing/selftests/rcutorture/configs/lock/CFLIST new file mode 100644 index 000000000000..a061b22d1892 --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/lock/CFLIST @@ -0,0 +1 @@ +LOCK01 diff --git a/tools/testing/selftests/rcutorture/configs/lock/CFcommon b/tools/testing/selftests/rcutorture/configs/lock/CFcommon new file mode 100644 index 000000000000..e372dc269254 --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/lock/CFcommon @@ -0,0 +1,2 @@ +CONFIG_LOCK_TORTURE_TEST=y +CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/lock/LOCK01 b/tools/testing/selftests/rcutorture/configs/lock/LOCK01 new file mode 100644 index 000000000000..a9625e3d6cd9 --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/lock/LOCK01 @@ -0,0 +1,6 @@ +CONFIG_SMP=y +CONFIG_NR_CPUS=8 +CONFIG_HOTPLUG_CPU=y +CONFIG_PREEMPT_NONE=n +CONFIG_PREEMPT_VOLUNTARY=n +CONFIG_PREEMPT=y diff --git a/tools/testing/selftests/rcutorture/configs/lock/ver_functions.sh b/tools/testing/selftests/rcutorture/configs/lock/ver_functions.sh new file mode 100644 index 000000000000..9746ea1cd6c7 --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/lock/ver_functions.sh @@ -0,0 +1,43 @@ +#!/bin/bash +# +# Kernel-version-dependent shell functions for the rest of the scripts. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, you can access it online at +# http://www.gnu.org/licenses/gpl-2.0.html. +# +# Copyright (C) IBM Corporation, 2014 +# +# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com> + +# locktorture_param_onoff bootparam-string config-file +# +# Adds onoff locktorture module parameters to kernels having it. +locktorture_param_onoff () { + if ! bootparam_hotplug_cpu "$1" && configfrag_hotplug_cpu "$2" + then + echo CPU-hotplug kernel, adding locktorture onoff. 1>&2 + echo locktorture.onoff_interval=3 locktorture.onoff_holdoff=30 + fi +} + +# per_version_boot_params bootparam-string config-file seconds +# +# Adds per-version torture-module parameters to kernels supporting them. +per_version_boot_params () { + echo $1 `locktorture_param_onoff "$1" "$2"` \ + locktorture.stat_interval=15 \ + locktorture.shutdown_secs=$3 \ + locktorture.locktorture_runnable=1 \ + locktorture.verbose=1 +} diff --git a/tools/testing/selftests/rcutorture/configs/rcu/BUSTED b/tools/testing/selftests/rcutorture/configs/rcu/BUSTED new file mode 100644 index 000000000000..48d8a245c7fa --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/rcu/BUSTED @@ -0,0 +1,7 @@ +CONFIG_RCU_TRACE=n +CONFIG_SMP=y +CONFIG_NR_CPUS=4 +CONFIG_HOTPLUG_CPU=y +CONFIG_PREEMPT_NONE=n +CONFIG_PREEMPT_VOLUNTARY=n +CONFIG_PREEMPT=y diff --git a/tools/testing/selftests/rcutorture/configs/rcu/BUSTED.boot b/tools/testing/selftests/rcutorture/configs/rcu/BUSTED.boot new file mode 100644 index 000000000000..6804f9dcfc1b --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/rcu/BUSTED.boot @@ -0,0 +1 @@ +rcutorture.torture_type=rcu_busted diff --git a/tools/testing/selftests/rcutorture/configs/CFLIST b/tools/testing/selftests/rcutorture/configs/rcu/CFLIST index cd3d29cb0a47..cd3d29cb0a47 100644 --- a/tools/testing/selftests/rcutorture/configs/CFLIST +++ b/tools/testing/selftests/rcutorture/configs/rcu/CFLIST diff --git a/tools/testing/selftests/rcutorture/configs/rcu/CFcommon b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon new file mode 100644 index 000000000000..d2d2a86139db --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon @@ -0,0 +1,2 @@ +CONFIG_RCU_TORTURE_TEST=y +CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/SRCU-N b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N index 10a0e27f4c75..9fbb41b9b314 100644 --- a/tools/testing/selftests/rcutorture/configs/SRCU-N +++ b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N @@ -1,8 +1,7 @@ CONFIG_RCU_TRACE=n CONFIG_SMP=y -CONFIG_NR_CPUS=8 +CONFIG_NR_CPUS=4 CONFIG_HOTPLUG_CPU=y CONFIG_PREEMPT_NONE=y CONFIG_PREEMPT_VOLUNTARY=n CONFIG_PREEMPT=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/SRCU-N.boot b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N.boot index 238bfe3bd0cc..238bfe3bd0cc 100644 --- a/tools/testing/selftests/rcutorture/configs/SRCU-N.boot +++ b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N.boot diff --git a/tools/testing/selftests/rcutorture/configs/SRCU-P b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-P index 6650e00c6d91..4b6f272dba27 100644 --- a/tools/testing/selftests/rcutorture/configs/SRCU-P +++ b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-P @@ -5,4 +5,3 @@ CONFIG_HOTPLUG_CPU=y CONFIG_PREEMPT_NONE=n CONFIG_PREEMPT_VOLUNTARY=n CONFIG_PREEMPT=y -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/SRCU-P.boot b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-P.boot index 238bfe3bd0cc..238bfe3bd0cc 100644 --- a/tools/testing/selftests/rcutorture/configs/SRCU-P.boot +++ b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-P.boot diff --git a/tools/testing/selftests/rcutorture/configs/TINY01 b/tools/testing/selftests/rcutorture/configs/rcu/TINY01 index 0c2823f21712..0a63e073a00c 100644 --- a/tools/testing/selftests/rcutorture/configs/TINY01 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TINY01 @@ -10,4 +10,3 @@ CONFIG_RCU_TRACE=n CONFIG_DEBUG_LOCK_ALLOC=n CONFIG_DEBUG_OBJECTS_RCU_HEAD=n CONFIG_PREEMPT_COUNT=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TINY02 b/tools/testing/selftests/rcutorture/configs/rcu/TINY02 index e5072d7528b6..f4feaee40776 100644 --- a/tools/testing/selftests/rcutorture/configs/TINY02 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TINY02 @@ -10,4 +10,3 @@ CONFIG_RCU_TRACE=y CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_DEBUG_OBJECTS_RCU_HEAD=n CONFIG_PREEMPT_COUNT=y -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE01 b/tools/testing/selftests/rcutorture/configs/rcu/TREE01 index 141119a00044..9c827ec59a97 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE01 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE01 @@ -20,4 +20,3 @@ CONFIG_RCU_CPU_STALL_INFO=n CONFIG_RCU_CPU_STALL_VERBOSE=n CONFIG_RCU_BOOST=n CONFIG_DEBUG_OBJECTS_RCU_HEAD=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE01.boot b/tools/testing/selftests/rcutorture/configs/rcu/TREE01.boot index 0fc8a3428938..0fc8a3428938 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE01.boot +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE01.boot diff --git a/tools/testing/selftests/rcutorture/configs/TREE02 b/tools/testing/selftests/rcutorture/configs/rcu/TREE02 index 2d4d09608528..1a777b5f68b5 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE02 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE02 @@ -7,7 +7,7 @@ CONFIG_PREEMPT=y CONFIG_HZ_PERIODIC=n CONFIG_NO_HZ_IDLE=y CONFIG_NO_HZ_FULL=n -CONFIG_RCU_FAST_NO_HZ=n +CONFIG_RCU_FAST_NO_HZ=n CONFIG_RCU_TRACE=n CONFIG_HOTPLUG_CPU=n CONFIG_SUSPEND=n @@ -23,4 +23,3 @@ CONFIG_RCU_CPU_STALL_INFO=n CONFIG_RCU_CPU_STALL_VERBOSE=y CONFIG_RCU_BOOST=n CONFIG_DEBUG_OBJECTS_RCU_HEAD=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE03 b/tools/testing/selftests/rcutorture/configs/rcu/TREE03 index a47de5be8a04..c1f111c1561b 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE03 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE03 @@ -20,4 +20,3 @@ CONFIG_RCU_CPU_STALL_VERBOSE=n CONFIG_RCU_BOOST=y CONFIG_RCU_BOOST_PRIO=2 CONFIG_DEBUG_OBJECTS_RCU_HEAD=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE04 b/tools/testing/selftests/rcutorture/configs/rcu/TREE04 index 8d839b86a1d5..7dbd27ce17a4 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE04 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE04 @@ -22,4 +22,3 @@ CONFIG_PROVE_RCU_DELAY=n CONFIG_RCU_CPU_STALL_INFO=y CONFIG_RCU_CPU_STALL_VERBOSE=y CONFIG_DEBUG_OBJECTS_RCU_HEAD=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE04.boot b/tools/testing/selftests/rcutorture/configs/rcu/TREE04.boot index 0fc8a3428938..0fc8a3428938 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE04.boot +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE04.boot diff --git a/tools/testing/selftests/rcutorture/configs/TREE05 b/tools/testing/selftests/rcutorture/configs/rcu/TREE05 index b5ba72ea25cb..d0f32e574743 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE05 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE05 @@ -22,4 +22,3 @@ CONFIG_PROVE_RCU_DELAY=y CONFIG_RCU_CPU_STALL_INFO=n CONFIG_RCU_CPU_STALL_VERBOSE=n CONFIG_DEBUG_OBJECTS_RCU_HEAD=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE05.boot b/tools/testing/selftests/rcutorture/configs/rcu/TREE05.boot index 3b42b8b033cd..3b42b8b033cd 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE05.boot +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE05.boot diff --git a/tools/testing/selftests/rcutorture/configs/TREE06 b/tools/testing/selftests/rcutorture/configs/rcu/TREE06 index 7c95ab48d29f..2e477dfb9c57 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE06 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE06 @@ -23,4 +23,3 @@ CONFIG_PROVE_RCU_DELAY=n CONFIG_RCU_CPU_STALL_INFO=n CONFIG_RCU_CPU_STALL_VERBOSE=n CONFIG_DEBUG_OBJECTS_RCU_HEAD=y -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE07 b/tools/testing/selftests/rcutorture/configs/rcu/TREE07 index 1467404bdec1..042f86ef362a 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE07 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE07 @@ -21,4 +21,3 @@ CONFIG_PROVE_RCU_DELAY=n CONFIG_RCU_CPU_STALL_INFO=y CONFIG_RCU_CPU_STALL_VERBOSE=n CONFIG_DEBUG_OBJECTS_RCU_HEAD=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE08 b/tools/testing/selftests/rcutorture/configs/rcu/TREE08 index 7d097a61ac2a..3438cee1e3c5 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE08 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE08 @@ -23,4 +23,3 @@ CONFIG_RCU_CPU_STALL_INFO=n CONFIG_RCU_CPU_STALL_VERBOSE=n CONFIG_RCU_BOOST=n CONFIG_DEBUG_OBJECTS_RCU_HEAD=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE08-T b/tools/testing/selftests/rcutorture/configs/rcu/TREE08-T index 442c4e450ab3..bf4523d3e44c 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE08-T +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE08-T @@ -23,4 +23,3 @@ CONFIG_RCU_CPU_STALL_INFO=n CONFIG_RCU_CPU_STALL_VERBOSE=n CONFIG_RCU_BOOST=n CONFIG_DEBUG_OBJECTS_RCU_HEAD=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/TREE09 