linux-kernel - [PATCH] [11/16] POISON: Handle poisoned pages in try_to

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Message-Id: <20090407151008.AA5A21D0470@basil.firstfloor.org>
Date:	Tue,  7 Apr 2009 17:10:08 +0200 (CEST)
From:	Andi Kleen <andi@...stfloor.org>
To:	Lee.Schermerhorn@...com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, x86@...nel.org
Subject: [PATCH] [11/16] POISON: Handle poisoned pages in try_to_unmap


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@...com
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 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)) {
--
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