From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Jens Axboe <jens.axboe@oracle.com>,
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 17:15:06 -0500 [thread overview]
Message-ID: <1197584106.3154.55.camel@localhost.localdomain> (raw)
In-Reply-To: <20071213140207.111f94e2.akpm@linux-foundation.org>
On Thu, 2007-12-13 at 14:02 -0800, Andrew Morton wrote:
> 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.
The simple way seems to be to malloc a large area, touch every page and
then look at the physical pages assigned ... they now mostly seem to be
descending in physical address.
James
next prev parent reply other threads:[~2007-12-13 22:15 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-13 18:36 QUEUE_FLAG_CLUSTER: not working in 2.6.24 ? Mark Lord
2007-12-13 18:37 ` Mark Lord
2007-12-13 18:42 ` Matthew Wilcox
2007-12-13 18:46 ` James Bottomley
2007-12-13 18:48 ` Mark Lord
2007-12-13 18:53 ` Matthew Wilcox
2007-12-13 19:03 ` Mark Lord
2007-12-13 19:26 ` Jens Axboe
2007-12-13 19:30 ` Mark Lord
2007-12-13 19:32 ` Mark Lord
2007-12-13 19:39 ` Jens Axboe
2007-12-13 19:42 ` Mark Lord
2007-12-13 19:53 ` Jens Axboe
2007-12-13 19:59 ` Mark Lord
2007-12-13 20:05 ` Jens Axboe
2007-12-13 20:02 ` Jens Axboe
2007-12-13 20:06 ` Mark Lord
2007-12-13 20:09 ` Jens Axboe
2007-12-13 20:14 ` Mark Lord
2007-12-13 20:18 ` Mark Lord
2007-12-13 20:21 ` Jens Axboe
2007-12-13 22:02 ` Andrew Morton
2007-12-13 22:15 ` James Bottomley [this message]
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
2007-12-13 22:17 ` QUEUE_FLAG_CLUSTER: not working in 2.6.24 ? Jens Axboe
2007-12-13 22:02 ` VM allocates pages in reverse order again Matthew Wilcox
2007-12-13 19:37 ` QUEUE_FLAG_CLUSTER: not working in 2.6.24 ? Jens Axboe
2007-12-13 19:53 ` Mark Lord
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