b/tools/testing/selftests/rcutorture/configs/rcu/TREE09 index 0d1ec0d3dfee..81e4f7c0bf0b 100644 --- a/tools/testing/selftests/rcutorture/configs/TREE09 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE09 @@ -18,4 +18,3 @@ CONFIG_RCU_CPU_STALL_INFO=n CONFIG_RCU_CPU_STALL_VERBOSE=n CONFIG_RCU_BOOST=n CONFIG_DEBUG_OBJECTS_RCU_HEAD=n -CONFIG_PRINTK_TIME=y diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/CFLIST b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/CFLIST index 18223947bbcb..18223947bbcb 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/CFLIST +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/CFLIST diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/N1-S-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N1-S-T-NH-SD-SMP-HP index d3ef873eb6e7..d3ef873eb6e7 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/N1-S-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N1-S-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/N2-2-t-nh-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N2-2-t-nh-sd-SMP-hp index 02e418572b1b..02e418572b1b 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/N2-2-t-nh-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N2-2-t-nh-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/N3-3-T-nh-SD-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N3-3-T-nh-SD-SMP-hp index b3100f69c8cf..b3100f69c8cf 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/N3-3-T-nh-SD-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N3-3-T-nh-SD-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/N4-A-t-NH-sd-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N4-A-t-NH-sd-SMP-HP index c56b44530725..c56b44530725 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/N4-A-t-NH-sd-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N4-A-t-NH-sd-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/N5-U-T-NH-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N5-U-T-NH-sd-SMP-hp index 90d924fea9e9..90d924fea9e9 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/N5-U-T-NH-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/N5-U-T-NH-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/NT1-nh b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/NT1-nh index 023f312a931c..023f312a931c 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/NT1-nh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/NT1-nh diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/NT3-NH b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/NT3-NH index 6fd0235dae73..6fd0235dae73 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/NT3-NH +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/NT3-NH diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/P1-S-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P1-S-T-NH-SD-SMP-HP index f72402d7c13d..f72402d7c13d 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/P1-S-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P1-S-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/P2-2-t-nh-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P2-2-t-nh-sd-SMP-hp index 0f3b667d2a9f..0f3b667d2a9f 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/P2-2-t-nh-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P2-2-t-nh-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/P3-3-T-nh-SD-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P3-3-T-nh-SD-SMP-hp index b035e141bf2a..b035e141bf2a 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/P3-3-T-nh-SD-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P3-3-T-nh-SD-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/P4-A-t-NH-sd-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P4-A-t-NH-sd-SMP-HP index 3ccf6a9447f5..3ccf6a9447f5 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/P4-A-t-NH-sd-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P4-A-t-NH-sd-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/P5-U-T-NH-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P5-U-T-NH-sd-SMP-hp index ef624ce73d8e..ef624ce73d8e 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/P5-U-T-NH-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/P5-U-T-NH-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/PT1-nh b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/PT1-nh index e3361c3894a1..e3361c3894a1 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/PT1-nh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/PT1-nh diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/PT2-NH b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/PT2-NH index 64abfc3b4d94..64abfc3b4d94 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/PT2-NH +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/PT2-NH diff --git a/tools/testing/selftests/rcutorture/configs/v0.0/ver_functions.sh b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/ver_functions.sh index e8052539af54..5ace37a89780 100644 --- a/tools/testing/selftests/rcutorture/configs/v0.0/ver_functions.sh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v0.0/ver_functions.sh @@ -20,16 +20,14 @@ # # Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com> -# rcutorture_param_n_barrier_cbs