Commit d3aec344 authored by Joonsoo Kim's avatar Joonsoo Kim Committed by Linus Torvalds
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mm/slab: noinline __ac_put_obj()

Our intention of __ac_put_obj() is that it doesn't affect anything if
sk_memalloc_socks() is disabled.  But, because __ac_put_obj() is too
small, compiler inline it to ac_put_obj() and affect code size of free
path.  This patch add noinline keyword for __ac_put_obj() not to distrupt
normal free path at all.

nm -S slab-orig.o |
	grep -e "t cache_alloc_refill" -e "T kfree" -e "T kmem_cache_free"

0000000000001e80 00000000000002f5 t cache_alloc_refill
0000000000001230 0000000000000258 T kfree
0000000000000690 000000000000024c T kmem_cache_free

nm -S slab-patched.o |
	grep -e "t cache_alloc_refill" -e "T kfree" -e "T kmem_cache_free"

0000000000001e00 00000000000002e5 t cache_alloc_refill
00000000000011e0 0000000000000228 T kfree
0000000000000670 0000000000000216 T kmem_cache_free

cache_alloc_refill: 0x2f5->0x2e5
kfree: 0x256->0x228
kmem_cache_free: 0x24c->0x216

code size of each function is reduced slightly.

Signed-off-by: default avatarJoonsoo Kim <>
Cc: Christoph Lameter <>
Cc: Pekka Enberg <>
Cc: David Rientjes <>
Cc: Zhang Yanfei <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 3d880194
......@@ -785,8 +785,8 @@ static inline void *ac_get_obj(struct kmem_cache *cachep,
return objp;
static void *__ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac,
void *objp)
static noinline void *__ac_put_obj(struct kmem_cache *cachep,
struct array_cache *ac, void *objp)
if (unlikely(pfmemalloc_active)) {
/* Some pfmemalloc slabs exist, check if this is one */
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