linux-kernel - Re: [PATCH] mm: evict streaming IO cache first

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Message-ID: <491F704A.3010201@redhat.com>
Date:	Sat, 15 Nov 2008 19:58:50 -0500
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Gene Heskett <gene.heskett@...il.com>
Subject: Re: [PATCH] mm: evict streaming IO cache first

KOSAKI Motohiro wrote:
> Hi Andrew,
> 
> I think we need this patch at 2.6.28.

I agree.  I thought we would need this patch from right before
the time I wrote it, but we had no good workload to demonstrate
it at the time.

Gene Heskett found that the problem happens on his system and
the patch fixes is.

> Can this thinking get acception?

One of the reasons that I could not find a justification for
the patch is that all the benchmarks that I tried were
unaffected by it.  This makes me believe that the risk of
performance regressions is low, while the patch does fix a
real performance bug for Gene's desktop.

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