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Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c79
1 files changed, 57 insertions, 22 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 6da554fd3f6..7b8e5d66858 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1605,12 +1605,7 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid)
flags |= __GFP_COMP;
#endif
- /*
- * Under NUMA we want memory on the indicated node. We will handle
- * the needed fallback ourselves since we want to serve from our
- * per node object lists first for other nodes.
- */
- flags |= cachep->gfpflags | GFP_THISNODE;
+ flags |= cachep->gfpflags;
page = alloc_pages_node(nodeid, flags, cachep->gfporder);
if (!page)
@@ -2567,7 +2562,7 @@ static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp,
if (OFF_SLAB(cachep)) {
/* Slab management obj is off-slab. */
slabp = kmem_cache_alloc_node(cachep->slabp_cache,
- local_flags, nodeid);
+ local_flags & ~GFP_THISNODE, nodeid);
if (!slabp)
return NULL;
} else {
@@ -2708,10 +2703,10 @@ static void slab_map_pages(struct kmem_cache *cache, struct slab *slab,
* Grow (by 1) the number of slabs within a cache. This is called by
* kmem_cache_alloc() when there are no active objs left in a cache.
*/
-static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid)
+static int cache_grow(struct kmem_cache *cachep,
+ gfp_t flags, int nodeid, void *objp)
{
struct slab *slabp;
- void *objp;
size_t offset;
gfp_t local_flags;
unsigned long ctor_flags;
@@ -2763,12 +2758,14 @@ static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid)
* Get mem for the objs. Attempt to allocate a physical page from
* 'nodeid'.
*/
- objp = kmem_getpages(cachep, flags, nodeid);
+ if (!objp)
+ objp = kmem_getpages(cachep, flags, nodeid);
if (!objp)
goto failed;
/* Get slab management. */
- slabp = alloc_slabmgmt(cachep, objp, offset, local_flags, nodeid);
+ slabp = alloc_slabmgmt(cachep, objp, offset,
+ local_flags & ~GFP_THISNODE, nodeid);
if (!slabp)
goto opps1;
@@ -3006,7 +3003,7 @@ alloc_done:
if (unlikely(!ac->avail)) {
int x;
- x = cache_grow(cachep, flags, node);
+ x = cache_grow(cachep, flags | GFP_THISNODE, node, NULL);
/* cache_grow can reenable interrupts, then ac could change. */
ac = cpu_cache_get(cachep);
@@ -3166,9 +3163,11 @@ static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags)
/*
* Fallback function if there was no memory available and no objects on a
- * certain node and we are allowed to fall back. We mimick the behavior of
- * the page allocator. We fall back according to a zonelist determined by
- * the policy layer while obeying cpuset constraints.
+ * certain node and fall back is permitted. First we scan all the
+ * available nodelists for available objects. If that fails then we
+ * perform an allocation without specifying a node. This allows the page
+ * allocator to do its reclaim / fallback magic. We then insert the
+ * slab into the proper nodelist and then allocate from it.
*/
void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
{
@@ -3176,15 +3175,51 @@ void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
->node_zonelists[gfp_zone(flags)];
struct zone **z;
void *obj = NULL;
+ int nid;
+retry:
+ /*
+ * Look through allowed nodes for objects available
+ * from existing per node queues.
+ */
for (z = zonelist->zones; *z && !obj; z++) {
- int nid = zone_to_nid(*z);
+ nid = zone_to_nid(*z);
+
+ if (cpuset_zone_allowed(*z, flags) &&
+ cache->nodelists[nid] &&
+ cache->nodelists[nid]->free_objects)
+ obj = ____cache_alloc_node(cache,
+ flags | GFP_THISNODE, nid);
+ }
- if (zone_idx(*z) <= ZONE_NORMAL &&
- cpuset_zone_allowed(*z, flags) &&
- cache->nodelists[nid])
- obj = ____cache_alloc_node(cache,
- flags | __GFP_THISNODE, nid);
+ if (!obj) {
+ /*
+ * This allocation will be performed within the constraints
+ * of the current cpuset / memory policy requirements.
+ * We may trigger various forms of reclaim on the allowed
+ * set and go into memory reserves if necessary.
+ */
+ obj = kmem_getpages(cache, flags, -1);
+ if (obj) {
+ /*
+ * Insert into the appropriate per node queues
+ */
+ nid = page_to_nid(virt_to_page(obj));
+ if (cache_grow(cache, flags, nid, obj)) {
+ obj = ____cache_alloc_node(cache,
+ flags | GFP_THISNODE, nid);
+ if (!obj)
+ /*
+ * Another processor may allocate the
+ * objects in the slab since we are
+ * not holding any locks.
+ */
+ goto retry;
+ } else {
+ kmem_freepages(cache, obj);
+ obj = NULL;
+ }
+ }
}
return obj;
}
@@ -3241,7 +3276,7 @@ retry:
must_grow:
spin_unlock(&l3->list_lock);
- x = cache_grow(cachep, flags, nodeid);
+ x = cache_grow(cachep, flags | GFP_THISNODE, nodeid, NULL);
if (x)
goto retry;