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slab: infrastructure for bulk object allocation and freeing

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Add the basic infrastructure for alloc/free operations on pointer arrays.
It includes a generic function in the common slab code that is used in
this infrastructure patch to create the unoptimized functionality for slab
bulk operations.

Allocators can then provide optimized allocation functions for situations
in which large numbers of objects are needed.  These optimization may
avoid taking locks repeatedly and bypass metadata creation if all objects
in slab pages can be used to provide the objects required.

Allocators can extend the skeletons provided and add their own code to the
bulk alloc and free functions.  They can keep the generic allocation and
freeing and just fall back to those if optimizations would not work (like
for example when debugging is on).

Signed-off-by: Christoph Lameter <[email protected]>
Signed-off-by: Jesper Dangaard Brouer <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2015-09-04 15:45:34 -07:00 • committed by Linus Torvalds
commit 484748f0b6
6 changed files with 82 additions and 0 deletions
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13
mm/slob.c
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@ -611,6 +611,19 @@ void kmem_cache_free(struct kmem_cache *c, void *b)
}
EXPORT_SYMBOL(kmem_cache_free);
void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)
{
__kmem_cache_free_bulk(s, size, p);
}
EXPORT_SYMBOL(kmem_cache_free_bulk);
bool kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
void **p)
{
return __kmem_cache_alloc_bulk(s, flags, size, p);
}
EXPORT_SYMBOL(kmem_cache_alloc_bulk);
int __kmem_cache_shutdown(struct kmem_cache *c)
{
/* No way to check for remaining objects */