Re: QUEUE_FLAG_CLUSTER: not working in 2.6.24 ?

[Mark Lord]

Mark Lord wrote:
> Andrew Morton wrote:
> > On Thu, 13 Dec 2007 17:15:06 -0500
> > James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxx> 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...
> ..
>
> I'm actually running the treadmill right now (have been for many hours, 
> actually,
> to bisect it to a specific commit.
>
> Thought I was almost done, and then noticed that git-bisect doesn't keep
> the Makefile VERSION lines the same, so I was actually running the wrong
> kernel after the first few times.. duh.
>
> Wrote a script to fix it now.
..

Well, that was a waste of three hours.

Somebody else can try it now.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/