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SLUB: Get rid of dynamic DMA kmalloc cache allocation

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Dynamic DMA kmalloc cache allocation is troublesome since the
new percpu allocator does not support allocations in atomic contexts.
Reserve some statically allocated kmalloc_cpu structures instead.

Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Christoph Lameter 2009-12-18 16:26:21 -06:00 • committed by Pekka Enberg
parent 9dfc6e68bf
commit 756dee7587
2 changed files with 21 additions and 22 deletions
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19
include/linux/slub_def.h
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@ -131,11 +131,21 @@ struct kmem_cache {
#define SLUB_PAGE_SHIFT (PAGE_SHIFT + 2)
#ifdef CONFIG_ZONE_DMA
#define SLUB_DMA __GFP_DMA
/* Reserve extra caches for potential DMA use */
#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT - 6)
#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[SLUB_PAGE_SHIFT];
extern struct kmem_cache kmalloc_caches[KMALLOC_CACHES];
/*
* Sorry that the following has to be that ugly but some versions of GCC
@ -203,13 +213,6 @@ static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
return &kmalloc_caches[index];
}
#ifdef CONFIG_ZONE_DMA
#define SLUB_DMA __GFP_DMA
#else
/* Disable DMA functionality */
#define SLUB_DMA (__force gfp_t)0
#endif
void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
void *__kmalloc(size_t size, gfp_t flags);