linux-kernel - Re: [PATCH 6/7] perf/bench-futex, requeue: Robustify futex

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Message-ID: <YRFCeLsjuIP321EZ@kernel.org>
Date:   Mon, 9 Aug 2021 11:58:00 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 6/7] perf/bench-futex, requeue: Robustify futex_wait()
 handling

Em Sun, Aug 08, 2021 at 09:33:00PM -0700, Davidlohr Bueso escreveu:
> Do not assume success and account for EAGAIN or any other return value,
> however unlikely.

Thanks, applied.

- Arnaldo

 
> Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
> ---
>  tools/perf/bench/futex-requeue.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/bench/futex-requeue.c b/tools/perf/bench/futex-requeue.c
> index 80f40ee92b53..e4892ba6864f 100644
> --- a/tools/perf/bench/futex-requeue.c
> +++ b/tools/perf/bench/futex-requeue.c
> @@ -76,6 +76,8 @@ static void print_summary(void)
>  
>  static void *workerfn(void *arg __maybe_unused)
>  {
> +	int ret;
> +
>  	pthread_mutex_lock(&thread_lock);
>  	threads_starting--;
>  	if (!threads_starting)
> @@ -83,7 +85,18 @@ 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;
>  }
>  
> -- 
> 2.26.2
> 

-- 

- Arnaldo