Re: QUEUE_FLAG_CLUSTER: not working in 2.6.24 ?

[Andrew Morton <akpm@linux-foundation.org>]

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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