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slub: Dynamically size kmalloc cache allocations

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kmalloc caches are statically defined and may take up a lot of space just
because the sizes of the node array has to be dimensioned for the largest
node count supported.

This patch makes the size of the kmem_cache structure dynamic throughout by
creating a kmem_cache slab cache for the kmem_cache objects. The bootstrap
occurs by allocating the initial one or two kmem_cache objects from the
page allocator.

C2->C3
	- Fix various issues indicated by David
	- Make create kmalloc_cache return a kmem_cache * pointer.

Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter
2010-08-20 12:37:15 -05:00
committed by Pekka Enberg
parent 6c182dc0de
commit 51df114281
2 changed files with 140 additions and 58 deletions
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7
include/linux/slub_def.h
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@@ -139,19 +139,16 @@ struct kmem_cache {
#ifdef CONFIG_ZONE_DMA
#define SLUB_DMA __GFP_DMA
/* Reserve extra caches for potential DMA use */
#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT)
#else
/* Disable DMA functionality */
#define SLUB_DMA (__force gfp_t)0
#define KMALLOC_CACHES SLUB_PAGE_SHIFT
#endif
/*
* We keep the general caches in an array of slab caches that are used for
* 2^x bytes of allocations.
*/
extern struct kmem_cache kmalloc_caches[KMALLOC_CACHES];
extern struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT];
/*
* Sorry that the following has to be that ugly but some versions of GCC
@@ -216,7 +213,7 @@ static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
if (index == 0)
return NULL;
return &kmalloc_caches[index];
return kmalloc_caches[index];
}
void *kmem_cache_alloc(struct kmem_cache *, gfp_t);