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| author | Pekka Enberg <penberg@kernel.org> | 2010-10-02 11:32:32 +0300 |
|---|---|---|
| committer | Pekka Enberg <penberg@kernel.org> | 2010-10-06 16:52:26 +0300 |
| commit | 15b7c5142049e7efc3071280e1370dc3b8add6f5 (patch) | |
| tree | c294e0aa90b52088e63c8c67d0963a973d304690 /mm | |
| parent | 5d1f57e4d3d547b113ebd62f569be13bf485e53b (diff) | |
| download | linux-3.10-15b7c5142049e7efc3071280e1370dc3b8add6f5.tar.gz linux-3.10-15b7c5142049e7efc3071280e1370dc3b8add6f5.tar.bz2 linux-3.10-15b7c5142049e7efc3071280e1370dc3b8add6f5.zip | |
SLUB: Optimize slab_free() debug check
This patch optimizes slab_free() debug check to use "c->node != NUMA_NO_NODE"
instead of "c->node >= 0" because the former generates smaller code on x86-64:
Before:
4736: 48 39 70 08 cmp %rsi,0x8(%rax)
473a: 75 26 jne 4762 <kfree+0xa2>
473c: 44 8b 48 10 mov 0x10(%rax),%r9d
4740: 45 85 c9 test %r9d,%r9d
4743: 78 1d js 4762 <kfree+0xa2>
After:
4736: 48 39 70 08 cmp %rsi,0x8(%rax)
473a: 75 23 jne 475f <kfree+0x9f>
473c: 83 78 10 ff cmpl $0xffffffffffffffff,0x10(%rax)
4740: 74 1d je 475f <kfree+0x9f>
This patch also cleans up __slab_alloc() to use NUMA_NO_NODE instead of "-1"
for enabling debugging for a per-CPU cache.
Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slub.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/slub.c b/mm/slub.c index 9f121c10184..a018019aa91 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1718,7 +1718,7 @@ debug: c->page->inuse++; c->page->freelist = get_freepointer(s, object); - c->node = -1; + c->node = NUMA_NO_NODE; goto unlock_out; } @@ -1895,7 +1895,7 @@ static __always_inline void slab_free(struct kmem_cache *s, slab_free_hook_irq(s, x); - if (likely(page == c->page && c->node >= 0)) { + if (likely(page == c->page && c->node != NUMA_NO_NODE)) { set_freepointer(s, object, c->freelist); c->freelist = object; stat(s, FREE_FASTPATH); |