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slub: Determine gfpflags once and not every time a slab is allocated

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Currently we determine the gfp flags to pass to the page allocator
each time a slab is being allocated.

Determine the bits to be set at the time the slab is created. Store
in a new allocflags field and add the flags in allocate_slab().

Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
This commit is contained in:
Christoph Lameter 2008-02-14 14:21:32 -08:00 committed by Christoph Lameter
parent dada123d99
commit b7a49f0d4c
2 changed files with 12 additions and 8 deletions
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1
include/linux/slub_def.h
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@ -71,6 +71,7 @@ struct kmem_cache {
/* Allocation and freeing of slabs */ /* Allocation and freeing of slabs */
int objects; /* Number of objects in slab */ int objects; /* Number of objects in slab */
gfp_t allocflags; /* gfp flags to use on each alloc */
int refcount; /* Refcount for slab cache destroy */ int refcount; /* Refcount for slab cache destroy */
void (*ctor)(struct kmem_cache *, void *); void (*ctor)(struct kmem_cache *, void *);
int inuse; /* Offset to metadata */ int inuse; /* Offset to metadata */

19
mm/slub.c
View File

@ -1078,14 +1078,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
struct page *page; struct page *page;
int pages = 1 << s->order; int pages = 1 << s->order;
if (s->order) flags |= s->allocflags;
flags |= __GFP_COMP;
if (s->flags & SLAB_CACHE_DMA)
flags |= SLUB_DMA;
if (s->flags & SLAB_RECLAIM_ACCOUNT)
flags |= __GFP_RECLAIMABLE;
if (node == -1) if (node == -1)
page = alloc_pages(flags, s->order); page = alloc_pages(flags, s->order);
@ -2333,6 +2326,16 @@ static int calculate_sizes(struct kmem_cache *s)
if (s->order < 0) if (s->order < 0)
return 0; return 0;
s->allocflags = 0;
if (s->order)
s->allocflags |= __GFP_COMP;
if (s->flags & SLAB_CACHE_DMA)
s->allocflags |= SLUB_DMA;
if (s->flags & SLAB_RECLAIM_ACCOUNT)
s->allocflags |= __GFP_RECLAIMABLE;
/* /*
* Determine the number of objects per slab * Determine the number of objects per slab
*/ */