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

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Message-ID: <aFmZl-SUT85Im8BJ@google.com>
Date: Mon, 23 Jun 2025 11:14:47 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, 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

On Mon, Jun 23, 2025 at 11:05:41AM -0700, Ian Rogers wrote:
> On Mon, Jun 23, 2025 at 10:45 AM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> >
> > On Mon, Jun 23, 2025 at 08:12:47AM -0700, Ian Rogers wrote:
> > > On Fri, Jun 20, 2025 at 12:36 PM Namhyung Kim <namhyung@...nel.org> wrote:
> > > > 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.
> >
> > > we could do that but in the glibc man page it says:
> > > https://man7.org/linux/man-pages/man2/prctl.2.html
> > > ```
> > > #include <linux/prctl.h>  /* Definition of PR_* constants */
> > > #include <sys/prctl.h>
> > > ```
> >
> > > It'd be nice to think musl was slowly getting fixed. I notice we're
> >
> > Sebastian reported on the musl libc, its maintainer replied:
> >
> > https://www.openwall.com/lists/musl/2025/06/12/11
> 
> Ugh. I'm not sure how we're expected to resolve this and have glibc
> and musl be happy without basically not trusting libc.

Maybe pthread_setname_np()?  It seems musl also implemented it.

Thanks,
Namhyung