diff options
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 765 |
1 files changed, 333 insertions, 432 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 31ab9c3f0178..ac35bccadb7b 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -59,7 +59,7 @@ struct cgroup_subsys mem_cgroup_subsys __read_mostly; #define MEM_CGROUP_RECLAIM_RETRIES 5 -struct mem_cgroup *root_mem_cgroup __read_mostly; +static struct mem_cgroup *root_mem_cgroup __read_mostly; #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP /* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */ @@ -73,7 +73,7 @@ static int really_do_swap_account __initdata = 0; #endif #else -#define do_swap_account (0) +#define do_swap_account 0 #endif @@ -88,18 +88,31 @@ enum mem_cgroup_stat_index { MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */ MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */ MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */ - MEM_CGROUP_STAT_DATA, /* end of data requires synchronization */ MEM_CGROUP_STAT_NSTATS, }; +static const char * const mem_cgroup_stat_names[] = { + "cache", + "rss", + "mapped_file", + "swap", +}; + enum mem_cgroup_events_index { MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */ MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */ - MEM_CGROUP_EVENTS_COUNT, /* # of pages paged in/out */ MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */ MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */ MEM_CGROUP_EVENTS_NSTATS, }; + +static const char * const mem_cgroup_events_names[] = { + "pgpgin", + "pgpgout", + "pgfault", + "pgmajfault", +}; + /* * Per memcg event counter is incremented at every pagein/pageout. With THP, * it will be incremated by the number of pages. This counter is used for @@ -112,13 +125,14 @@ enum mem_cgroup_events_target { MEM_CGROUP_TARGET_NUMAINFO, MEM_CGROUP_NTARGETS, }; -#define THRESHOLDS_EVENTS_TARGET (128) -#define SOFTLIMIT_EVENTS_TARGET (1024) -#define NUMAINFO_EVENTS_TARGET (1024) +#define THRESHOLDS_EVENTS_TARGET 128 +#define SOFTLIMIT_EVENTS_TARGET 1024 +#define NUMAINFO_EVENTS_TARGET 1024 struct mem_cgroup_stat_cpu { long count[MEM_CGROUP_STAT_NSTATS]; unsigned long events[MEM_CGROUP_EVENTS_NSTATS]; + unsigned long nr_page_events; unsigned long targets[MEM_CGROUP_NTARGETS]; }; @@ -138,7 +152,6 @@ struct mem_cgroup_per_zone { struct mem_cgroup_reclaim_iter reclaim_iter[DEF_PRIORITY + 1]; - struct zone_reclaim_stat reclaim_stat; struct rb_node tree_node; /* RB tree node */ unsigned long long usage_in_excess;/* Set to the value by which */ /* the soft limit is exceeded*/ @@ -182,7 +195,7 @@ struct mem_cgroup_threshold { /* For threshold */ struct mem_cgroup_threshold_ary { - /* An array index points to threshold just below usage. */ + /* An array index points to threshold just below or equal to usage. */ int current_threshold; /* Size of entries[] */ unsigned int size; @@ -245,8 +258,8 @@ struct mem_cgroup { */ struct rcu_head rcu_freeing; /* - * But when using vfree(), that cannot be done at - * interrupt time, so we must then queue the work. + * We also need some space for a worker in deferred freeing. + * By the time we call it, rcu_freeing is no longer in use. */ struct work_struct work_freeing; }; @@ -305,7 +318,7 @@ struct mem_cgroup { /* * percpu counter. */ - struct mem_cgroup_stat_cpu *stat; + struct mem_cgroup_stat_cpu __percpu *stat; /* * used when a cpu is offlined or other synchronizations * See mem_cgroup_read_stat(). @@ -360,8 +373,8 @@ static bool move_file(void) * Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft * limit reclaim to prevent infinite loops, if they ever occur. */ -#define MEM_CGROUP_MAX_RECLAIM_LOOPS (100) -#define MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS (2) +#define MEM_CGROUP_MAX_RECLAIM_LOOPS 