From 5087c8229986cc502c807a15f8ea416b0ef22346 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Tue, 10 Sep 2013 17:02:51 -0700 Subject: [PATCH] slab: Make allocations with GFP_ZERO slightly more efficient Use the likely mechanism already around valid pointer tests to better choose when to memset to 0 allocations with __GFP_ZERO Acked-by: Christoph Lameter Signed-off-by: Joe Perches Signed-off-by: Pekka Enberg --- mm/slab.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index 54eba8a65370..8347d803a23f 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3278,11 +3278,11 @@ slab_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid, kmemleak_alloc_recursive(ptr, cachep->object_size, 1, cachep->flags, flags); - if (likely(ptr)) + if (likely(ptr)) { kmemcheck_slab_alloc(cachep, flags, ptr, cachep->object_size); - - if (unlikely((flags & __GFP_ZERO) && ptr)) - memset(ptr, 0, cachep->object_size); + if (unlikely(flags & __GFP_ZERO)) + memset(ptr, 0, cachep->object_size); + } return ptr; } @@ -3343,11 +3343,11 @@ slab_alloc(struct kmem_cache *cachep, gfp_t flags, unsigned long caller) flags); prefetchw(objp); - if (likely(objp)) + if (likely(objp)) { kmemcheck_slab_alloc(cachep, flags, objp, cachep->object_size); - - if (unlikely((flags & __GFP_ZERO) && objp)) - memset(objp, 0, cachep->object_size); + if (unlikely(flags & __GFP_ZERO)) + memset(objp, 0, cachep->object_size); + } return objp; }