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Message-ID: <20090604125228.GZ1065@one.firstfloor.org> Date: Thu, 4 Jun 2009 14:52:28 +0200 From: Andi Kleen <andi@...stfloor.org> To: Wu Fengguang <fengguang.wu@...el.com> Cc: Andi Kleen <andi@...stfloor.org>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "npiggin@...e.de" <npiggin@...e.de>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org> Subject: Re: [PATCH] [6/16] HWPOISON: Add various poison checks in mm/memory.c On Thu, Jun 04, 2009 at 07:55:33PM +0800, Wu Fengguang wrote: > On Thu, Jun 04, 2009 at 01:19:15PM +0800, Andi Kleen wrote: > > On Thu, Jun 04, 2009 at 12:26:03PM +0800, Wu Fengguang wrote: > > > On Thu, Jun 04, 2009 at 02:46:38AM +0800, Andi Kleen wrote: > > > > > > > > Bail out early when hardware poisoned pages are found in page fault handling. > > > > > > I suspect this patch is also not absolutely necessary: the poisoned > > > page will normally have been isolated already. > > > > It's needed to prevent new pages comming in when there is a parallel > > fault while the memory failure handling is in process. > > Otherwise the pages could get remapped in that small window. > > This patch makes no difference at least for file pages, including tmpfs. I was more thinking of anonymous pages with multiple mappers (e.g. COW after fork) -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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