diff options
| -rw-r--r-- | mm/memcontrol.c | 41 |
1 files changed, 26 insertions, 15 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 972f822b142b..ae0433885b69 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -180,7 +180,7 @@ struct mem_cgroup_per_node { }; struct mem_cgroup_lru_info { - struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES]; + struct mem_cgroup_per_node *nodeinfo[0]; }; /* @@ -284,17 +284,6 @@ struct mem_cgroup { */ struct res_counter kmem; /* - * Per cgroup active and inactive list, similar to the - * per zone LRU lists. - */ - struct mem_cgroup_lru_info info; - int last_scanned_node; -#if MAX_NUMNODES > 1 - nodemask_t scan_nodes; - atomic_t numainfo_events; - atomic_t numainfo_updating; -#endif - /* * Should the accounting and control be hierarchical, per subtree? */ bool use_hierarchy; @@ -357,8 +346,29 @@ struct mem_cgroup { /* Index in the kmem_cache->memcg_params->memcg_caches array */ int kmemcg_id; #endif + + int last_scanned_node; +#if MAX_NUMNODES > 1 + nodemask_t scan_nodes; + atomic_t numainfo_events; + atomic_t numainfo_updating; +#endif + /* + * Per cgroup active and inactive list, similar to the + * per zone LRU lists. + * + * WARNING: This has to be the last element of the struct. Don't + * add new fields after this point. + */ + struct mem_cgroup_lru_info info; }; +static size_t memcg_size(void) +{ + return sizeof(struct mem_cgroup) + + nr_node_ids * sizeof(struct mem_cgroup_per_node); +} + /* internal only representation about the status of kmem accounting. */ enum { KMEM_ACCOUNTED_ACTIVE = 0, /* accounted by this cgroup itself */ @@ -635,6 +645,7 @@ static void drain_all_stock_async(struct mem_cgroup *memcg); static struct mem_cgroup_per_zone * mem_cgroup_zoneinfo(struct mem_cgroup *memcg, int nid, int zid) { + VM_BUG_ON((unsigned)nid >= nr_node_ids); return &memcg->info.nodeinfo[nid]->zoneinfo[zid]; } @@ -5925,9 +5936,9 @@ static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node) static struct mem_cgroup *mem_cgroup_alloc(void) { struct mem_cgroup *memcg; - int size = sizeof(struct mem_cgroup); + size_t size = memcg_size(); - /* Can be very big if MAX_NUMNODES is very big */ + /* Can be very big if nr_node_ids is very big */ if (size < PAGE_SIZE) memcg = kzalloc(size, GFP_KERNEL); else @@ -5964,7 +5975,7 @@ out_free: static void __mem_cgroup_free(struct mem_cgroup *memcg) { int node; - int size = sizeof(struct mem_cgroup); + size_t size = memcg_size(); mem_cgroup_remove_from_trees(memcg); free_css_id(&mem_cgroup_subsys, &memcg->css); |
