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-rw-r--r--include/linux/mempolicy.h1
-rw-r--r--mm/mempolicy.c30
-rw-r--r--mm/slab.c12
3 files changed, 43 insertions, 0 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index d6a53ed..bbd2221 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -159,6 +159,7 @@ extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
extern struct mempolicy default_policy;
extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
unsigned long addr);
+extern unsigned slab_node(struct mempolicy *policy);
extern int policy_zone;
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index a683a66..71430d4 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -976,6 +976,36 @@ static unsigned interleave_nodes(struct mempolicy *policy)
return nid;
}
+/*
+ * Depending on the memory policy provide a node from which to allocate the
+ * next slab entry.
+ */
+unsigned slab_node(struct mempolicy *policy)
+{
+ if (in_interrupt())
+ return numa_node_id();
+
+ switch (policy->policy) {
+ case MPOL_INTERLEAVE:
+ return interleave_nodes(policy);
+
+ case MPOL_BIND:
+ /*
+ * Follow bind policy behavior and start allocation at the
+ * first node.
+ */
+ return policy->v.zonelist->zones[0]->zone_pgdat->node_id;
+
+ case MPOL_PREFERRED:
+ if (policy->v.preferred_node >= 0)
+ return policy->v.preferred_node;
+ /* Fall through */
+
+ default:
+ return numa_node_id();
+ }
+}
+
/* Do static interleaving for a VMA with known offset. */
static unsigned offset_il_node(struct mempolicy *pol,
struct vm_area_struct *vma, unsigned long off)
diff --git a/mm/slab.c b/mm/slab.c
index bd0317f..9025608 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -103,6 +103,7 @@
#include <linux/rcupdate.h>
#include <linux/string.h>
#include <linux/nodemask.h>
+#include <linux/mempolicy.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
@@ -773,6 +774,8 @@ static struct array_cache *alloc_arraycache(int node, int entries,
}
#ifdef CONFIG_NUMA
+static void *__cache_alloc_node(kmem_cache_t *, gfp_t, int);
+
static inline struct array_cache **alloc_alien_cache(int node, int limit)
{
struct array_cache **ac_ptr;
@@ -2570,6 +2573,15 @@ static inline void *____cache_alloc(kmem_cache_t *cachep, gfp_t flags)
void *objp;
struct array_cache *ac;
+#ifdef CONFIG_NUMA
+ if (current->mempolicy) {
+ int nid = slab_node(current->mempolicy);
+
+ if (nid != numa_node_id())
+ return __cache_alloc_node(cachep, flags, nid);
+ }
+#endif
+
check_irq_off();
ac = ac_data(cachep);
if (likely(ac->avail)) {
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