slab_should_failslab() is called on every allocation, so to optimize it
is reasonable. We normally don't allocate from kmem_cache. It is just
used when new kmem_cache is created, so it's very rare case. Therefore,
add unlikely macro to help compiler optimization.
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
diff --git a/mm/slab.c b/mm/slab.c
index 25317fd..1fede40 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2993,7 +2993,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
static bool slab_should_failslab(struct kmem_cache *cachep, gfp_t flags)
{
- if (cachep == kmem_cache)
+ if (unlikely(cachep == kmem_cache))
return false;
return should_failslab(cachep->object_size, flags, cachep->flags);
--
1.7.9.5
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