bootparam-string -# -# Adds n_barrier_cbs rcutorture module parameter to kernels having it. -rcutorture_param_n_barrier_cbs () { - echo $1 -} - -# rcutorture_param_onoff bootparam-string config-file -# -# Adds onoff rcutorture module parameters to kernels having it. -rcutorture_param_onoff () { - echo $1 +# per_version_boot_params bootparam-string config-file seconds +# +# Adds per-version torture-module parameters to kernels supporting them. +# Which old kernels do not. +per_version_boot_params () { + echo rcutorture.stat_interval=15 \ + rcutorture.shutdown_secs=$3 \ + rcutorture.rcutorture_runnable=1 \ + rcutorture.test_no_idle_hz=1 \ + rcutorture.verbose=1 } diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/CFLIST b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/CFLIST index da4cbc668f2a..da4cbc668f2a 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/CFLIST +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/CFLIST diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/N1-S-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N1-S-T-NH-SD-SMP-HP index d81e11d280aa..d81e11d280aa 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/N1-S-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N1-S-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/N2-2-t-nh-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N2-2-t-nh-sd-SMP-hp index 02e418572b1b..02e418572b1b 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/N2-2-t-nh-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N2-2-t-nh-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/N3-3-T-nh-SD-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N3-3-T-nh-SD-SMP-hp index b3100f69c8cf..b3100f69c8cf 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/N3-3-T-nh-SD-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N3-3-T-nh-SD-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/N4-A-t-NH-sd-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N4-A-t-NH-sd-SMP-HP index c56b44530725..c56b44530725 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/N4-A-t-NH-sd-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N4-A-t-NH-sd-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/N5-U-T-NH-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N5-U-T-NH-sd-SMP-hp index 90d924fea9e9..90d924fea9e9 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/N5-U-T-NH-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N5-U-T-NH-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/N6---t-nh-SD-smp-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N6---t-nh-SD-smp-hp index 0ccc36d72738..0ccc36d72738 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/N6---t-nh-SD-smp-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N6---t-nh-SD-smp-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/N7-4-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N7-4-T-NH-SD-SMP-HP index 3f640cf84973..3f640cf84973 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/N7-4-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N7-4-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/N8-2-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N8-2-T-NH-SD-SMP-HP index 285da2dd8ac3..285da2dd8ac3 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/N8-2-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/N8-2-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/NT1-nh b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/NT1-nh index 023f312a931c..023f312a931c 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/NT1-nh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/NT1-nh diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/NT3-NH b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/NT3-NH index 6fd0235dae73..6fd0235dae73 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/NT3-NH +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/NT3-NH diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P1-S-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P1-S-T-NH-SD-SMP-HP index 9647c44cf4b7..9647c44cf4b7 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P1-S-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P1-S-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P2-2-t-nh-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P2-2-t-nh-sd-SMP-hp index 0f3b667d2a9f..0f3b667d2a9f 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P2-2-t-nh-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P2-2-t-nh-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P3-3-T-nh-SD-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P3-3-T-nh-SD-SMP-hp index b035e141bf2a..b035e141bf2a 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P3-3-T-nh-SD-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P3-3-T-nh-SD-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P4-A-t-NH-sd-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P4-A-t-NH-sd-SMP-HP index 3ccf6a9447f5..3ccf6a9447f5 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P4-A-t-NH-sd-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P4-A-t-NH-sd-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P5-U-T-NH-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P5-U-T-NH-sd-SMP-hp