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authorStanislaw Gruszka <sgruszka@redhat.com>2012-01-12 17:17:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-12 20:13:04 -0800
commit888a214dc4c65e1486ef7d3ac6b0cf93ae3cc2c7 (patch)
treed371fad11fae907025eb9766d9b2c66978b0e41f /Documentation
parent15ee2d000dd5813fcf1204b078fa276e57046b64 (diff)
downloadlinux-linaro-stable-888a214dc4c65e1486ef7d3ac6b0cf93ae3cc2c7.tar.gz
slub: document setting min order with debug_guardpage_minorder > 0
Acked-by: David Rientjes <rientjes@google.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-kernel-slab4
-rw-r--r--Documentation/vm/slub.txt5
2 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-slab b/Documentation/ABI/testing/sysfs-kernel-slab
index 8b093f8222d3..91bd6ca5440f 100644
--- a/Documentation/ABI/testing/sysfs-kernel-slab
+++ b/Documentation/ABI/testing/sysfs-kernel-slab
@@ -346,6 +346,10 @@ Description:
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.
+ When debug_guardpage_minorder=N (N > 0) parameter is specified
+ (see Documentation/kernel-parameters.txt), the minimum possible
+ order is used and this sysfs entry can not be used to change
+ the order at run time.
What: /sys/kernel/slab/cache/order_fallback
Date: April 2008
diff --git a/Documentation/vm/slub.txt b/Documentation/vm/slub.txt
index 2acdda9601b0..6752870c4970 100644
--- a/Documentation/vm/slub.txt
+++ b/Documentation/vm/slub.txt
@@ -131,7 +131,10 @@ 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 command line
+parameter debug_guardpage_minorder=N (N > 0), forces setting
+slub_max_order to 0, what cause minimum possible order of slabs
+allocation.
SLUB Debug output
-----------------