linux-kernel - Re: [tip:perf/core] tracing: Only trace sched

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Message-ID: <20101222161232.GA20358@elte.hu>
Date:	Wed, 22 Dec 2010 17:12:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	srostedt@...hat.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] tracing: Only trace sched_wakeup if it actually
 work something up


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Wed, 2010-12-22 at 14:19 +0100, Peter Zijlstra wrote:
> > On Wed, 2010-12-22 at 13:16 +0000, tip-bot for Steven Rostedt wrote:
> > > Commit-ID:  14bc7a06c6175cfa8070a5f5022210b648c3e0a7
> > > Gitweb:     http://git.kernel.org/tip/14bc7a06c6175cfa8070a5f5022210b648c3e0a7
> > > Author:     Steven Rostedt <srostedt@...hat.com>
> > > AuthorDate: Thu, 2 Dec 2010 16:56:14 -0500
> > > Committer:  Steven Rostedt <rostedt@...dmis.org>
> > > CommitDate: Fri, 3 Dec 2010 10:46:59 -0500
> > > 
> > > tracing: Only trace sched_wakeup if it actually work something up
> > > 
> > > Currently the tracepoint sched_wakeup traces the wakeup event even
> > > if the wakeup failed to wake anything up. This is quite stupid
> > > but it happens because we did not want to add a conditional
> > > to the core kernel code that would just slow down the wakeup events.
> > > 
> > > This patch changes the wakeup tracepoints to use the
> > > 
> > >  DEFINE_EVENT_CONDITIONAL()
> > > 
> > > to test the "success" parameter and will only trace the event if
> > > the wakeup was successfull.
> > > 
> > > The success field in the tracepoint is removed since it is no
> > > longer needed.
> > 
> > I NAKed this, its stupid.
> 
> I wouldn't call it stupid, but unnecessary, yes.
> 
> Anyway, it was the last patch of the series.
> 
> Ingo, can you revert this last patch?

Yeah, done.

Thanks guys,

	Ingo
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