index ef624ce73d8e..ef624ce73d8e 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P5-U-T-NH-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P5-U-T-NH-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P6---t-nh-SD-smp-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P6---t-nh-SD-smp-hp index f4c9175828bf..f4c9175828bf 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P6---t-nh-SD-smp-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P6---t-nh-SD-smp-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP index 77a8c5b75763..77a8c5b75763 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP-all b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-all index 0eecebc6e95f..0eecebc6e95f 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP-all +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-all diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP-none b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-none index 0eecebc6e95f..0eecebc6e95f 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-HP-none +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-HP-none diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-hp index 588bc70420cd..588bc70420cd 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/P7-4-T-NH-SD-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/P7-4-T-NH-SD-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/PT1-nh b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/PT1-nh index e3361c3894a1..e3361c3894a1 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/PT1-nh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/PT1-nh diff --git a/tools/testing/selftests/rcutorture/configs/v3.12/PT2-NH b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/PT2-NH index 64abfc3b4d94..64abfc3b4d94 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.12/PT2-NH +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.12/PT2-NH diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/CFLIST b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/CFLIST index 18223947bbcb..18223947bbcb 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/CFLIST +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/CFLIST diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/N1-S-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N1-S-T-NH-SD-SMP-HP index d81e11d280aa..d81e11d280aa 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/N1-S-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N1-S-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/N2-2-t-nh-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N2-2-t-nh-sd-SMP-hp index 02e418572b1b..02e418572b1b 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/N2-2-t-nh-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N2-2-t-nh-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/N3-3-T-nh-SD-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N3-3-T-nh-SD-SMP-hp index b3100f69c8cf..b3100f69c8cf 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/N3-3-T-nh-SD-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N3-3-T-nh-SD-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/N4-A-t-NH-sd-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N4-A-t-NH-sd-SMP-HP index c56b44530725..c56b44530725 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/N4-A-t-NH-sd-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N4-A-t-NH-sd-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/N5-U-T-NH-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N5-U-T-NH-sd-SMP-hp index 90d924fea9e9..90d924fea9e9 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/N5-U-T-NH-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/N5-U-T-NH-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/NT1-nh b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/NT1-nh index 023f312a931c..023f312a931c 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/NT1-nh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/NT1-nh diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/NT3-NH b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/NT3-NH index 6fd0235dae73..6fd0235dae73 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/NT3-NH +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/NT3-NH diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/P1-S-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P1-S-T-NH-SD-SMP-HP index 9647c44cf4b7..9647c44cf4b7 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/P1-S-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P1-S-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/P2-2-t-nh-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P2-2-t-nh-sd-SMP-hp index 0f3b667d2a9f..0f3b667d2a9f 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/P2-2-t-nh-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P2-2-t-nh-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/P3-3-T-nh-SD-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P3-3-T-nh-SD-SMP-hp index b035e141bf2a..b035e141bf2a 