100 +#define MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS 2 enum charge_type { MEM_CGROUP_CHARGE_TYPE_CACHE = 0, @@ -377,8 +390,8 @@ enum charge_type { #define _MEM (0) #define _MEMSWAP (1) #define _OOM_TYPE (2) -#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val)) -#define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff) +#define MEMFILE_PRIVATE(x, val) ((x) << 16 | (val)) +#define MEMFILE_TYPE(val) ((val) >> 16 & 0xffff) #define MEMFILE_ATTR(val) ((val) & 0xffff) /* Used for OOM nofiier */ #define OOM_CONTROL (0) @@ -404,6 +417,7 @@ void sock_update_memcg(struct sock *sk) { if (mem_cgroup_sockets_enabled) { struct mem_cgroup *memcg; + struct cg_proto *cg_proto; BUG_ON(!sk->sk_prot->proto_cgroup); @@ -423,9 +437,10 @@ void sock_update_memcg(struct sock *sk) rcu_read_lock(); memcg = mem_cgroup_from_task(current); - if (!mem_cgroup_is_root(memcg)) { + cg_proto = sk->sk_prot->proto_cgroup(memcg); + if (!mem_cgroup_is_root(memcg) && memcg_proto_active(cg_proto)) { mem_cgroup_get(memcg); - sk->sk_cgrp = sk->sk_prot->proto_cgroup(memcg); + sk->sk_cgrp = cg_proto; } rcu_read_unlock(); } @@ -454,6 +469,19 @@ EXPORT_SYMBOL(tcp_proto_cgroup); #endif /* CONFIG_INET */ #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */ +#if defined(CONFIG_INET) && defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) +static void disarm_sock_keys(struct mem_cgroup *memcg) +{ + if (!memcg_proto_activated(&memcg->tcp_mem.cg_proto)) + return; + static_key_slow_dec(&memcg_socket_limit_enabled); +} +#else +static void disarm_sock_keys(struct mem_cgroup *memcg) +{ +} +#endif + static void drain_all_stock_async(struct mem_cgroup *memcg); static struct mem_cgroup_per_zone * @@ -718,12 +746,21 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg, nr_pages = -nr_pages; /* for event */ } - __this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_COUNT], nr_pages); + __this_cpu_add(memcg->stat->nr_page_events, nr_pages); preempt_enable(); } unsigned long +mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) +{ + struct mem_cgroup_per_zone *mz; + + mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); + return mz->lru_size[lru]; +} + +static unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid, unsigned int lru_mask) { @@ -770,7 +807,7 @@ static bool mem_cgroup_event_ratelimit(struct mem_cgroup *memcg, { unsigned long val, next; - val = __this_cpu_read(memcg->stat->events[MEM_CGROUP_EVENTS_COUNT]); + val = __this_cpu_read(memcg->stat->nr_page_events); next = __this_cpu_read(memcg->stat->targets[target]); /* from time_after() in jiffies.h */ if ((long)next - (long)val < 0) { @@ -1013,7 +1050,7 @@ EXPORT_SYMBOL(mem_cgroup_count_vm_event); /** * mem_cgroup_zone_lruvec - get the lru list vector for a zone and memcg * @zone: zone of the wanted lruvec - * @mem: memcg of the wanted lruvec + * @memcg: memcg of the wanted lruvec * * Returns the lru list vector holding pages for the given @zone and * @mem. This can be the global zone lruvec, if the memory controller @@ -1046,19 +1083,11 @@ struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, */ /** - * mem_cgroup_lru_add_list - account for adding an lru page and return lruvec - * @zone: zone of the page + * mem_cgroup_page_lruvec - return lruvec for adding an lru page * @page: the page - * @lru: current lru - * - * This function accounts for @page being added to @lru, and returns - * the lruvec for the given @zone and the memcg @page is charged to. - * - * The callsite is then responsible for physically linking the page to - * the returned lruvec->lists[@lru]. + * @zone: zone of the page */ -struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, struct page *page, - enum lru_list lru) +struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct