diff options
| author |   Davidlohr Bueso <dave@stgolabs.net> | 2014-09-29 09:41:07 -0700 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-09-29 15:43:21 -0300 |
| commit | 86c87e13f8a5dffc6cc7b0f37340f815dc172945 (patch) | |
| tree | 4f391df8bf01d696425805dac591696ea9f4471a /tools/perf/bench/futex-hash.c | |
| parent | perf trace: Fix mmap return address truncation to 32-bit (diff) | |
| download | linux-dev-86c87e13f8a5dffc6cc7b0f37340f815dc172945.tar.xz linux-dev-86c87e13f8a5dffc6cc7b0f37340f815dc172945.zip | |
perf bench futex: Support operations for shared futexes
Unlike futex-hash, requeuing and wakeup benchmarks do not support shared
futexes, limiting the usefulness of the programs. Correct this, and
allow using the local -S parameter. The default remains using private
futexes.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Link: http://lkml.kernel.org/r/1412008868-22328-1-git-send-email-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/bench/futex-hash.c')
| -rw-r--r-- | tools/perf/bench/futex-hash.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c index a84206e9c4aa..fc9bebd2cca0 100644 --- a/tools/perf/bench/futex-hash.c +++ b/tools/perf/bench/futex-hash.c @@ -26,6 +26,7 @@ static unsigned int nsecs = 10; /* amount of futexes per thread */ static unsigned int nfutexes = 1024; static bool fshared = false, done = false, silent = false; +static int futex_flag = 0; struct timeval start, end, runtime; static pthread_mutex_t thread_lock; @@ -75,8 +76,7 @@ static void *workerfn(void *arg) * such as internal waitqueue handling, thus enlarging * the critical region protected by hb->lock. */ - ret = futex_wait(&w->futex[i], 1234, NULL, - fshared ? 0 : FUTEX_PRIVATE_FLAG); + ret = futex_wait(&w->futex[i], 1234, NULL, futex_flag); if (!silent && (!ret || errno != EAGAIN || errno != EWOULDBLOCK)) warn("Non-expected futex return call"); @@ -135,6 +135,9 @@ int bench_futex_hash(int argc, const char **argv, if (!worker) goto errmem; + if (!fshared) + futex_flag = FUTEX_PRIVATE_FLAG; + printf("Run summary [PID %d]: %d threads, each operating on %d [%s] futexes for %d secs.\n\n", getpid(), nthreads, nfutexes, fshared ? "shared":"private", nsecs); |