diff options
| -rw-r--r-- | include/linux/memcontrol.h | 56 | ||||
| -rw-r--r-- | include/linux/mmzone.h | 13 | ||||
| -rw-r--r-- | mm/memcontrol.c | 25 | ||||
| -rw-r--r-- | mm/vmscan.c | 18 | ||||
| -rw-r--r-- | mm/workingset.c | 79 |
5 files changed, 134 insertions, 57 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 8502fd4144eb..09b449849369 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -89,6 +89,10 @@ enum mem_cgroup_events_target { }; #ifdef CONFIG_MEMCG + +#define MEM_CGROUP_ID_SHIFT 16 +#define MEM_CGROUP_ID_MAX USHRT_MAX + struct mem_cgroup_stat_cpu { long count[MEMCG_NR_STAT]; unsigned long events[MEMCG_NR_EVENTS]; @@ -265,6 +269,11 @@ struct mem_cgroup { extern struct mem_cgroup *root_mem_cgroup; +static inline bool mem_cgroup_disabled(void) +{ + return !cgroup_subsys_enabled(memory_cgrp_subsys); +} + /** * mem_cgroup_events - count memory events against a cgroup * @memcg: the memory cgroup @@ -312,6 +321,28 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, struct mem_cgroup_reclaim_cookie *); void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); +static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) +{ + if (mem_cgroup_disabled()) + return 0; + + return memcg->css.id; +} + +/** + * mem_cgroup_from_id - look up a memcg from an id + * @id: the id to look up + * + * Caller must hold rcu_read_lock() and use css_tryget() as necessary. + */ +static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) +{ + struct cgroup_subsys_state *css; + + css = css_from_id(id, &memory_cgrp_subsys); + return mem_cgroup_from_css(css); +} + /** * parent_mem_cgroup - find the accounting parent of a memcg * @memcg: memcg whose parent to find @@ -353,11 +384,6 @@ static inline bool mm_match_cgroup(struct mm_struct *mm, struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page); ino_t page_cgroup_ino(struct page *page); -static inline bool mem_cgroup_disabled(void) -{ - return !cgroup_subsys_enabled(memory_cgrp_subsys); -} - static inline bool mem_cgroup_online(struct mem_cgroup *memcg) { if (mem_cgroup_disabled()) @@ -502,8 +528,17 @@ void mem_cgroup_split_huge_fixup(struct page *head); #endif #else /* CONFIG_MEMCG */ + +#define MEM_CGROUP_ID_SHIFT 0 +#define MEM_CGROUP_ID_MAX 0 + struct mem_cgroup; +static inline bool mem_cgroup_disabled(void) +{ + return true; +} + static inline void mem_cgroup_events(struct mem_cgroup *memcg, enum mem_cgroup_events_index idx, unsigned int nr) @@ -586,9 +621,16 @@ static inline void mem_cgroup_iter_break(struct mem_cgroup *root, { } -static inline bool mem_cgroup_disabled(void) +static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) { - return true; + return 0; +} + +static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) +{ + WARN_ON_ONCE(id); + /* XXX: This should always return root_mem_cgroup */ + return NULL; } static inline bool mem_cgroup_online(struct mem_cgroup *memcg) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 9fc23ab550a7..03cbdd906f55 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -212,10 +212,12 @@ struct zone_reclaim_stat { }; struct lruvec { - struct list_head lists[NR_LRU_LISTS]; - struct zone_reclaim_stat reclaim_stat; + struct list_head lists[NR_LRU_LISTS]; + struct zone_reclaim_stat reclaim_stat; + /* Evictions & activations on the inactive file list */ + atomic_long_t inactive_age; #ifdef CONFIG_MEMCG - struct zone *zone; + struct zone *zone; #endif }; @@ -490,9 +492,6 @@ struct zone { spinlock_t lru_lock; struct lruvec lruvec; - /* Evictions & activations on the inactive file list */ - atomic_long_t inactive_age; - /* * When free pages are below this point, additional steps are taken * when reading the number of free pages to avoid per-cpu counter @@ -761,6 +760,8 @@ static inline struct zone *lruvec_zone(struct lruvec *lruvec) #endif } +extern unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru); + #ifdef CONFIG_HAVE_MEMORY_PRESENT void