From: Andrew Morton <akpm@linux-foundation.org>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: 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@csn.ul.ie
Subject: Re: QUEUE_FLAG_CLUSTER: not working in 2.6.24 ?
Date: Thu, 13 Dec 2007 14:29:35 -0800 [thread overview]
Message-ID: <20071213142935.47ff19d9.akpm@linux-foundation.org> (raw)
In-Reply-To: <1197584106.3154.55.camel@localhost.localdomain>
On Thu, 13 Dec 2007 17:15:06 -0500
James Bottomley <James.Bottomley@HansenPartnership.com> wrote:
>
> 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.
>
OIC. -mm's /proc/pid/pagemap can be used to get the pfn's...
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next prev parent reply other threads:[~2007-12-13 22:29 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 ` QUEUE_FLAG_CLUSTER: not working in 2.6.24 ? Andrew Morton
2007-12-13 22:15 ` James Bottomley
2007-12-13 22:29 ` Andrew Morton [this message]
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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