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

[Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>]

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

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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