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... - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
