linux-kernel - Re: [RFC PATCH 03/10] perf workqueue: add threadpool start and stop functions

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Date:   Thu, 15 Jul 2021 17:43:58 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Riccardo Mancini <rickyman7@...il.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
Subject: Re: [RFC PATCH 03/10] perf workqueue: add threadpool start and stop
 functions

Em Thu, Jul 15, 2021 at 06:42:16PM +0200, Riccardo Mancini escreveu:
> Hi Arnaldo,
> 
> On Wed, 2021-07-14 at 12:15 -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Jul 13, 2021 at 02:11:14PM +0200, Riccardo Mancini escreveu:
> > > +++ b/tools/perf/util/workqueue/threadpool.c
> > > @@ -4,12 +4,23 @@
> > >  #include <unistd.h>
> > >  #include <errno.h>
> > >  #include <string.h>
> > > +#include <pthread.h>
> > > +#include <signal.h>
> > > +#include <syscall.h>
> > >  #include "debug.h"
> > >  #include "asm/bug.h"
> > >  #include "threadpool.h"
> > >  
> > > +#ifndef HAVE_GETTID
> > > +static inline pid_t gettid(void)
> > > +{
> > > +       return (pid_t)syscall(__NR_gettid);
> > > +}
> > > +#endif

> > Isn't this defined elsewhere? Yeah, when we decide to move it to
> > tools/lib/workqueue/ we'll need it, but for now, reduce patch size.
 
> No, it's just statically defined in tools/perf/jvmti/jvmti_agent.c.
> I saw there is a libc_compat.h header in tools/include/tools, I could put this
> definition there, and remove the one from jvmti_agent.c.

Please, do it as a prep patch.

Thanks,

- Arnaldo