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perf bench futex, requeue: Robustify futex_wait() handling 

Do not assume success and account for EAGAIN or any other return value,
however unlikely.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/20210809043301.66002-7-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Davidlohr Bueso 2021-08-08 21:33:00 -07:00 committed by Arnaldo Carvalho de Melo
parent d262e6a93b
commit 6f9661b25b
1 changed files with 14 additions and 1 deletions
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15
tools/perf/bench/futex-requeue.c
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@ -77,6 +77,8 @@ static void print_summary(void)
static void *workerfn(void *arg __maybe_unused)
{
int ret;
pthread_mutex_lock(&thread_lock);
threads_starting--;
if (!threads_starting)
@ -84,7 +86,18 @@ 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_flag);
while (1) {
ret = futex_wait(&futex1, 0, NULL, futex_flag);
if (!ret)
break;
if (ret && errno != EAGAIN) {
if (!params.silent)
warn("futex_wait");
break;
}
}
return NULL;
}