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| author | Stanislaw Gruszka <sgruszka@redhat.com> | 2012-01-12 17:17:39 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-12 20:13:04 -0800 |
| commit | 888a214dc4c65e1486ef7d3ac6b0cf93ae3cc2c7 (patch) | |
| tree | d371fad11fae907025eb9766d9b2c66978b0e41f /Documentation | |
| parent | 15ee2d000dd5813fcf1204b078fa276e57046b64 (diff) | |
| download | lwn-888a214dc4c65e1486ef7d3ac6b0cf93ae3cc2c7.tar.gz lwn-888a214dc4c65e1486ef7d3ac6b0cf93ae3cc2c7.zip | |
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-slab | 4 | ||||
| -rw-r--r-- | Documentation/vm/slub.txt | 5 |
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 ----------------- |