diff options
| author | Christoph Lameter <cl@linux.com> | 2012-05-09 10:09:58 -0500 |
|---|---|---|
| committer | Pekka Enberg <penberg@kernel.org> | 2012-06-01 09:25:41 +0300 |
| commit | f6e7def7f7d749759e4bf36dcc25ae289a20d868 (patch) | |
| tree | 6933c30c5b94e429f1c452c83dc91f4359c0c879 /mm/slub.c | |
| parent | c17dda40a6a4ed95f035db38b7ba4fab0d99da44 (diff) | |
| download | lwn-f6e7def7f7d749759e4bf36dcc25ae289a20d868.tar.gz lwn-f6e7def7f7d749759e4bf36dcc25ae289a20d868.zip | |
slub: Use page variable instead of c->page.
Store the value of c->page to avoid additional fetches
from per cpu data.
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/mm/slub.c b/mm/slub.c index 2389a016577e..6b60fc907a71 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2208,6 +2208,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, unsigned long addr, struct kmem_cache_cpu *c) { void *freelist; + struct page *page; unsigned long flags; local_irq_save(flags); @@ -2220,13 +2221,14 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, c = this_cpu_ptr(s->cpu_slab); #endif - if (!c->page) + page = c->page; + if (!page) goto new_slab; redo: if (unlikely(!node_match(c, node))) { stat(s, ALLOC_NODE_MISMATCH); - deactivate_slab(s, c->page, c->freelist); + deactivate_slab(s, page, c->freelist); c->page = NULL; c->freelist = NULL; goto new_slab; @@ -2239,7 +2241,7 @@ redo: stat(s, ALLOC_SLOWPATH); - freelist = get_freelist(s, c->page); + freelist = get_freelist(s, page); if (!freelist) { c->page = NULL; @@ -2264,8 +2266,8 @@ load_freelist: new_slab: if (c->partial) { - c->page = c->partial; - c->partial = c->page->next; + page = c->page = c->partial; + c->partial = page->next; stat(s, CPU_PARTIAL_ALLOC); c->freelist = NULL; goto redo; @@ -2281,14 +2283,15 @@ new_slab: return NULL; } + page = c->page; if (likely(!kmem_cache_debug(s))) goto load_freelist; /* Only entered in the debug case */ - if (!alloc_debug_processing(s, c->page, freelist, addr)) + if (!alloc_debug_processing(s, page, freelist, addr)) goto new_slab; /* Slab failed checks. Next slab needed */ - deactivate_slab(s, c->page, get_freepointer(s, freelist)); + deactivate_slab(s, page, get_freepointer(s, freelist)); c->page = NULL; c->freelist = NULL; local_irq_restore(flags); |