linux-kernel - [PATCH v3 3/3] slub: min order when debug_guardpage

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Date:	Fri, 18 Nov 2011 17:25:07 +0100
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Stanislaw Gruszka <sgruszka@...hat.com>
Subject: [PATCH v3 3/3] slub: min order when debug_guardpage_minorder > 0

Disable slub debug facilities and allocate slabs at minimal order when
debug_guardpage_minorder > 0 to increase probability to catch random
memory corruption by cpu exception.

v1 -> v2:
  - use slub_max_order to minimalize slub order

Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
---
 mm/slub.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 7d2a996..a66be56 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3645,6 +3645,9 @@ void __init kmem_cache_init(void)
 	struct kmem_cache *temp_kmem_cache_node;
 	unsigned long kmalloc_size;
 
+	if (debug_guardpage_minorder())
+		slub_max_order = 0;
+
 	kmem_size = offsetof(struct kmem_cache, node) +
 				nr_node_ids * sizeof(struct kmem_cache_node *);
 
-- 
1.7.1

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