On Thu, 13 Dec 2007 17:15:06 -0500
James Bottomley <[email protected]> wrote:
>
> On Thu, 2007-12-13 at 14:02 -0800, Andrew Morton wrote:
> > On Thu, 13 Dec 2007 21:09:59 +0100
> > Jens Axboe <[email protected]> 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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