linux-kernel - [PATCH -mm] slub: document setting min order with debug_guardpage

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Date:	Mon, 12 Dec 2011 15:59:49 +0100
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-mm@...ck.org, 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>
Subject: [PATCH -mm] slub: document setting min order with
 debug_guardpage_minorder > 0

Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
---
English is hard (definitely harder than C language :-), so please correct
me, if I wrote something wrong.

 Documentation/ABI/testing/sysfs-kernel-slab |    4 +++-
 Documentation/vm/slub.txt                   |    4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-kernel-slab b/Documentation/ABI/testing/sysfs-kernel-slab
index 8b093f8..d84ca80 100644
--- a/Documentation/ABI/testing/sysfs-kernel-slab
+++ b/Documentation/ABI/testing/sysfs-kernel-slab
@@ -345,7 +345,9 @@ Description:
 		allocated.  It is writable and can be changed to increase the
 		number of objects per slab.  If a slab cannot be allocated
 		because of fragmentation, SLUB will retry with the minimum order
-		possible depending on its characteristics.
+		possible depending on its characteristics. 
+		When debug_guardpage_minorder > 0 parameter is specified, the
+		minimum possible order is used and cannot be changed.
 
 What:		/sys/kernel/slab/cache/order_fallback
 Date:		April 2008
diff --git a/Documentation/vm/slub.txt b/Documentation/vm/slub.txt
index f464f47..dbf02ad 100644
--- a/Documentation/vm/slub.txt
+++ b/Documentation/vm/slub.txt
@@ -131,7 +131,9 @@ slub_min_objects.
 slub_max_order specified the order at which slub_min_objects should no
 longer be checked. This is useful to avoid SLUB trying to generate
 super large order pages to fit slub_min_objects of a slab cache with
-large object sizes into one high order page.
+large object sizes into one high order page. Setting parameter
+debug_guardpage_minorder > 0 forces setting slub_max_order to 0, what
+cause minimum possible order of slabs allocation.
 
 SLUB Debug output
 -----------------
-- 
1.7.1

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