Re: [PATCH v1 5/6] mm: make vmstat_update periodic run conditional

From: Gilad Ben-Yossef
Date: Wed May 09 2012 - 10:26:10 EST

On Tue, May 8, 2012 at 6:34 PM, Christoph Lameter <cl@xxxxxxxxx> 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.


Gilad Ben-Yossef
Chief Coffee Drinker
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 -- Jean-Baptiste Queru
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