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| author | Davidlohr Bueso <dave@stgolabs.net> | 2015-07-07 10:55:53 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-07-20 22:49:51 +0200 |
| commit | d2f3f5d2e9cae6e73f9642a5ddc8c8a07c35e79b (patch) | |
| tree | 76994d160a27adaab0a7263c2697afdcae4f5df5 /tools/perf/Documentation/perf-bench.txt | |
| parent | perf tools: Fix makefile generation under dash (diff) | |
| download | linux-d2f3f5d2e9cae6e73f9642a5ddc8c8a07c35e79b.tar.xz linux-d2f3f5d2e9cae6e73f9642a5ddc8c8a07c35e79b.zip | |
perf bench futex: Add lock_pi stresser
Allows a way of measuring low level kernel implementation of FUTEX_LOCK_PI and
FUTEX_UNLOCK_PI.
The program comes in two flavors:
(i) single futex (default), all threads contend on the same uaddr. For the
sake of the benchmark, we call into kernel space even when the lock is
uncontended. The kernel will set it to TID, any waters that come in and
contend for the pi futex will be handled respectively by the kernel.
(ii) -M option for multiple futexes, each thread deals with its own futex. This
is a trivial scenario and only measures kernel handling of 0->TID transition.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Mel Gorman <mgorman@suse.de>
Link: http://lkml.kernel.org/r/1436259353.12255.78.camel@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-bench.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-bench.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-bench.txt b/tools/perf/Documentation/perf-bench.txt index bf3d0644bf10..ab632d9fbd7d 100644 --- a/tools/perf/Documentation/perf-bench.txt +++ b/tools/perf/Documentation/perf-bench.txt @@ -216,6 +216,10 @@ Suite for evaluating parallel wake calls. *requeue*:: Suite for evaluating requeue calls. +*lock-pi*:: +Suite for evaluating futex lock_pi calls. + + SEE ALSO -------- linkperf:perf[1] |