linux-kernel - Re: [RFC 5/8] Make writeout during reclaim cpuset aware

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Message-Id: <200701171528.16854.ak@suse.de>
Date:	Wed, 17 Jan 2007 15:28:16 +1100
From:	Andi Kleen <ak@...e.de>
To:	Paul Jackson <pj@....com>
Cc:	clameter@....com, akpm@...l.org, menage@...gle.com,
	linux-kernel@...r.kernel.org, nickpiggin@...oo.com.au,
	linux-mm@...ck.org, dgc@....com
Subject: Re: [RFC 5/8] Make writeout during reclaim cpuset aware

On Wednesday 17 January 2007 15:20, Paul Jackson wrote:
> Andi wrote:
> > Is there a reason this can't be just done by node, ignoring the cpusets?
>
> This suggestion doesn't make a whole lot of sense to me.
>
> We're looking to see if a task has dirtied most of the
> pages in the nodes it is allowed to use.  If it has, then
> we want to start pushing pages to the disk harder, and
> slowing down the tasks writes.
>
> What would it mean to do this per-node?  And why would
> that be better?

With a per node dirty limit you would get essentially the
same effect and it would have the advantage of helping
people who don't configure any cpusets but run on a NUMA 
system.

-Andi
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