diff options
| author | Satyam Sharma <satyam@infradead.org> | 2007-10-16 01:24:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:42:53 -0700 |
| commit | 2408c55037c3f7d51a8a100025c47595e71b838c (patch) | |
| tree | 71940f72dbadf6a6744ffbd062ef4fd8754aa623 /mm/slub.c | |
| parent | c92ff1bde06f69d59b40f3194016aee51cc5da55 (diff) | |
| download | lwn-2408c55037c3f7d51a8a100025c47595e71b838c.tar.gz lwn-2408c55037c3f7d51a8a100025c47595e71b838c.zip | |
{slub, slob}: use unlikely() for kfree(ZERO_OR_NULL_PTR) check
Considering kfree(NULL) would normally occur only in error paths and
kfree(ZERO_SIZE_PTR) is uncommon as well, so let's use unlikely() for the
condition check in SLUB's and SLOB's kfree() to optimize for the common
case. SLAB has this already.
Signed-off-by: Satyam Sharma <satyam@infradead.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/mm/slub.c b/mm/slub.c index edeb942dc8ae..b7d3664fa3a9 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2449,7 +2449,7 @@ size_t ksize(const void *object) struct page *page; struct kmem_cache *s; - if (ZERO_OR_NULL_PTR(object)) + if (unlikely(ZERO_OR_NULL_PTR(object))) return 0; page = get_object_page(object); @@ -2483,7 +2483,7 @@ void kfree(const void *x) { struct page *page; - if (ZERO_OR_NULL_PTR(x)) + if (unlikely(ZERO_OR_NULL_PTR(x))) return; page = virt_to_head_page(x); @@ -2800,7 +2800,7 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, void *caller) get_order(size)); s = get_slab(size, gfpflags); - if (ZERO_OR_NULL_PTR(s)) + if (unlikely(ZERO_OR_NULL_PTR(s))) return s; return slab_alloc(s, gfpflags, -1, caller); @@ -2816,7 +2816,7 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, get_order(size)); s = get_slab(size, gfpflags); - if (ZERO_OR_NULL_PTR(s)) + if (unlikely(ZERO_OR_NULL_PTR(s))) return s; return slab_alloc(s, gfpflags, node, caller); |