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slab: use __GFP_COMP flag for allocating slab pages 

If we use 'struct page' of first page as 'struct slab', there is no
advantage not to use __GFP_COMP. So use __GFP_COMP flag for all the cases.

Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Pekka Enberg <penberg@iki.fi>
wifi-calibration
Joonsoo Kim 2013-10-24 10:07:44 +09:00 committed by Pekka Enberg
parent 56f295ef0d
commit a57a49887e
1 changed files with 9 additions and 34 deletions
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43
mm/slab.c
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@ -1718,15 +1718,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
{
struct page *page;
int nr_pages;
int i;
#ifndef CONFIG_MMU
/*
* Nommu uses slab's for process anonymous memory allocations, and thus
* requires __GFP_COMP to properly refcount higher order allocations
*/
flags |= __GFP_COMP;
#endif
flags |= cachep->allocflags;
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
@ -1750,12 +1741,9 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
else
add_zone_page_state(page_zone(page),
NR_SLAB_UNRECLAIMABLE, nr_pages);
for (i = 0; i < nr_pages; i++) {
__SetPageSlab(page + i);
if (page->pfmemalloc)
SetPageSlabPfmemalloc(page);
}
__SetPageSlab(page);
if (page->pfmemalloc)
SetPageSlabPfmemalloc(page);
memcg_bind_pages(cachep, cachep->gfporder);
if (kmemcheck_enabled && !(cachep->flags & SLAB_NOTRACK)) {
@ -1775,8 +1763,7 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
*/
static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
{
unsigned long i = (1 << cachep->gfporder);
const unsigned long nr_freed = i;
const unsigned long nr_freed = (1 << cachep->gfporder);
kmemcheck_free_shadow(page, cachep->gfporder);
@ -1787,12 +1774,9 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
sub_zone_page_state(page_zone(page),
NR_SLAB_UNRECLAIMABLE, nr_freed);
BUG_ON(!PageSlab(page));
__ClearPageSlabPfmemalloc(page);
while (i--) {
BUG_ON(!PageSlab(page));
__ClearPageSlab(page);
page++;
}
__ClearPageSlab(page);
memcg_release_pages(cachep, cachep->gfporder);
if (current->reclaim_state)
@ -2362,7 +2346,7 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
cachep->colour = left_over / cachep->colour_off;
cachep->slab_size = slab_size;
cachep->flags = flags;
cachep->allocflags = 0;
cachep->allocflags = __GFP_COMP;
if (CONFIG_ZONE_DMA_FLAG && (flags & SLAB_CACHE_DMA))
cachep->allocflags |= GFP_DMA;
cachep->size = size;
@ -2729,17 +2713,8 @@ static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp,
static void slab_map_pages(struct kmem_cache *cache, struct slab *slab,
struct page *page)
{
int nr_pages;
nr_pages = 1;
if (likely(!PageCompound(page)))
nr_pages <<= cache->gfporder;
do {
page->slab_cache = cache;
page->slab_page = slab;
page++;
} while (--nr_pages);
page->slab_cache = cache;
page->slab_page = slab;
}
/*