lkml.org 
[lkml]   [2007]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: QUEUE_FLAG_CLUSTER: not working in 2.6.24 ?
From
Date

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




\
 
 \ /
  Last update: 2007-12-13 23:17    [W:0.761 / U:0.940 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site