linux-kernel - Re: [PATCH v2 1/2] perf test workload noploop: Name the noploop process

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Message-ID: <aFW4VJtk96JD865U@google.com>
Date: Fri, 20 Jun 2025 12:36:52 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 1/2] perf test workload noploop: Name the noploop
 process

Hi Ian,

On Wed, Jun 18, 2025 at 05:20:33PM -0700, Ian Rogers wrote:
> Name the noploop process "perf-noploop" so that tests can easily check
> for its existence.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/tests/workloads/noploop.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/tests/workloads/noploop.c b/tools/perf/tests/workloads/noploop.c
> index 940ea5910a84..8b954d466083 100644
> --- a/tools/perf/tests/workloads/noploop.c
> +++ b/tools/perf/tests/workloads/noploop.c
> @@ -2,6 +2,8 @@
>  #include <stdlib.h>
>  #include <signal.h>
>  #include <unistd.h>
> +#include <linux/prctl.h>
> +#include <sys/prctl.h>

I'm afraid it'd introduce a build failure on musl.  Please see

https://lore.kernel.org/linux-perf-users/20250611092542.F4ooE2FL@linutronix.de/

I think <sys/prctl.h> would be enough.

Thanks,
Namhyung


>  #include <linux/compiler.h>
>  #include "../tests.h"
>  
> @@ -16,6 +18,7 @@ static int noploop(int argc, const char **argv)
>  {
>  	int sec = 1;
>  
> +	prctl(PR_SET_NAME, "perf-noploop");
>  	if (argc > 0)
>  		sec = atoi(argv[0]);
>  
> -- 
> 2.50.0.rc2.701.gf1e915cc24-goog
>