diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mempolicy.c | 4 | ||||
| -rw-r--r-- | mm/slab.c | 107 |
2 files changed, 81 insertions, 30 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 38f8965..cf18f09 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1136,7 +1136,9 @@ static unsigned interleave_nodes(struct mempolicy *policy) */ unsigned slab_node(struct mempolicy *policy) { - switch (policy->policy) { + int pol = policy ? policy->policy : MPOL_DEFAULT; + + switch (pol) { case MPOL_INTERLEAVE: return interleave_nodes(policy); @@ -972,7 +972,39 @@ static int transfer_objects(struct array_cache *to, return nr; } -#ifdef CONFIG_NUMA +#ifndef CONFIG_NUMA + +#define drain_alien_cache(cachep, alien) do { } while (0) +#define reap_alien(cachep, l3) do { } while (0) + +static inline struct array_cache **alloc_alien_cache(int node, int limit) +{ + return (struct array_cache **)BAD_ALIEN_MAGIC; +} + +static inline void free_alien_cache(struct array_cache **ac_ptr) +{ +} + +static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) +{ + return 0; +} + +static inline void *alternate_node_alloc(struct kmem_cache *cachep, + gfp_t flags) +{ + return NULL; +} + +static inline void *__cache_alloc_node(struct kmem_cache *cachep, + gfp_t flags, int nodeid) +{ + return NULL; +} + +#else /* CONFIG_NUMA */ + static void *__cache_alloc_node(struct kmem_cache *, gfp_t, int); static void *alternate_node_alloc(struct kmem_cache *, gfp_t); @@ -1101,26 +1133,6 @@ static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) } return 1; } - -#else - -#define drain_alien_cache(cachep, alien) do { } while (0) -#define reap_alien(cachep, l3) do { } while (0) - -static inline struct array_cache **alloc_alien_cache(int node, int limit) -{ - return (struct array_cache **)BAD_ALIEN_MAGIC; -} - -static inline void free_alien_cache(struct array_cache **ac_ptr) -{ -} - -static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) -{ - return 0; -} - #endif static int __cpuinit cpuup_callback(struct notifier_block *nfb, @@ -1564,7 +1576,13 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) */ flags |= __GFP_COMP; #endif - flags |= cachep->gfpflags; + + /* + * 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; page = alloc_pages_node(nodeid, flags, cachep->gfporder); if (!page) @@ -3051,13 +3069,18 @@ static __always_inline void *__cache_alloc(struct kmem_cache *cachep, local_irq_save(save_flags); -#ifdef CONFIG_NUMA - if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) + if (unlikely(NUMA_BUILD && + current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) objp = alternate_node_alloc(cachep, flags); -#endif if (!objp) objp = ____cache_alloc(cachep, flags); + /* + * We may just have run out of memory on the local node. + * __cache_alloc_node() knows how to locate memory on other nodes + */ + if (NUMA_BUILD && !objp) + objp = __cache_alloc_node(cachep, flags, numa_node_id()); local_irq_restore(save_flags); objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller); @@ -3076,7 +3099,7 @@ static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags) { int nid_alloc, nid_here; - if (in_interrupt()) + if (in_interrupt() || (flags & __GFP_THISNODE)) return NULL; nid_alloc = nid_here = numa_node_id(); if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD)) @@ -3089,6 +3112,28 @@ 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. + */ +void *fallback_alloc(struct kmem_cache *cache, gfp_t flags) +{ + struct zonelist *zonelist = &NODE_DATA(slab_node(current->mempolicy)) + ->node_zonelists[gfp_zone(flags)]; + struct zone **z; + void *obj = NULL; + + for (z = zonelist->zones; *z && !obj; z++) + if (zone_idx(*z) <= ZONE_NORMAL && + cpuset_zone_allowed(*z, flags)) + obj = __cache_alloc_node(cache, + flags | __GFP_THISNODE, + zone_to_nid(*z)); + return obj; +} + +/* * A interface to enable slab creation on nodeid */ static void *__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, @@ -3141,11 +3186,15 @@ retry: must_grow: spin_unlock(&l3->list_lock); x = cache_grow(cachep, flags, nodeid); + if (x) + goto retry; - if (!x) - return NULL; + if (!(flags & __GFP_THISNODE)) + /* Unable to grow the cache. Fall back to other nodes. */ + return fallback_alloc(cachep, flags); + + return NULL; - goto retry; done: return obj; } |
