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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2009-12-02 21:10:16 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-03 11:35:27 +0100 |
| commit | 8bfb2f8e655b9d0c45fde679fcd5fd97e34513db (patch) | |
| tree | 2a37bd385f3a6012ced116b1ff8d8cd3b8efb289 | |
| parent | rcu: Add expedited grace-period support for preemptible RCU (diff) | |
| download | linux-8bfb2f8e655b9d0c45fde679fcd5fd97e34513db.tar.xz linux-8bfb2f8e655b9d0c45fde679fcd5fd97e34513db.zip | |
rcu: Make RCU's CPU-stall detector be default
The RCU_CPU_STALL_DETECTOR costs almost nothing and has located
some bugs that might otherwise have been difficult to track
down. Make it be default for the TREE RCU implementations.
The vmlinux size impact is limited (on 64-bit x86 defconfig):
text data bss dec hex filename
8440248 1260076 995588 10695912 a334e8 vmlinux.before
8440774 1260060 995588 10696422 a336e6 vmlinux.after
+526 bytes - acceptable default cost.
For RAM starved systems, TINY_RCU does not support CPU-stall detection
and is much smaller, but then again it is a uniprocessor...
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <12597846162906-git-send-email->
[ v2: added image size calculations to the changelog ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | lib/Kconfig.debug | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 891155817bc6..50e0e78259e7 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -749,7 +749,7 @@ config RCU_TORTURE_TEST_RUNNABLE config RCU_CPU_STALL_DETECTOR bool "Check for stalled CPUs delaying RCU grace periods" depends on TREE_RCU || TREE_PREEMPT_RCU - default n + default y help This option causes RCU to printk information on which CPUs are delaying the current grace period, but only when |