mm/slab.c: only set __GFP_RECLAIMABLE once

SLAB_RECLAIM_ACCOUNT is a permanent attribute of a slab cache.  Set
__GFP_RECLAIMABLE as part of its ->allocflags rather than check the
cachep flag on every page allocation.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: David Rientjes <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: rientjes

mm/slab.c

@@ -1410,8 +1410,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
 	int nr_pages;
 
 	flags |= cachep->allocflags;
-	if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
-		flags |= __GFP_RECLAIMABLE;
 
 	page = __alloc_pages_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder);
 	if (!page) {
@@ -2144,6 +2142,8 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
 	cachep->allocflags = __GFP_COMP;
 	if (flags & SLAB_CACHE_DMA)
 		cachep->allocflags |= GFP_DMA;
+	if (flags & SLAB_RECLAIM_ACCOUNT)
+		cachep->allocflags |= __GFP_RECLAIMABLE;
 	cachep->size = size;
 	cachep->reciprocal_buffer_size = reciprocal_value(size);