linux-kernel - Re: [PATCH 17/22 -v7] mcount tracer for wakeup latency timings.

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Message-ID: <Pine.LNX.4.58.0801300817260.29020@gandalf.stny.rr.com>
Date:	Wed, 30 Jan 2008 08:18:19 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Bird <tim.bird@...sony.com>,
	Sam Ravnborg <sam@...nborg.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	John Stultz <johnstul@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 17/22 -v7] mcount tracer for wakeup latency timings.


On Wed, 30 Jan 2008, Peter Zijlstra wrote:

>
> On Tue, 2008-01-29 at 22:15 -0500, Steven Rostedt wrote:
>
> > +static void notrace __wakeup_reset(struct tracing_trace *tr)
[...]
> > +
> > +	wakeup_task = NULL;
> > +
> > +	/*
> > +	 * Don't let the trace_enabled = 1 show up before
> > +	 * the wakeup_task is reset.
> > +	 */
> > +	smp_wmb();
> > +}
>
> Another un-balanced barrier.


This one is probably me being paranoid, but even so, it should have a
pair.  Will fix.

-- Steve

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