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/P3-3-T-nh-SD-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P3-3-T-nh-SD-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/P4-A-t-NH-sd-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P4-A-t-NH-sd-SMP-HP index 3ccf6a9447f5..3ccf6a9447f5 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/P4-A-t-NH-sd-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P4-A-t-NH-sd-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/P5-U-T-NH-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P5-U-T-NH-sd-SMP-hp index ef624ce73d8e..ef624ce73d8e 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/P5-U-T-NH-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/P5-U-T-NH-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/PT1-nh b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/PT1-nh index e3361c3894a1..e3361c3894a1 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/PT1-nh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/PT1-nh diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/PT2-NH b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/PT2-NH index 64abfc3b4d94..64abfc3b4d94 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/PT2-NH +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/PT2-NH diff --git a/tools/testing/selftests/rcutorture/configs/ver_functions.sh b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/ver_functions.sh index 5e40eadea777..bae55692ce6e 100644 --- a/tools/testing/selftests/rcutorture/configs/ver_functions.sh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.3/ver_functions.sh @@ -20,18 +20,6 @@ # # Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com> -# rcutorture_param_n_barrier_cbs bootparam-string -# -# Adds n_barrier_cbs rcutorture module parameter to kernels having it. -rcutorture_param_n_barrier_cbs () { - if echo $1 | grep -q "rcutorture\.n_barrier_cbs" - then - echo $1 - else - echo $1 rcutorture.n_barrier_cbs=4 - fi -} - # rcutorture_param_onoff bootparam-string config-file # # Adds onoff rcutorture module parameters to kernels having it. @@ -39,8 +27,18 @@ rcutorture_param_onoff () { if ! bootparam_hotplug_cpu "$1" && configfrag_hotplug_cpu "$2" then echo CPU-hotplug kernel, adding rcutorture onoff. 1>&2 - echo $1 rcutorture.onoff_interval=3 rcutorture.onoff_holdoff=30 - else - echo $1 + echo rcutorture.onoff_interval=3 rcutorture.onoff_holdoff=30 fi } + +# per_version_boot_params bootparam-string config-file seconds +# +# Adds per-version torture-module parameters to kernels supporting them. +per_version_boot_params () { + echo $1 `rcutorture_param_onoff "$1" "$2"` \ + rcutorture.stat_interval=15 \ + rcutorture.shutdown_secs=$3 \ + rcutorture.rcutorture_runnable=1 \ + rcutorture.test_no_idle_hz=1 \ + rcutorture.verbose=1 +} diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/CFLIST b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/CFLIST index 18223947bbcb..18223947bbcb 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/CFLIST +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/CFLIST diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/N1-S-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N1-S-T-NH-SD-SMP-HP index d81e11d280aa..d81e11d280aa 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/N1-S-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N1-S-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/N2-2-t-nh-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N2-2-t-nh-sd-SMP-hp index 02e418572b1b..02e418572b1b 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/N2-2-t-nh-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N2-2-t-nh-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/N3-3-T-nh-SD-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N3-3-T-nh-SD-SMP-hp index b3100f69c8cf..b3100f69c8cf 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/N3-3-T-nh-SD-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N3-3-T-nh-SD-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/N4-A-t-NH-sd-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N4-A-t-NH-sd-SMP-HP index c56b44530725..c56b44530725 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/N4-A-t-NH-sd-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N4-A-t-NH-sd-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/N5-U-T-NH-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N5-U-T-NH-sd-SMP-hp index 90d924fea9e9..90d924fea9e9 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/N5-U-T-NH-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/N5-U-T-NH-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/NT1-nh b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/NT1-nh index 023f312a931c..023f312a931c 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/NT1-nh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/NT1-nh diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/NT3-NH b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/NT3-NH index 6fd0235dae73..6fd0235dae73 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/NT3-NH +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/NT3-NH diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/P1-S-T-NH-SD-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P1-S-T-NH-SD-SMP-HP