tree 4443514e99740054028f6eb035c796a74a540ab1
parent 319d1e240683d37924ea8977c91730c3393fd453
author Christoph Lameter <clameter@sgi.com> 1208189501 +0300
committer Pekka Enberg <penberg@cs.helsinki.fi> 1209310098 +0300

slub: Make the order configurable for each slab cache

Makes /sys/kernel/slab/<slabname>/order writable. The allocation
order of a slab cache can then be changed dynamically during runtime.
This can be used to override the objects per slabs value establisheed
with the slub_min_objects setting that was manually specified or
calculated on bootup.

The changes of the slab order can occur while allocate_slab() runs.
Allocate slab needs the order and the number of slab objects that
are both changed by the change of order. Both are put into
a single word (struct kmem_cache_order_objects). They can then
be atomically updated and retrieved.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>