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Subject: [RFC PATCH V2 9/9] slab: annotate code to generate more compact asm
 code
From: Jesper Dangaard Brouer <brouer@redhat.com>
Date: Tue, 08 Dec 2015 17:19:08 +0100
Message-ID: <20151208161908.21945.177.stgit@firesoul>
In-Reply-To: <20151208161751.21945.53936.stgit@firesoul>
References: <20151208161751.21945.53936.stgit@firesoul>
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Sender: owner-linux-mm@kvack.org
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To: linux-mm@kvack.org
Cc: Christoph Lameter <cl@linux.com>, Vladimir Davydov <vdavydov@virtuozzo.com>, Jesper Dangaard Brouer <brouer@redhat.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>

Premature optimizations for CONFIG_NUMA case...
---
 mm/slab.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 72c7958b4075..6d79fc5668c4 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3185,7 +3185,7 @@ __do_cache_alloc(struct kmem_cache *cache, gfp_t flags)
 {
 	void *objp;
 
-	if (current->mempolicy || cpuset_do_slab_mem_spread()) {
+	if (unlikely(current->mempolicy || cpuset_do_slab_mem_spread())) {
 		objp = alternate_node_alloc(cache, flags);
 		if (objp)
 			goto out;
@@ -3196,7 +3196,7 @@ __do_cache_alloc(struct kmem_cache *cache, gfp_t flags)
 	 * We may just have run out of memory on the local node.
 	 * ____cache_alloc_node() knows how to locate memory on other nodes
 	 */
-	if (!objp)
+	if (unlikely(!objp))
 		objp = ____cache_alloc_node(cache, flags, numa_mem_id());
 
   out:

--
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