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

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Message-ID: <4762CBB6.5030301@rtr.ca>
Date:	Fri, 14 Dec 2007 13:30:14 -0500
From:	Mark Lord <liml@....ca>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Mel Gorman <mel@....ul.ie>,
	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)

Matthew Wilcox wrote:
> 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?
..

This patch replaces my earlier patch that Andrew has:

-               list_add(&page->lru, list);
+               list_add_tail(&page->lru, list);

Which, in turn, replaced the even-earlier list_for_each_entry_reverse patch.

-ml
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