1 files changed, 28 insertions, 13 deletions

diff --git a/mm/slab.c b/mm/slab.c
index de516658d3d8..f80b52388a12 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -899,6 +899,7 @@ static struct array_cache *alloc_arraycache(int node, int entries,
 
 #ifdef CONFIG_NUMA
 static void *__cache_alloc_node(struct kmem_cache *, gfp_t, int);
+static void *alternate_node_alloc(struct kmem_cache *, gfp_t);
 
 static struct array_cache **alloc_alien_cache(int node, int limit)
 {
@@ -2808,19 +2809,11 @@ static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags)
         struct array_cache *ac;
 
 #ifdef CONFIG_NUMA
-        if (unlikely(current->mempolicy && !in_interrupt())) {
-                int nid = slab_node(current->mempolicy);
-
-                if (nid != numa_node_id())
-                        return __cache_alloc_node(cachep, flags, nid);
-        }
-        if (unlikely(cpuset_do_slab_mem_spread() &&
-                                        (cachep->flags & SLAB_MEM_SPREAD) &&
-                                        !in_interrupt())) {
-                int nid = cpuset_mem_spread_node();
-
-                if (nid != numa_node_id())
-                        return __cache_alloc_node(cachep, flags, nid);
+        if (unlikely(current->flags & (PF_SPREAD_PAGE | PF_SPREAD_SLAB |
+                                                        PF_MEMPOLICY))) {
+                objp = alternate_node_alloc(cachep, flags);
+                if (objp != NULL)
+                        return objp;
         }
 #endif
 
@@ -2856,6 +2849,28 @@ static __always_inline void *__cache_alloc(struct kmem_cache *cachep,
 
 #ifdef CONFIG_NUMA
 /*
+ * Try allocating on another node if PF_SPREAD_PAGE|PF_SPREAD_SLAB|PF_MEMPOLICY.
+ *
+ * If we are in_interrupt, then process context, including cpusets and
+ * mempolicy, may not apply and should not be used for allocation policy.
+ */
+static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags)
+{
+        int nid_alloc, nid_here;
+
+        if (in_interrupt())
+                return NULL;
+        nid_alloc = nid_here = numa_node_id();
+        if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD))
+                nid_alloc = cpuset_mem_spread_node();
+        else if (current->mempolicy)
+                nid_alloc = slab_node(current->mempolicy);
+        if (nid_alloc != nid_here)
+                return __cache_alloc_node(cachep, flags, nid_alloc);
+        return NULL;
+}
+
+/*
  * A interface to enable slab creation on nodeid
  */
 static void *__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,