zone *zone) { struct mem_cgroup_per_zone *mz; struct mem_cgroup *memcg; @@ -1071,7 +1100,7 @@ struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, struct page *page, memcg = pc->mem_cgroup; /* - * Surreptitiously switch any uncharged page to root: + * Surreptitiously switch any uncharged offlist page to root: * an uncharged page off lru does nothing to secure * its former mem_cgroup from sudden removal. * @@ -1079,85 +1108,60 @@ struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, struct page *page, * under page_cgroup lock: between them, they make all uses * of pc->mem_cgroup safe. */ - if (!PageCgroupUsed(pc) && memcg != root_mem_cgroup) + if (!PageLRU(page) && !PageCgroupUsed(pc) && memcg != root_mem_cgroup) pc->mem_cgroup = memcg = root_mem_cgroup; mz = page_cgroup_zoneinfo(memcg, page); - /* compound_order() is stabilized through lru_lock */ - mz->lru_size[lru] += 1 << compound_order(page); return &mz->lruvec; } /** - * mem_cgroup_lru_del_list - account for removing an lru page - * @page: the page - * @lru: target lru - * - * This function accounts for @page being removed from @lru. + * mem_cgroup_update_lru_size - account for adding or removing an lru page + * @lruvec: mem_cgroup per zone lru vector + * @lru: index of lru list the page is sitting on + * @nr_pages: positive when adding or negative when removing * - * The callsite is then responsible for physically unlinking - * @page->lru. + * This function must be called when a page is added to or removed from an + * lru list. */ -void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru) +void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, + int nr_pages) { struct mem_cgroup_per_zone *mz; - struct mem_cgroup *memcg; - struct page_cgroup *pc; + unsigned long *lru_size; if (mem_cgroup_disabled()) return; - pc = lookup_page_cgroup(page); - memcg = pc->mem_cgroup; - VM_BUG_ON(!memcg); - mz = page_cgroup_zoneinfo(memcg, page); - /* huge page split is done under lru_lock. so, we have no races. */ - VM_BUG_ON(mz->lru_size[lru] < (1 << compound_order(page))); - mz->lru_size[lru] -= 1 << compound_order(page); -} - -void mem_cgroup_lru_del(struct page *page) -{ - mem_cgroup_lru_del_list(page, page_lru(page)); -} - -/** - * mem_cgroup_lru_move_lists - account for moving a page between lrus - * @zone: zone of the page - * @page: the page - * @from: current lru - * @to: target lru - * - * This function accounts for @page being moved between the lrus @from - * and @to, and returns the lruvec for the given @zone and the memcg - * @page is charged to. - * - * The callsite is then responsible for physically relinking - * @page->lru to the returned lruvec->lists[@to]. - */ -struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone, - struct page *page, - enum lru_list from, - enum lru_list to) -{ - /* XXX: Optimize this, especially for @from == @to */ - mem_cgroup_lru_del_list(page, from); - return mem_cgroup_lru_add_list(zone, page, to); + mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); + lru_size = mz->lru_size + lru; + *lru_size += nr_pages; + VM_BUG_ON((long)(*lru_size) < 0); } /* * Checks whether given mem is same or in the root_mem_cgroup's * hierarchy subtree */ +bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg, + struct mem_cgroup *memcg) +{ + if (root_memcg == memcg) + return true; + if (!root_memcg->use_hierarchy) + return false; + return css_is_ancestor(&memcg->css, &root_memcg->css); +} + static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg, - struct mem_cgroup *memcg) + struct mem_cgroup *memcg) { - if (root_memcg != memcg) { - return (root_memcg->use_hierarchy && - css_is_ancestor(&memcg->css, &root_memcg->css)); - } + bool ret; - return true; + rcu_read_lock(); + ret = __mem_cgroup_same_or_subtree(root_memcg, memcg); + rcu_read_unlock(); + return ret; } int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg) @@ -1195,19 +1199,15 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg) return ret; } -int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone) +int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) { unsigned long inactive_ratio; - int nid = zone_to_nid(zone); - int zid = zone_idx(zone); unsigned long inactive; unsigned long active; unsigned long gb; - inactive = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid, - BIT(LRU_INACTIVE_ANON)); - active = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid, - BIT(LRU_ACTIVE_ANON)); + inactive = mem_cgroup_get_lru_size(lruvec, LRU_INACTIVE_ANON); + active = mem_cgroup_get_lru_size(lruvec, LRU_ACTIVE_ANON); gb = (inactive + active) >> (30 - PAGE_SHIFT); if (gb) @@ -1218,49 +1218,17 @@ int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone) return inactive * inactive_ratio < active; } -int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone) +int mem_cgroup_inactive_file_is_low(struct lruvec *lruvec) { unsigned long active; unsigned long inactive; - int zid = zone_idx(zone); - int nid = zone_to_nid(zone); - inactive = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid, - BIT(LRU_INACTIVE_FILE)); - active = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid, - BIT(LRU_ACTIVE_FILE)); + inactive = mem_cgroup_get_lru_size(lruvec, LRU_INACTIVE_FILE); + active = mem_cgroup_get_lru_size(lruvec, LRU_ACTIVE_FILE); return (active > inactive); } -struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, - struct zone *zone) -{ - int nid = zone_to_nid(zone); - int zid = zone_idx(zone); - struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid); - - return &mz->reclaim_stat; -} - -struct zone_reclaim_stat * -mem_cgroup_get_reclaim_stat_from_page(struct page *page) -{ - struct page_cgroup *pc; - struct mem_cgroup_per_zone *mz; - - if (mem_cgroup_disabled()) - return NULL; - - pc = lookup_page_cgroup(page); - if (!PageCgroupUsed(pc)) - return NULL; - /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */ - smp_rmb(); - mz = page_cgroup_zoneinfo(pc->mem_cgroup, page); - return &mz->reclaim_stat; -} - #define mem_cgroup_from_res_counter(counter, member) \ container_of(counter, struct mem_cgroup, member) @@ -1634,7 +1602,7 @@ int mem_cgroup_select_victim_node(struct mem_cgroup *memcg) * unused nodes. But scan_nodes is lazily updated and may not cotain * enough new information. We need to do double check. */ -bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap) +static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap) { int nid; @@ -1669,7 +1637,7 @@ int mem_cgroup_select_victim_node(struct mem_cgroup *memcg) return 0; } -bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap) +static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap) { return test_mem_cgroup_node_reclaimable(memcg, 0, noswap); } @@ -1843,7 +1811,8 @@ static void memcg_oom_recover(struct mem_cgroup *memcg) /* * try to call OOM killer. returns false if we should exit memory-reclaim loop. */ -bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask, int order) +static bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask, + int order) { struct oom_wait_info owait; bool locked, need_to_kill; @@ -1992,7 +1961,7 @@ struct memcg_stock_pcp { unsigned int nr_pages; struct work_struct work; unsigned long flags; -#define FLUSHING_CACHED_CHARGE (0) +#define FLUSHING_CACHED_CHARGE 0 }; static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock); static DEFINE_MUTEX(percpu_charge_mutex); @@ -2139,7 +2108,7 @@ static void mem_cgroup_drain_pcp_counter(struct mem_cgroup *memcg, int cpu) int i; spin_lock(&memcg->pcp_counter_lock); - for (i = 0; i < MEM_CGROUP_STAT_DATA; i++) { + for (i = 0; i < MEM_CGROUP_STAT_NSTATS; i++) { long x = per_cpu(memcg->stat->count[i], cpu); per_cpu(memcg->stat->count[i], cpu) = 0; @@ -2427,6 +2396,24 @@ static void __mem_cgroup_cancel_charge(struct mem_cgroup *memcg, } /* + * Cancel chrages in this cgroup....doesn't propagate to parent cgroup. + * This is useful when moving usage to parent cgroup. + */ +static void __mem_cgroup_cancel_local_charge(struct mem_cgroup *memcg, + unsigned int nr_pages) +{ + unsigned long bytes = nr_pages * PAGE_SIZE; + + if (mem_cgroup_is_root(memcg)) + return; + + res_counter_uncharge_until(&memcg->res, memcg->res.parent, bytes); + if (do_swap_account) + res_counter_uncharge_until(&memcg->memsw, + memcg->memsw.parent, bytes); +} + +/* * A helper function to get mem_cgroup from ID. must be called under * rcu_read_lock(). The caller must check css_is_removed() or some if * it's concern. (dropping refcnt from swap can be called against removed @@ -2481,6 +2468,7 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg, { struct page_cgroup *pc = lookup_page_cgroup(page); struct zone *uninitialized_var(zone); + struct lruvec *lruvec; bool was_on_lru = false; bool anon; @@ -2503,8 +2491,9 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg, zone = page_zone(page); spin_lock_irq(&zone->lru_lock); if (PageLRU(page)) { + lruvec = mem_cgroup_zone_lruvec(zone, pc->mem_cgroup); ClearPageLRU(page); - del_page_from_lru_list(zone, page, page_lru(page)); + del_page_from_lru_list(page, lruvec, page_lru(page)); was_on_lru = true; } } @@ -2522,9 +2511,10 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg, if (lrucare) { if (was_on_lru) { + lruvec = mem_cgroup_zone_lruvec(zone, pc->mem_cgroup); VM_BUG_ON(PageLRU(page)); SetPageLRU(page); - add_page_to_lru_list(zone, page, page_lru(page)); + add_page_to_lru_list(page, lruvec, page_lru(page)); } spin_unlock_irq(&zone->lru_lock); } @@ -2547,7 +2537,7 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg, #ifdef CONFIG_TRANSPARENT_HUGEPAGE -#define PCGF_NOCOPY_AT_SPLIT ((1 << PCG_LOCK) | (1 << PCG_MIGRATION)) +#define PCGF_NOCOPY_AT_SPLIT (1 << PCG_LOCK | 1 << PCG_MIGRATION) /* * Because tail pages are not marked as "used", set it. We're under * zone->lru_lock, 'splitting on pmd' and compound_lock. @@ -2578,23 +2568,19 @@ void mem_cgroup_split_huge_fixup(struct page *head) * @pc: page_cgroup of the page. * @from: mem_cgroup which the page is moved from. * @to: mem_cgroup which the page is moved to. @from != @to. - * @uncharge: whether we should call uncharge and css_put against @from. * * The caller must confirm following. * - page is not on LRU (isolate_page() is useful.) * - compound_lock is held when nr_pages > 1 * - * This function doesn't do "charge" nor css_get to new cgroup. It should be - * done by a caller(__mem_cgroup_try_charge would be useful). If @uncharge is - * true, this function does "uncharge" from old cgroup, but it doesn't if - * @uncharge is false, so a caller should do "uncharge". + * This function doesn't do "charge" to new cgroup and doesn't do "uncharge" + * from old cgroup. */ static int mem_cgroup_move_account(struct page *page, unsigned int nr_pages, struct page_cgroup *pc, struct mem_cgroup *from, - struct mem_cgroup *to, - bool uncharge) + struct mem_cgroup *to) { unsigned long flags; int ret; @@ -2628,9 +2614,6 @@ static int mem_cgroup_move_account(struct page *page, preempt_enable(); } mem_cgroup_charge_statistics(from, anon, -nr_pages); - if (uncharge) - /* This is not "cancel", but cancel_charge does all we need. */ - __mem_cgroup_cancel_charge(from, nr_pages); /* caller should have done css_get */ pc->mem_cgroup = to; @@ -2664,15 +2647,13 @@ static int mem_cgroup_move_parent(struct page *page, struct