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slub: document setting min order with debug_guardpage_minorder > 0

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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>
This commit is contained in:
Stanislaw Gruszka 2012-01-12 17:17:39 -08:00 committed by Linus Torvalds
parent 15ee2d000d
commit 888a214dc4
2 changed files with 8 additions and 1 deletions
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4
Documentation/ABI/testing/sysfs-kernel-slab
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@ -346,6 +346,10 @@ Description:
number of objects per slab. If a slab cannot be allocated number of objects per slab. If a slab cannot be allocated
because of fragmentation, SLUB will retry with the minimum order because of fragmentation, SLUB will retry with the minimum order
possible depending on its characteristics. 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 What: /sys/kernel/slab/cache/order_fallback
Date: April 2008 Date: April 2008

5
Documentation/vm/slub.txt
View file

@ -131,7 +131,10 @@ slub_min_objects.
slub_max_order specified the order at which slub_min_objects should no 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 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 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 SLUB Debug output
----------------- -----------------