linux-kernel - Re: [PATCH] Configurable reclaim batch size

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Message-ID: <20070917215615.685a5378@lappy>
Date:	Mon, 17 Sep 2007 21:56:15 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Mel Gorman <mel@...net.ie>
Subject: Re: [PATCH] Configurable reclaim batch size

On Mon, 17 Sep 2007 10:54:59 -0700 (PDT) Christoph Lameter
<clameter@....com> wrote:

> On Sat, 15 Sep 2007, Peter Zijlstra wrote:
> 
> > It increases the lock hold times though. Otoh it might work out with the
> > lock placement.
> 
> Yeah may be good for NUMA.

Might, I'd just like a _little_ justification for an extra tunable.

> > Do you have any numbers that show this is worthwhile?
> 
> Tried to run AIM7 but the improvements are in the noise. I need a tests 
> that really does large memory allocation and stresses the LRU. I could 
> code something up but then Lee's patch addresses some of the same issues.
> Is there any standard test that shows LRU handling regressions?

hehe, I wish. I was just hoping you'd done this patch as a result of an
actual problem and not a hunch.
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