linux-kernel - Re: [PATCH 2/4] nohz: Synchronize sleep time stats with seqlock

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Message-ID: <20130818214029.GC22640@somewhere>
Date:	Sun, 18 Aug 2013 23:40:30 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Fernando Luis Vazquez Cao <fernando_b1@....ntt.co.jp>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 2/4] nohz: Synchronize sleep time stats with seqlock

On Sun, Aug 18, 2013 at 06:54:00PM +0200, Oleg Nesterov wrote:
> On 08/16, Frederic Weisbecker wrote:
> >
> > This fixes a reported bug where non-monotonic sleeptime stats are returned by /proc/stat
> > when it is frequently read.
> 
> Plus it fixes the problems with 32bit machines reading u64 values.

Ah indeed.

> 
> But perhaps the changelog should mention other races we discussed.

Agreed, I'll detail that.

thanks.

> 
> Oleg.
> 
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