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| author | Davidlohr Bueso <dave@stgolabs.net> | 2021-08-08 21:33:00 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-08-09 12:00:22 -0300 |
| commit | 6f9661b25b1741b180bdaeb85853905078cfd9d8 (patch) | |
| tree | 708b4bea72991c14a7e55a2705be8c3bead1ec75 /tools/perf/bench/futex-requeue.c | |
| parent | d262e6a93b3ceb3db7e6388d89352801f02c3260 (diff) | |
| download | linux-6f9661b25b1741b180bdaeb85853905078cfd9d8.tar.bz2 | |
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>
Diffstat (limited to 'tools/perf/bench/futex-requeue.c')
| -rw-r--r-- | tools/perf/bench/futex-requeue.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/tools/perf/bench/futex-requeue.c b/tools/perf/bench/futex-requeue.c index 6606569e7ccc..e23a08037de2 100644 --- a/tools/perf/bench/futex-requeue.c +++ b/tools/perf/bench/futex-requeue.c @@ -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; } |