memory_present(int nid, unsigned long start, unsigned long end); #else diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 953f0f984392..864e237f32d9 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -268,31 +268,6 @@ static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) return (memcg == root_mem_cgroup); } -/* - * We restrict the id in the range of [1, 65535], so it can fit into - * an unsigned short. - */ -#define MEM_CGROUP_ID_MAX USHRT_MAX - -static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) -{ - return memcg->css.id; -} - -/* - * A helper function to get mem_cgroup from ID. must be called under - * rcu_read_lock(). The caller is responsible for calling - * css_tryget_online() if the mem_cgroup is used for charging. (dropping - * refcnt from swap can be called against removed memcg.) - */ -static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) -{ - struct cgroup_subsys_state *css; - - css = css_from_id(id, &memory_cgrp_subsys); - return mem_cgroup_from_css(css); -} - #ifndef CONFIG_SLOB /* * This will be the memcg's index in each cache's ->memcg_params.memcg_caches. diff --git a/mm/vmscan.c b/mm/vmscan.c index 08547a7136d3..fd434cc89bea 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -213,7 +213,7 @@ bool zone_reclaimable(struct zone *zone) zone_reclaimable_pages(zone) * 6; } -static unsigned long get_lru_size(struct lruvec *lruvec, enum lru_list lru) +unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru) { if (!mem_cgroup_disabled()) return mem_cgroup_get_lru_size(lruvec, lru); @@ -1923,8 +1923,8 @@ static bool inactive_file_is_low(struct lruvec *lruvec) unsigned long inactive; unsigned long active; - inactive = get_lru_size(lruvec, LRU_INACTIVE_FILE); - active = get_lru_size(lruvec, LRU_ACTIVE_FILE); + inactive = lruvec_lru_size(lruvec, LRU_INACTIVE_FILE); + active = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE); return active > inactive; } @@ -2063,7 +2063,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg, * system is under heavy pressure. */ if (!inactive_file_is_low(lruvec) && - get_lru_size(lruvec, LRU_INACTIVE_FILE) >> sc->priority) { + lruvec_lru_size(lruvec, LRU_INACTIVE_FILE) >> sc->priority) { scan_balance = SCAN_FILE; goto out; } @@ -2089,10 +2089,10 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg, * anon in [0], file in [1] */ - anon = get_lru_size(lruvec, LRU_ACTIVE_ANON) + - get_lru_size(lruvec, LRU_INACTIVE_ANON); - file = get_lru_size(lruvec, LRU_ACTIVE_FILE) + - get_lru_size(lruvec, LRU_INACTIVE_FILE); + anon = lruvec_lru_size(lruvec, LRU_ACTIVE_ANON) + + lruvec_lru_size(lruvec, LRU_INACTIVE_ANON); + file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE) + + lruvec_lru_size(lruvec, LRU_INACTIVE_FILE); spin_lock_irq(&zone->lru_lock); if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) { @@ -2130,7 +2130,7 @@ out: unsigned long size; unsigned long scan; - size = get_lru_size(lruvec, lru); + size = lruvec_lru_size(lruvec, lru); scan = size >> sc->priority; if (!scan && pass && force_scan) diff --git a/mm/workingset.c b/mm/workingset.c index 9a26a60368d2..14bc23a7779b 100644 --- a/mm/workingset.c +++ b/mm/workingset.c @@ -153,7 +153,8 @@ */ #define EVICTION_SHIFT (RADIX_TREE_EXCEPTIONAL_ENTRY + \ - ZONES_SHIFT + NODES_SHIFT) + ZONES_SHIFT + NODES_SHIFT + \ + MEM_CGROUP_ID_SHIFT) #define EVICTION_MASK (~0UL >> EVICTION_SHIFT) /* @@ -166,9 +167,10 @@ */ static unsigned int bucket_order __read_mostly; -static void *pack_shadow(unsigned long eviction, struct zone *zone) +static void *pack_shadow(int memcgid, struct zone *zone, unsigned long eviction) { eviction >>= bucket_order; + eviction = (eviction << MEM_CGROUP_ID_SHIFT) | memcgid; eviction = (eviction << NODES_SHIFT) | zone_to_nid(zone); eviction = (eviction << ZONES_SHIFT) | zone_idx(zone); eviction = (eviction << RADIX_TREE_EXCEPTIONAL_SHIFT); @@ -176,18 +178,21 @@ static void *pack_shadow(unsigned long eviction, struct