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authorChristoph Lameter <cl@linux.com>2012-05-09 10:09:58 -0500
committerPekka Enberg <penberg@kernel.org>2012-06-01 09:25:41 +0300
commitf6e7def7f7d749759e4bf36dcc25ae289a20d868 (patch)
tree6933c30c5b94e429f1c452c83dc91f4359c0c879 /mm
parentc17dda40a6a4ed95f035db38b7ba4fab0d99da44 (diff)
downloadop-kernel-dev-f6e7def7f7d749759e4bf36dcc25ae289a20d868.zip
op-kernel-dev-f6e7def7f7d749759e4bf36dcc25ae289a20d868.tar.gz
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')
-rw-r--r--mm/slub.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 2389a01..6b60fc9 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);
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