linux-kernel - Re: QUEUE_FLAG_CLUSTER: not working in 2.6.24 ?

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Message-Id: <20071213140207.111f94e2.akpm@linux-foundation.org>
Date:	Thu, 13 Dec 2007 14:02:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	liml@....ca, lkml@....ca, matthew@....cx,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-mm@...ck.org,
	Mel Gorman <mel@....ul.ie>
Subject: Re: QUEUE_FLAG_CLUSTER: not working in 2.6.24 ?

On Thu, 13 Dec 2007 21:09:59 +0100
Jens Axboe <jens.axboe@...cle.com> wrote:

>
> OK, it's a vm issue,

cc linux-mm and probable culprit.

>  I have tens of thousand "backward" pages after a
> boot - IOW, bvec->bv_page is the page before bvprv->bv_page, not
> reverse. So it looks like that bug got reintroduced.

Bill Irwin fixed this a couple of years back: changed the page allocator so
that it mostly hands out pages in ascending physical-address order.

I guess we broke that, quite possibly in Mel's page allocator rework.

It would help if you could provide us with a simple recipe for
demonstrating this problem, please.

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