zone *zone) return (void *)(eviction | RADIX_TREE_EXCEPTIONAL_ENTRY); } -static void unpack_shadow(void *shadow, struct zone **zonep, +static void unpack_shadow(void *shadow, int *memcgidp, struct zone **zonep, unsigned long *evictionp) { unsigned long entry = (unsigned long)shadow; - int zid, nid; + int memcgid, nid, zid; entry >>= RADIX_TREE_EXCEPTIONAL_SHIFT; zid = entry & ((1UL << ZONES_SHIFT) - 1); entry >>= ZONES_SHIFT; nid = entry & ((1UL << NODES_SHIFT) - 1); entry >>= NODES_SHIFT; + memcgid = entry & ((1UL << MEM_CGROUP_ID_SHIFT) - 1); + entry >>= MEM_CGROUP_ID_SHIFT; + *memcgidp = memcgid; *zonep = NODE_DATA(nid)->node_zones + zid; *evictionp = entry << bucket_order; } @@ -202,11 +207,20 @@ static void unpack_shadow(void *shadow, struct zone **zonep, */ void *workingset_eviction(struct address_space *mapping, struct page *page) { + struct mem_cgroup *memcg = page_memcg(page); struct zone *zone = page_zone(page); + int memcgid = mem_cgroup_id(memcg); unsigned long eviction; + struct lruvec *lruvec; - eviction = atomic_long_inc_return(&zone->inactive_age); - return pack_shadow(eviction, zone); + /* Page is fully exclusive and pins page->mem_cgroup */ + VM_BUG_ON_PAGE(PageLRU(page), page); + VM_BUG_ON_PAGE(page_count(page), page); + VM_BUG_ON_PAGE(!PageLocked(page), page); + + lruvec = mem_cgroup_zone_lruvec(zone, memcg); + eviction = atomic_long_inc_return(&lruvec->inactive_age); + return pack_shadow(memcgid, zone, eviction); } /** @@ -221,13 +235,42 @@ void *workingset_eviction(struct address_space *mapping, struct page *page) bool workingset_refault(void *shadow) { unsigned long refault_distance; + unsigned long active_file; + struct mem_cgroup *memcg; unsigned long eviction; + struct lruvec *lruvec; unsigned long refault; struct zone *zone; + int memcgid; - unpack_shadow(shadow, &zone, &eviction); + unpack_shadow(shadow, &memcgid, &zone, &eviction); - refault = atomic_long_read(&zone->inactive_age); + rcu_read_lock(); + /* + * Look up the memcg associated with the stored ID. It might + * have been deleted since the page's eviction. + * + * Note that in rare events the ID could have been recycled + * for a new cgroup that refaults a shared page. This is + * impossible to tell from the available data. However, this + * should be a rare and limited disturbance, and activations + * are always speculative anyway. Ultimately, it's the aging + * algorithm's job to shake out the minimum access frequency + * for the active cache. + * + * XXX: On !CONFIG_MEMCG, this will always return NULL; it + * would be better if the root_mem_cgroup existed in all + * configurations instead. + */ + memcg = mem_cgroup_from_id(memcgid); + if (!mem_cgroup_disabled() && !memcg) { + rcu_read_unlock(); + return false; + } + lruvec = mem_cgroup_zone_lruvec(zone, memcg); + refault = atomic_long_read(&lruvec->inactive_age); + active_file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE); + rcu_read_unlock(); /* * The unsigned subtraction here gives an accurate distance @@ -249,7 +292,7 @@ bool workingset_refault(void *shadow) inc_zone_state(zone, WORKINGSET_REFAULT); - if (refault_distance <= zone_page_state(zone, NR_ACTIVE_FILE)) { + if (refault_distance <= active_file) { inc_zone_state(zone, WORKINGSET_ACTIVATE); return true; } @@ -262,7 +305,23 @@ bool workingset_refault(void *shadow) */ void workingset_activation(struct page *page) { - atomic_long_inc(&page_zone(page)->inactive_age); + struct mem_cgroup *memcg; + struct lruvec *lruvec; + + memcg = lock_page_memcg(page); + /* + * Filter non-memcg pages here, e.g. unmap can call + * mark_page_accessed() on VDSO pages. + * + * XXX: See workingset_refault() - this should return + * root_mem_cgroup even for !CONFIG_MEMCG. + */ + if (!mem_cgroup_disabled() && !memcg) + goto out; + lruvec = mem_cgroup_zone_lruvec(page_zone(page), memcg); + atomic_long_inc(&lruvec->inactive_age); +out: + unlock_page_memcg(memcg); } /* |