linux-kernel - Re: [PATCH 5/7] perf/bench-futex, requeue: Add --broadcast option

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Date:   Mon, 9 Aug 2021 11:57:03 -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 5/7] perf/bench-futex, requeue: Add --broadcast option

Em Sun, Aug 08, 2021 at 09:32:59PM -0700, Davidlohr Bueso escreveu:
> Such that all threads are requeued to uaddr2 in a single
> futex_cmp_requeue(), unlike the default, which is 1.

Thanks, applied.

- Arnaldo

 
> Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
> ---
>  tools/perf/bench/futex-requeue.c | 4 ++++
>  tools/perf/bench/futex.h         | 1 +
>  2 files changed, 5 insertions(+)
> 
> diff --git a/tools/perf/bench/futex-requeue.c b/tools/perf/bench/futex-requeue.c
> index 88cb7e2a6729..80f40ee92b53 100644
> --- a/tools/perf/bench/futex-requeue.c
> +++ b/tools/perf/bench/futex-requeue.c
> @@ -52,6 +52,7 @@ static const struct option options[] = {
>  	OPT_BOOLEAN( 's', "silent",   &params.silent, "Silent mode: do not display data/details"),
>  	OPT_BOOLEAN( 'S', "shared",   &params.fshared, "Use shared futexes instead of private ones"),
>  	OPT_BOOLEAN( 'm', "mlockall", &params.mlockall, "Lock all current and future memory"),
> +	OPT_BOOLEAN( 'B', "broadcast", &params.broadcast, "Requeue all threads at once"),
>  	OPT_END()
>  };
>  
> @@ -153,6 +154,9 @@ int bench_futex_requeue(int argc, const char **argv)
>  	if (params.nrequeue > params.nthreads)
>  		params.nrequeue = params.nthreads;
>  
> +	if (params.broadcast)
> +		params.nrequeue = params.nthreads;
> +
>  	printf("Run summary [PID %d]: Requeuing %d threads (from [%s] %p to %p), "
>  	       "%d at a time.\n\n",  getpid(), params.nthreads,
>  	       params.fshared ? "shared":"private", &futex1, &futex2, params.nrequeue);
> diff --git a/tools/perf/bench/futex.h b/tools/perf/bench/futex.h
> index 1c8fa469993f..36f158650edf 100644
> --- a/tools/perf/bench/futex.h
> +++ b/tools/perf/bench/futex.h
> @@ -21,6 +21,7 @@ struct bench_futex_parameters {
>  	bool fshared;
>  	bool mlockall;
>  	bool multi; /* lock-pi */
> +	bool broadcast; /* requeue */
>  	unsigned int runtime; /* seconds*/
>  	unsigned int nthreads;
>  	unsigned int nfutexes;
> -- 
> 2.26.2
> 

-- 

- Arnaldo