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[PATCH] mm: optimize numa policy handling in slab allocator 

Move the interrupt check from slab_node into ___cache_alloc and adds an
"unlikely()" to avoid pipeline stalls on some architectures.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-01-18 17:42:37 -08:00 committed by Linus Torvalds
parent dc85da15d4
commit 86c562a9d6
2 changed files with 1 additions and 4 deletions
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3
mm/mempolicy.c
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@ -982,9 +982,6 @@ static unsigned interleave_nodes(struct mempolicy *policy)
*/
unsigned slab_node(struct mempolicy *policy)
{
if (in_interrupt())
return numa_node_id();
switch (policy->policy) {
case MPOL_INTERLEAVE:
return interleave_nodes(policy);

2
mm/slab.c
View File

@ -2574,7 +2574,7 @@ static inline void *____cache_alloc(kmem_cache_t *cachep, gfp_t flags)
struct array_cache *ac;
#ifdef CONFIG_NUMA
if (current->mempolicy) {
if (unlikely(current->mempolicy && !in_interrupt())) {
int nid = slab_node(current->mempolicy);
if (nid != numa_node_id())