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authorLinus Torvalds <torvalds@linux-foundation.org>2009-09-14 17:38:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-14 17:38:52 -0700
commitbb193c986a7104f718c1b92709e1e6e22ac3f864 (patch)
tree1d5a1b08e31a8e39ec4688afd24695c0c6a113ae /Documentation
parentf65ac45e20b03081ed64f41ce91bb982f8ac258d (diff)
parentaceda773606f2506a25b91aaafae87b2e4315834 (diff)
downloadlinux-bb193c986a7104f718c1b92709e1e6e22ac3f864.tar.bz2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6: slub: fix slab_pad_check() slub: release kobject if sysfs_create_group failed in sysfs_slab_add SLUB: fix ARCH_KMALLOC_MINALIGN cases 64 and 256 SLUB: Fix some coding style issues SLUB: Drop write permission to /proc/slabinfo slab: remove duplicate kmem_cache_init_late() declarations slub: change kmem_cache->align to record the real alignment slub: use size and objsize orders to disable debug flags slub: add option to disable higher order debugging slabs
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/vm/slub.txt10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/vm/slub.txt b/Documentation/vm/slub.txt
index bb1f5c6e28b3..510917ff59ed 100644
--- a/Documentation/vm/slub.txt
+++ b/Documentation/vm/slub.txt
@@ -41,6 +41,8 @@ Possible debug options are
P Poisoning (object and padding)
U User tracking (free and alloc)
T Trace (please only use on single slabs)
+ O Switch debugging off for caches that would have
+ caused higher minimum slab orders
- Switch all debugging off (useful if the kernel is
configured with CONFIG_SLUB_DEBUG_ON)
@@ -59,6 +61,14 @@ to the dentry cache with
slub_debug=F,dentry
+Debugging options may require the minimum possible slab order to increase as
+a result of storing the metadata (for example, caches with PAGE_SIZE object
+sizes). This has a higher liklihood of resulting in slab allocation errors
+in low memory situations or if there's high fragmentation of memory. To
+switch off debugging for such caches by default, use
+
+ slub_debug=O
+
In case you forgot to enable debugging on the kernel command line: It is
possible to enable debugging manually when the kernel is up. Look at the
contents of: