From: Andrew Morton <akpm@linux-foundation.org>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: liml@rtr.ca, lkml@rtr.ca, matthew@wil.cx,
linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-mm@kvack.org,
Mel Gorman <mel@csn.ul.ie>
Subject: Re: QUEUE_FLAG_CLUSTER: not working in 2.6.24 ?
Date: Thu, 13 Dec 2007 14:02:07 -0800 [thread overview]
Message-ID: <20071213140207.111f94e2.akpm@linux-foundation.org> (raw)
In-Reply-To: <20071213200958.GK10104@kernel.dk>
On Thu, 13 Dec 2007 21:09:59 +0100
Jens Axboe <jens.axboe@oracle.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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next parent reply other threads:[~2007-12-13 22:02 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20071213185326.GQ26334@parisc-linux.org>
[not found] ` <4761821F.3050602@rtr.ca>
[not found] ` <20071213192633.GD10104@kernel.dk>
[not found] ` <4761883A.7050908@rtr.ca>
[not found] ` <476188C4.9030802@rtr.ca>
[not found] ` <20071213193937.GG10104@kernel.dk>
[not found] ` <47618B0B.8020203@rtr.ca>
[not found] ` <20071213195350.GH10104@kernel.dk>
[not found] ` <20071213200219.GI10104@kernel.dk>
[not found] ` <476190BE.9010405@rtr.ca>
[not found] ` <20071213200958.GK10104@kernel.dk>
2007-12-13 22:02 ` Andrew Morton [this message]
2007-12-13 22:15 ` QUEUE_FLAG_CLUSTER: not working in 2.6.24 ? James Bottomley
2007-12-13 22:29 ` Andrew Morton
2007-12-13 22:33 ` Mark Lord
2007-12-13 23:13 ` Mark Lord
2007-12-14 0:05 ` Mark Lord
2007-12-14 0:30 ` Mark Lord
2007-12-14 0:37 ` Andrew Morton
2007-12-14 0:42 ` Mark Lord
2007-12-14 0:46 ` [PATCH] fix page_alloc for larger I/O segments (improved) Mark Lord
2007-12-14 0:57 ` James Bottomley
2007-12-14 1:11 ` Andrew Morton
2007-12-14 2:23 ` Mark Lord
2007-12-14 17:42 ` Mel Gorman
2007-12-14 18:07 ` Mark Lord
2007-12-16 21:56 ` Mel Gorman
2007-12-14 18:13 ` Matthew Wilcox
2007-12-14 18:30 ` Mark Lord
2007-12-20 22:37 ` Matthew Wilcox
2007-12-14 0:47 ` QUEUE_FLAG_CLUSTER: not working in 2.6.24 ? Mark Lord
2007-12-14 11:50 ` Mel Gorman
2007-12-14 13:57 ` Mark Lord
2007-12-14 0:40 ` [PATCH] fix page_alloc for larger I/O segments Mark Lord
2007-12-14 1:03 ` Andrew Morton
2007-12-14 4:00 ` Matthew Wilcox
2007-12-15 1:09 ` QUEUE_FLAG_CLUSTER: not working in 2.6.24 ? Mel Gorman
2007-12-15 2:02 ` Andrew Morton
2007-12-15 5:55 ` Matt Mackall
2007-12-16 21:55 ` Mel Gorman
2007-12-17 19:24 ` Randy Dunlap
2007-12-18 2:42 ` Matt Mackall
2007-12-13 22:17 ` Jens Axboe
2007-12-13 22:02 ` VM allocates pages in reverse order again Matthew Wilcox
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