linux-kernel - Re: [RFC PATCH v4 1/2] trace,smp: Add tracepoints around remotelly called functions

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Date:   Wed, 14 Jun 2023 01:10:08 -0300
From:   Leonardo Bras Soares Passos <leobras@...hat.com>
To:     Valentin Schneider <vschneid@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Nadav Amit <namit@...are.com>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Yury Norov <yury.norov@...il.com>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v4 1/2] trace,smp: Add tracepoints around remotelly
 called functions

Hello Valentin, thanks for the feedback!

On Tue, May 30, 2023 at 7:36 AM Valentin Schneider <vschneid@...hat.com> wrote:
>
> On 15/05/23 15:30, Leonardo Bras wrote:
> > @@ -375,7 +386,7 @@ static int generic_exec_single(int cpu, call_single_data_t *csd)
> >               csd_lock_record(csd);
> >               csd_unlock(csd);
> >               local_irq_save(flags);
> > -             func(info);
> > +             csd_do_func(func, info, csd);
>
> I'd suggest making this match the local case of
> smp_call_function_many_cond(), IOW pass NULL as the csd when executing
> locally.

Sure, done!

>
> IMO this is required for postprocessing with e.g. synthetic events for CSD
> delivery measurement, otherwise we'll try to match this execution with a
> previous CSD enqueue.
>
> >               csd_lock_record(NULL);
> >               local_irq_restore(flags);
> >               return 0;
>