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| author | Davidlohr Bueso <dave@stgolabs.net> | 2015-07-07 08:55:53 (GMT) |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-07-20 20:49:51 (GMT) |
| commit | d2f3f5d2e9cae6e73f9642a5ddc8c8a07c35e79b (patch) | |
| tree | 76994d160a27adaab0a7263c2697afdcae4f5df5 /tools/perf/builtin-bench.c | |
| parent | 52c0a18b9010fb19d10889e8a00aa784197d357c (diff) | |
| download | linux-d2f3f5d2e9cae6e73f9642a5ddc8c8a07c35e79b.tar.xz | |
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/builtin-bench.c')
| -rw-r--r-- | tools/perf/builtin-bench.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c index b5314e4..f67934d 100644 --- a/tools/perf/builtin-bench.c +++ b/tools/perf/builtin-bench.c @@ -60,6 +60,8 @@ static struct bench futex_benchmarks[] = { { "wake", "Benchmark for futex wake calls", bench_futex_wake }, { "wake-parallel", "Benchmark for parallel futex wake calls", bench_futex_wake_parallel }, { "requeue", "Benchmark for futex requeue calls", bench_futex_requeue }, + /* pi-futexes */ + { "lock-pi", "Benchmark for futex lock_pi calls", bench_futex_lock_pi }, { "all", "Test all futex benchmarks", NULL }, { NULL, NULL, NULL } }; |