From 86c562a9d6683063e071692fe14e0a18e64ee1be Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Wed, 18 Jan 2006 17:42:37 -0800 Subject: [PATCH] [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/mempolicy.c | 3 --- mm/slab.c | 2 +- 2 files changed, 1 insertion(+), 4 deletions(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 71430d44082..73790188b0e 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -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); diff --git a/mm/slab.c b/mm/slab.c index 9025608696e..6f8495e2185 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -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()) -- 2.41.1