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 ESMTP id 52ECD5F0001 for ; Tue, 7 Apr 2009 11:10:17 -0400 (EDT) From: Andi Kleen References: <20090407509.382219156@firstfloor.org> In-Reply-To: <20090407509.382219156@firstfloor.org> Subject: [PATCH] [11/16] POISON: Handle poisoned pages in try_to_unmap Message-Id: <20090407151008.AA5A21D0470@basil.firstfloor.org> Date: Tue, 7 Apr 2009 17:10:08 +0200 (CEST) Sender: owner-linux-mm@kvack.org To: Lee.Schermerhorn@hp.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org List-ID: 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. Cc: Lee.Schermerhorn@hp.com Signed-off-by: Andi Kleen --- mm/rmap.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) Index: linux/mm/rmap.c =================================================================== --- linux.orig/mm/rmap.c 2009-04-07 16:39:39.000000000 +0200 +++ linux/mm/rmap.c 2009-04-07 16:39:39.000000000 +0200 @@ -801,7 +801,14 @@ /* Update high watermark before we lower rss */ update_hiwater_rss(mm); - if (PageAnon(page)) { + if (PagePoison(page)) { + 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_poison_entry(page))); + } else if (PageAnon(page)) { swp_entry_t entry = { .val = page_private(page) }; if (PageSwapCache(page)) { -- 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