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perf bench futex: Support operations for shared futexes

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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>
This commit is contained in:
Davidlohr Bueso
2014-09-29 09:41:07 -07:00
committed by Arnaldo Carvalho de Melo
parent 2c82c3ad56
commit 86c87e13f8
3 changed files with 30 additions and 16 deletions
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24
tools/perf/bench/futex-requeue.c
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@@ -30,16 +30,18 @@ static u_int32_t futex1 = 0, futex2 = 0;
static unsigned int nrequeue = 1;
static pthread_t *worker;
static bool done = 0, silent = 0;
static bool done = false, silent = false, fshared = false;
static pthread_mutex_t thread_lock;
static pthread_cond_t thread_parent, thread_worker;
static struct stats requeuetime_stats, requeued_stats;
static unsigned int ncpus, threads_starting, nthreads = 0;
static int futex_flag = 0;
static const struct option options[] = {
OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
OPT_UINTEGER('q', "nrequeue", &nrequeue, "Specify amount of threads to requeue at once"),
OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
OPT_END()
};
@@ -70,7 +72,7 @@ static void *workerfn(void *arg __maybe_unused)
pthread_cond_wait(&thread_worker, &thread_lock);
pthread_mutex_unlock(&thread_lock);
futex_wait(&futex1, 0, NULL, FUTEX_PRIVATE_FLAG);
futex_wait(&futex1, 0, NULL, futex_flag);
return NULL;
}
@@ -127,9 +129,12 @@ int bench_futex_requeue(int argc, const char **argv,
if (!worker)
err(EXIT_FAILURE, "calloc");
printf("Run summary [PID %d]: Requeuing %d threads (from %p to %p), "
"%d at a time.\n\n",
getpid(), nthreads, &futex1, &futex2, nrequeue);
if (!fshared)
futex_flag = FUTEX_PRIVATE_FLAG;
printf("Run summary [PID %d]: Requeuing %d threads (from [%s] %p to %p), "
"%d at a time.\n\n", getpid(), nthreads,
fshared ? "shared":"private", &futex1, &futex2, nrequeue);
init_stats(&requeued_stats);
init_stats(&requeuetime_stats);
@@ -156,13 +161,14 @@ int bench_futex_requeue(int argc, const char **argv,
/* Ok, all threads are patiently blocked, start requeueing */
gettimeofday(&start, NULL);
for (nrequeued = 0; nrequeued < nthreads; nrequeued += nrequeue)
for (nrequeued = 0; nrequeued < nthreads; nrequeued += nrequeue) {
/*
* Do not wakeup any tasks blocked on futex1, allowing
* us to really measure futex_wait functionality.
*/
futex_cmp_requeue(&futex1, 0, &futex2, 0, nrequeue,
FUTEX_PRIVATE_FLAG);
futex_cmp_requeue(&futex1, 0, &futex2, 0,
nrequeue, futex_flag);
}
gettimeofday(&end, NULL);
timersub(&end, &start, &runtime);
@@ -175,7 +181,7 @@ int bench_futex_requeue(int argc, const char **argv,
}
/* everybody should be blocked on futex2, wake'em up */
nrequeued = futex_wake(&futex2, nthreads, FUTEX_PRIVATE_FLAG);
nrequeued = futex_wake(&futex2, nthreads, futex_flag);
if (nthreads != nrequeued)
warnx("couldn't wakeup all tasks (%d/%d)", nrequeued, nthreads);