[RFC PATCH 3/3] slub: fallback to get_numa_mem() node if we want to allocate on memoryless node

[Joonsoo Kim]

Signed-off-by: Joonsoo Kim <iamjoonsoo....@lge.com>

diff --git a/mm/slub.c b/mm/slub.c
index cc1f995..c851f82 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1700,6 +1700,14 @@ static void *get_partial(struct kmem_cache *s, gfp_t 
flags, int node,
        void *object;
        int searchnode = (node == NUMA_NO_NODE) ? numa_mem_id() : node;
 
+       if (node == NUMA_NO_NODE)
+               searchnode = numa_mem_id();
+       else {
+               searchnode = node;
+               if (!node_present_pages(node))
+                       searchnode = get_numa_mem(node);
+       }
+
        object = get_partial_node(s, get_node(s, searchnode), c, flags);
        if (object || node != NUMA_NO_NODE)
                return object;
@@ -2277,11 +2285,18 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t 
gfpflags, int node,
 redo:
 
        if (unlikely(!node_match(page, node))) {
-               stat(s, ALLOC_NODE_MISMATCH);
-               deactivate_slab(s, page, c->freelist);
-               c->page = NULL;
-               c->freelist = NULL;
-               goto new_slab;
+               int searchnode = node;
+
+               if (node != NUMA_NO_NODE && !node_present_pages(node))
+                       searchnode = get_numa_mem(node);
+
+               if (!node_match(page, searchnode)) {
+                       stat(s, ALLOC_NODE_MISMATCH);
+                       deactivate_slab(s, page, c->freelist);
+                       c->page = NULL;
+                       c->freelist = NULL;
+                       goto new_slab;
+               }
        }
 
        /*
-- 
1.7.9.5

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