From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 0A1C06B004F for ; Thu, 4 Jun 2009 00:35:55 -0400 (EDT) Date: Thu, 4 Jun 2009 12:35:41 +0800 From: Wu Fengguang Subject: Re: [PATCH] [9/16] HWPOISON: Handle hardware poisoned pages in try_to_unmap Message-ID: <20090604043541.GC15682@localhost> References: <20090603846.816684333@firstfloor.org> <20090603184642.BD4B91D0291@basil.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090603184642.BD4B91D0291@basil.firstfloor.org> Sender: owner-linux-mm@kvack.org To: Andi Kleen Cc: "akpm@linux-foundation.org" , "npiggin@suse.de" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" List-ID: On Thu, Jun 04, 2009 at 02:46:42AM +0800, Andi Kleen wrote: > > When a page has the poison bit set replace the PTE with a poison entry. > This causes the right error handling to be done later when a process runs > into it. > > Also add a new flag to not do that (needed for the memory-failure handler > later) > > Signed-off-by: Andi Kleen > > --- > include/linux/rmap.h | 1 + > mm/rmap.c | 9 ++++++++- > 2 files changed, 9 insertions(+), 1 deletion(-) > > Index: linux/mm/rmap.c > =================================================================== > --- linux.orig/mm/rmap.c 2009-06-03 19:36:23.000000000 +0200 > +++ linux/mm/rmap.c 2009-06-03 20:39:49.000000000 +0200 > @@ -943,7 +943,14 @@ > /* Update high watermark before we lower rss */ > update_hiwater_rss(mm); > > - if (PageAnon(page)) { > + if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) { > + if (PageAnon(page)) > + dec_mm_counter(mm, anon_rss); > + else if (!is_migration_entry(pte_to_swp_entry(*pte))) > + dec_mm_counter(mm, file_rss); > + set_pte_at(mm, address, pte, > + swp_entry_to_pte(make_hwpoison_entry(page))); > + } else if (PageAnon(page)) { > swp_entry_t entry = { .val = page_private(page) }; > > if (PageSwapCache(page)) { > Index: linux/include/linux/rmap.h > =================================================================== > --- linux.orig/include/linux/rmap.h 2009-06-03 19:36:23.000000000 +0200 > +++ linux/include/linux/rmap.h 2009-06-03 19:36:23.000000000 +0200 > @@ -93,6 +93,7 @@ > > TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */ > TTU_IGNORE_ACCESS = (1 << 9), /* don't age */ > + TTU_IGNORE_HWPOISON = (1 << 10),/* corrupted page is recoverable */ Or more precisely comment it as "corrupted data is recoverable"? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org