slub: Make the order configurable for each slab cache

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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>

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Christoph Lameter 2008-04-14 19:11:41 +03:00 • committed by Pekka Enberg

parent 319d1e2406

commit 06b285dc3d

1 changed files with 22 additions and 7 deletions

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mm/slub.c

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