linux-kernel - Re: [PATCH,RFC] perf: panic due to inclied cpu context task

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Message-ID: <20110330155238.GA5455@redhat.com>
Date:	Wed, 30 Mar 2011 17:52:38 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH,RFC] perf: panic due to inclied cpu context task_ctx
	value

On 03/30, Peter Zijlstra wrote:
>
> On Wed, 2011-03-30 at 17:32 +0200, Oleg Nesterov wrote:
> > > +#ifdef HAVE_JUMP_LABEL
> > > +static inline
> > > +void perf_sched_events_inc(void)
> > > +{
> > > +     jump_label_inc(&perf_sched_events_out);
> > > +     smp_mb__after_atomic_inc();
> > > +     jump_label_inc(&perf_sched_events_in);
> > > +}
> >
> > probably smp_mb__after_atomic_inc() needs a comment...
>
> You don't need it, jump_label_inc() uses atomic_add_return() which
> implies a full mb.

Yes, but only if HAVE_JUMP_LABEL.

Oleg.

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