linux-kernel - Re: [PATCH 2/3] relay: Fix race condition which occurs when reading across CPUs.

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Message-ID: <20080617135031.GA10316@Krystal>
Date:	Tue, 17 Jun 2008 09:50:31 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Tom Zanussi <tzanussi@...il.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, righi.andrea@...il.com
Subject: Re: [PATCH 2/3] relay: Fix race condition which occurs when
	reading across CPUs.

* Eduard - Gabriel Munteanu (eduard.munteanu@...ux360.ro) wrote:
> On Tue, 17 Jun 2008 09:10:36 -0400
> Mathieu Desnoyers <compudj@...stal.dyndns.org> wrote:
> 
> > Do you get the same results when not using a buffered read to read
> > /proc/PID/stat ? Also, since the internal proc handle might buffer the
> > information, closing the file and re-opening it after the set affinity
> > would not be a bad idea.
> > 
> > Mathieu
> 
> Tested your suggestions now, looks fine. 5 instances end up on CPU 1,
> one on CPU 0, no errors printed by the application.
> 

Yeah, although using set affinity with CPU hotplug is broken by design.

Mathieu

> 
> 	Eduard
> 

-- 
Mathieu Desnoyers
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