linux-kernel - Re: [PATCH v1 5/6] mm: make vmstat

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Message-ID: <CAOtvUMfGkjTwPX7fk_uBvFyd2EpcoksLJoNET-6Ox6y=JN+LeA@mail.gmail.com>
Date:	Wed, 9 May 2012 17:26:08 +0300
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, John Stultz <johnstul@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, Mike Frysinger <vapier@...too.org>,
	David Rientjes <rientjes@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Frederic Weisbecker <fweisbec@...il.com>, linux-mm@...ck.org
Subject: Re: [PATCH v1 5/6] mm: make vmstat_update periodic run conditional

On Tue, May 8, 2012 at 6:34 PM, Christoph Lameter <cl@...ux.com> wrote:
> On Tue, 8 May 2012, Gilad Ben-Yossef wrote:
>
>> > But this would still mean that the vmstat update thread would run on an
>> > arbitrary cpu. If I have a sacrificial lamb processor for OS processing
>> > then I would expect the vmstat update thread to stick to that processor
>> > and avoid to run on the other processor that I would like to be as free
>> > from OS noise as possible.
>> >
>>
>> OK, what about -
>>
>> - We pick a scapegoat cpu (the first to come up gets the job).
>> - We add a knob to let user designate another cpu for the job.
>> - If scapegoat cpus goes offline, the cpu processing the off lining is
>> the new scapegoat.
>>
>> Does this makes better sense?
>
> Sounds good. The first that comes up. If the cpu is isolated then the
> first non isolated cpu is picked.
>

OK, will do.

Thanks,
Gilad


-- 
Gilad Ben-Yossef
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gilad@...yossef.com
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