index 9647c44cf4b7..9647c44cf4b7 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/P1-S-T-NH-SD-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P1-S-T-NH-SD-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/P2-2-t-nh-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P2-2-t-nh-sd-SMP-hp index 0f3b667d2a9f..0f3b667d2a9f 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/P2-2-t-nh-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P2-2-t-nh-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/P3-3-T-nh-SD-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P3-3-T-nh-SD-SMP-hp index b035e141bf2a..b035e141bf2a 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/P3-3-T-nh-SD-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P3-3-T-nh-SD-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/P4-A-t-NH-sd-SMP-HP b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P4-A-t-NH-sd-SMP-HP index 3ccf6a9447f5..3ccf6a9447f5 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/P4-A-t-NH-sd-SMP-HP +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P4-A-t-NH-sd-SMP-HP diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/P5-U-T-NH-sd-SMP-hp b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P5-U-T-NH-sd-SMP-hp index ef624ce73d8e..ef624ce73d8e 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/P5-U-T-NH-sd-SMP-hp +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/P5-U-T-NH-sd-SMP-hp diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/PT1-nh b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/PT1-nh index e3361c3894a1..e3361c3894a1 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/PT1-nh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/PT1-nh diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/PT2-NH b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/PT2-NH index 64abfc3b4d94..64abfc3b4d94 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/PT2-NH +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/PT2-NH diff --git a/tools/testing/selftests/rcutorture/configs/v3.5/ver_functions.sh b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/ver_functions.sh index 6a5f13aab44d..8977d8d31b19 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.5/ver_functions.sh +++ b/tools/testing/selftests/rcutorture/configs/rcu/v3.5/ver_functions.sh @@ -26,9 +26,9 @@ rcutorture_param_n_barrier_cbs () { if echo $1 | grep -q "rcutorture\.n_barrier_cbs" then - echo $1 + : else - echo $1 rcutorture.n_barrier_cbs=4 + echo rcutorture.n_barrier_cbs=4 fi } @@ -38,9 +38,20 @@ rcutorture_param_n_barrier_cbs () { rcutorture_param_onoff () { if ! bootparam_hotplug_cpu "$1" && configfrag_hotplug_cpu "$2" then - echo CPU-hotplug kernel, adding rcutorture onoff. - echo $1 rcutorture.onoff_interval=3 rcutorture.onoff_holdoff=30 - else - echo $1 + echo CPU-hotplug kernel, adding rcutorture onoff. 1>&2 + echo rcutorture.onoff_interval=3 rcutorture.onoff_holdoff=30 fi } + +# per_version_boot_params bootparam-string config-file seconds +# +# Adds per-version torture-module parameters to kernels supporting them. +per_version_boot_params () { + echo $1 `rcutorture_param_onoff "$1" "$2"` \ + `rcutorture_param_n_barrier_cbs "$1"` \ + rcutorture.stat_interval=15 \ + rcutorture.shutdown_secs=$3 \ + rcutorture.rcutorture_runnable=1 \ + rcutorture.test_no_idle_hz=1 \ + rcutorture.verbose=1 +} diff --git a/tools/testing/selftests/rcutorture/configs/v3.3/ver_functions.sh b/tools/testing/selftests/rcutorture/configs/rcu/ver_functions.sh index c37432f3572c..8977d8d31b19 100644 --- a/tools/testing/selftests/rcutorture/configs/v3.3/ver_functions.sh +++ b/tools/testing/selftests/rcutorture/configs/rcu/ver_functions.sh @@ -24,7 +24,12 @@ # # Adds n_barrier_cbs rcutorture module parameter to kernels having it. rcutorture_param_n_barrier_cbs () { - echo $1 + if echo $1 | grep -q "rcutorture\.n_barrier_cbs" + then + : + else + echo rcutorture.n_barrier_cbs=4 + fi } # rcutorture_param_onoff bootparam-string config-file @@ -33,9 +38,20 @@ rcutorture_param_n_barrier_cbs () { rcutorture_param_onoff () { if ! bootparam_hotplug_cpu "$1" && configfrag_hotplug_cpu "$2" then - echo CPU-hotplug kernel, adding rcutorture onoff. - echo $1 rcutorture.onoff_interval=3 rcutorture.onoff_holdoff=30 - else - echo $1 + echo CPU-hotplug kernel, adding rcutorture onoff. 1>&2 + echo rcutorture.onoff_interval=3 rcutorture.onoff_holdoff=30 fi } + +# per_version_boot_params bootparam-string config-file seconds +# +# Adds per-version torture-module parameters to kernels supporting them. +per_version_boot_params () { + echo $1 `rcutorture_param_onoff "$1" "$2"` \ + `rcutorture_param_n_barrier_cbs "$1"` \ + rcutorture.stat_interval=15 \ + rcutorture.shutdown_secs=$3 \ + rcutorture.rcutorture_runnable=1 \ + rcutorture.test_no_idle_hz=1 \ + rcutorture.verbose=1 +} diff --git a/tools/testing/selftests/rcutorture/doc/TREE_RCU-Kconfig.txt b/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt index adbb76cffb49..adbb76cffb49 100644 --- a/tools/testing/selftests/rcutorture/doc/TREE_RCU-Kconfig.txt +++ b/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt |