linux-kernel - Re: [PATCH] fix page_alloc for larger I/O segments (improved)

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Date:	Fri, 14 Dec 2007 11:13:40 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Mark Lord <liml@....ca>, Andrew Morton <akpm@...ux-foundation.org>,
	James.Bottomley@...senPartnership.com, jens.axboe@...cle.com,
	lkml@....ca, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] fix page_alloc for larger I/O segments (improved)

On Fri, Dec 14, 2007 at 05:42:37PM +0000, Mel Gorman wrote:
> Regrettably this interferes with anti-fragmentation because the "next" page
> on the list on return from rmqueue_bulk is not guaranteed to be of the right
> mobility type. I fixed it as an additional patch but it adds additional cost
> that should not be necessary and it's visible in microbenchmark results on
> at least one machine.

Is this patch to be preferred to the one Andrew Morton posted to do
list_for_each_entry_reverse?

I'll send it to our DB team to see if this improves our numbers at all.

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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