mem_cgroup *child, gfp_t gfp_mask) { - struct cgroup *cg = child->css.cgroup; - struct cgroup *pcg = cg->parent; struct mem_cgroup *parent; unsigned int nr_pages; unsigned long uninitialized_var(flags); int ret; /* Is ROOT ? */ - if (!pcg) + if (mem_cgroup_is_root(child)) return -EINVAL; ret = -EBUSY; @@ -2683,21 +2664,23 @@ static int mem_cgroup_move_parent(struct page *page, nr_pages = hpage_nr_pages(page); - parent = mem_cgroup_from_cont(pcg); - ret = __mem_cgroup_try_charge(NULL, gfp_mask, nr_pages, &parent, false); - if (ret) - goto put_back; + parent = parent_mem_cgroup(child); + /* + * If no parent, move charges to root cgroup. + */ + if (!parent) + parent = root_mem_cgroup; if (nr_pages > 1) flags = compound_lock_irqsave(page); - ret = mem_cgroup_move_account(page, nr_pages, pc, child, parent, true); - if (ret) - __mem_cgroup_cancel_charge(parent, nr_pages); + ret = mem_cgroup_move_account(page, nr_pages, + pc, child, parent); + if (!ret) + __mem_cgroup_cancel_local_charge(child, nr_pages); if (nr_pages > 1) compound_unlock_irqrestore(page, flags); -put_back: putback_lru_page(page); put: put_page(page); @@ -2845,24 +2828,7 @@ __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg, */ if (do_swap_account && PageSwapCache(page)) { swp_entry_t ent = {.val = page_private(page)}; - struct mem_cgroup *swap_memcg; - unsigned short id; - - id = swap_cgroup_record(ent, 0); - rcu_read_lock(); - swap_memcg = mem_cgroup_lookup(id); - if (swap_memcg) { - /* - * This recorded memcg can be obsolete one. So, avoid - * calling css_tryget - */ - if (!mem_cgroup_is_root(swap_memcg)) - res_counter_uncharge(&swap_memcg->memsw, - PAGE_SIZE); - mem_cgroup_swap_statistics(swap_memcg, false); - mem_cgroup_put(swap_memcg); - } - rcu_read_unlock(); + mem_cgroup_uncharge_swap(ent); } /* * At swapin, we may charge account against cgroup which has no tasks. @@ -3155,7 +3121,6 @@ void mem_cgroup_uncharge_swap(swp_entry_t ent) * @entry: swap entry to be moved * @from: mem_cgroup which the entry is moved from * @to: mem_cgroup which the entry is moved to - * @need_fixup: whether we should fixup res_counters and refcounts. * * It succeeds only when the swap_cgroup's record for this entry is the same * as the mem_cgroup's id of @from. @@ -3166,7 +3131,7 @@ void mem_cgroup_uncharge_swap(swp_entry_t ent) * both res and memsw, and called css_get(). */ static int mem_cgroup_move_swap_account(swp_entry_t entry, - struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) + struct mem_cgroup *from, struct mem_cgroup *to) { unsigned short old_id, new_id; @@ -3185,24 +3150,13 @@ static int mem_cgroup_move_swap_account(swp_entry_t entry, * swap-in, the refcount of @to might be decreased to 0. */ mem_cgroup_get(to); - if (need_fixup) { - if (!mem_cgroup_is_root(from)) - res_counter_uncharge(&from->memsw, PAGE_SIZE); - mem_cgroup_put(from); - /* - * we charged both to->res and to->memsw, so we should - * uncharge to->res. - */ - if (!mem_cgroup_is_root(to)) - res_counter_uncharge(&to->res, PAGE_SIZE); - } return 0; } return -EINVAL; } #else static inline int mem_cgroup_move_swap_account(swp_entry_t entry, - struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) + struct mem_cgroup *from, struct mem_cgroup *to) { return -EINVAL; } @@ -3363,7 +3317,7 @@ void mem_cgroup_end_migration(struct mem_cgroup *memcg, void mem_cgroup_replace_page_cache(struct page *oldpage, struct page *newpage) { - struct mem_cgroup *memcg; + struct mem_cgroup *memcg = NULL; struct page_cgroup *pc; enum charge_type type = MEM_CGROUP_CHARGE_TYPE_CACHE; @@ -3373,11 +3327,20 @@ void mem_cgroup_replace_page_cache(struct page *oldpage, pc = lookup_page_cgroup(oldpage); /* fix accounting on old pages */ lock_page_cgroup(pc); - memcg = pc->mem_cgroup; - mem_cgroup_charge_statistics(memcg, false, -1); - ClearPageCgroupUsed(pc); + if (PageCgroupUsed(pc)) { + memcg = pc->mem_cgroup; + mem_cgroup_charge_statistics(memcg, false, -1); + ClearPageCgroupUsed(pc); + } unlock_page_cgroup(pc); + /* + * When called from shmem_replace_page(), in some cases the + * oldpage has already been charged, and in some cases not. + */ + if (!memcg) + return; + if (PageSwapBacked(oldpage)) type = MEM_CGROUP_CHARGE_TYPE_SHMEM; @@ -3793,7 +3756,7 @@ try_to_free: goto move_account; } -int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event) +static int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event) { return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true); } @@ -3873,14 +3836,21 @@ static inline u64 mem_cgroup_usage(struct mem_cgroup *memcg, bool swap) return val << PAGE_SHIFT; } -static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft) +static ssize_t mem_cgroup_read(struct cgroup *cont, struct cftype *cft, + struct file *file, char __user *buf, + size_t nbytes, loff_t *ppos) { struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); + char str[64]; u64 val; - int type, name; + int type, name, len; type = MEMFILE_TYPE(cft->private); name = MEMFILE_ATTR(cft->private); + + if (!do_swap_account && type == _MEMSWAP) + return -EOPNOTSUPP; + switch (type) { case _MEM: if (name == RES_USAGE) @@ -3897,7 +3867,9 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft) default: BUG(); } - return val; + + len = scnprintf(str, sizeof(str), "%llu\n", (unsigned long long)val); + return simple_read_from_buffer(buf, nbytes, ppos, str, len); } /* * The user of this function is... @@ -3913,6 +3885,10 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft, type = MEMFILE_TYPE(cft->private); name = MEMFILE_ATTR(cft->private); + + if (!do_swap_account && type == _MEMSWAP) + return -EOPNOTSUPP; + switch (name) { case RES_LIMIT: if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */ @@ -3978,12 +3954,15 @@ out: static int mem_cgroup_reset(struct cgroup *cont, unsigned int event) { - struct mem_cgroup *memcg; + struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); int type, name; - memcg = mem_cgroup_from_cont(cont); type = MEMFILE_TYPE(event); name = MEMFILE_ATTR(event); + + if (!do_swap_account && type == _MEMSWAP) + return -EOPNOTSUPP; + switch (name) { case RES_MAX_USAGE: if (type == _MEM) @@ -4035,103 +4014,13 @@ static int mem_cgroup_move_charge_write(struct cgroup *cgrp, } #endif - -/* For read statistics */ -enum { - MCS_CACHE, - MCS_RSS, - MCS_FILE_MAPPED, - MCS_PGPGIN, - MCS_PGPGOUT, - MCS_SWAP, - MCS_PGFAULT, - MCS_PGMAJFAULT, - MCS_INACTIVE_ANON, - MCS_ACTIVE_ANON, - MCS_INACTIVE_FILE, - MCS_ACTIVE_FILE, - MCS_UNEVICTABLE, - NR_MCS_STAT, -}; - -struct mcs_total_stat { - s64 stat[NR_MCS_STAT]; -}; - -struct { - char *local_name; - char *total_name; -} memcg_stat_strings[NR_MCS_STAT] = { - {"cache", "total_cache"}, - {"rss", "total_rss"}, - {"mapped_file", "total_mapped_file"}, - {"pgpgin", "total_pgpgin"}, - {"pgpgout", "total_pgpgout"}, - {"swap", "total_swap"}, - {"pgfault", "total_pgfault"}, - {"pgmajfault", "total_pgmajfault"}, - {"inactive_anon", "total_inactive_anon"}, - {"active_anon", "total_active_anon"}, - {"inactive_file", "total_inactive_file"}, - {"active_file", "total_active_file"}, - {"unevictable", "total_unevictable"} -}; - - -static void -mem_cgroup_get_local_stat(struct mem_cgroup *memcg, struct mcs_total_stat *s) -{ - s64 val; - - /* per cpu stat */ - val = mem_cgroup_read_stat(memcg, MEM_CGROUP_STAT_CACHE); - s->stat[MCS_CACHE] += val * PAGE_SIZE; - val = mem_cgroup_read_stat(memcg, MEM_CGROUP_STAT_RSS); - s->stat[MCS_RSS] += val * PAGE_SIZE; - val = mem_cgroup_read_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED); - s->stat[MCS_FILE_MAPPED] += val * PAGE_SIZE; - val = mem_cgroup_read_events(memcg, MEM_CGROUP_EVENTS_PGPGIN); - s->stat[MCS_PGPGIN] += val; - val = mem_cgroup_read_events(memcg, MEM_CGROUP_EVENTS_PGPGOUT); - s->stat[MCS_PGPGOUT] += val; - if (do_swap_account) { - val = mem_cgroup_read_stat(memcg, MEM_CGROUP_STAT_SWAPOUT); - s->stat[MCS_SWAP] += val * PAGE_SIZE; - } - val = mem_cgroup_read_events(memcg, MEM_CGROUP_EVENTS_PGFAULT); - s->stat[MCS_PGFAULT] += val; - val = mem_cgroup_read_events(memcg, MEM_CGROUP_EVENTS_PGMAJFAULT); - s->stat[MCS_PGMAJFAULT] += val; - - /* per zone stat */ - val = mem_cgroup_nr_lru_pages(memcg, BIT(LRU_INACTIVE_ANON)); - s->stat[MCS_INACTIVE_ANON] += val * PAGE_SIZE; - val = mem_cgroup_nr_lru_pages(memcg, BIT(LRU_ACTIVE_ANON)); - s->stat[MCS_ACTIVE_ANON] += val * PAGE_SIZE; - val = mem_cgroup_nr_lru_pages(memcg, BIT(LRU_INACTIVE_FILE)); - s->stat[MCS_INACTIVE_FILE] += val * PAGE_SIZE; - val = mem_cgroup_nr_lru_pages(memcg, BIT(LRU_ACTIVE_FILE)); - s->stat[MCS_ACTIVE_FILE] += val * PAGE_SIZE; - val = mem_cgroup_nr_lru_pages(memcg, BIT(LRU_UNEVICTABLE)); - s->stat[MCS_UNEVICTABLE] += val * PAGE_SIZE; -} - -static void -mem_cgroup_get_total_stat(struct mem_cgroup *memcg, struct mcs_total_stat *s) -{ - struct mem_cgroup *iter; - - for_each_mem_cgroup_tree(iter, memcg) - mem_cgroup_get_local_stat(iter, s); -} - #ifdef CONFIG_NUMA -static int mem_control_numa_stat_show(struct seq_file *m, void *arg) +static int mem_control_numa_stat_show(struct cgroup *cont, struct cftype *cft, + struct seq_file *m) { int nid; unsigned long total_nr, file_nr, anon_nr, unevictable_nr; unsigned long node_nr; - struct cgroup *cont = m->private; struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); total_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL); @@ -4172,64 +4061,100 @@ static int mem_control_numa_stat_show(struct seq_file *m, void *arg) } #endif /* CONFIG_NUMA */ +static const char * const mem_cgroup_lru_names[] = { + "inactive_anon", + "active_anon", + "inactive_file", + "active_file", + "unevictable", +}; + +static inline void mem_cgroup_lru_names_not_uptodate(void) +{ + BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_lru_names) != NR_LRU_LISTS); +} + static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft, - struct cgroup_map_cb *cb) + struct seq_file *m) { struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); - struct mcs_total_stat mystat; - int i; - - memset(&mystat, 0, sizeof(mystat)); - mem_cgroup_get_local_stat(memcg, &mystat); - + struct mem_cgroup *mi; + unsigned int i; - for (i = 0; i < NR_MCS_STAT; i++) { - if (i == MCS_SWAP && !do_swap_account) + for (i = 0; i < MEM_CGROUP_STAT_NSTATS; i++) { + if (i == MEM_CGROUP_STAT_SWAPOUT && !do_swap_account) continue; - cb->fill(cb, memcg_stat_strings[i].local_name, mystat.stat[i]); + seq_printf(m, "%s %ld\n", mem_cgroup_stat_names[i], + mem_cgroup_read_stat(memcg, i) * PAGE_SIZE); } + for (i = 0; i < MEM_CGROUP_EVENTS_NSTATS; i++) + seq_printf(m, "%s %lu\n", mem_cgroup_events_names[i], + mem_cgroup_read_events(memcg, i)); + + for (i = 0; i < NR_LRU_LISTS; i++) + seq_printf(m, "%s %lu\n", mem_cgroup_lru_names[i], + mem_cgroup_nr_lru_pages(memcg, BIT(i)) * PAGE_SIZE); + /* Hierarchical information */ { unsigned long long limit, memsw_limit; memcg_get_hierarchical_limit(memcg, &limit, &memsw_limit); - cb->fill(cb, "hierarchical_memory_limit", limit); + seq_printf(m, "hierarchical_memory_limit %llu\n", limit); if (do_swap_account) - cb->fill(cb, "hierarchical_memsw_limit", memsw_limit); + seq_printf(m, "hierarchical_memsw_limit %llu\n", + memsw_limit); } - memset(&mystat, 0, sizeof(mystat)); - mem_cgroup_get_total_stat(memcg, &mystat); - for (i = 0; i < NR_MCS_STAT; i++) { - if (i == MCS_SWAP && !do_swap_account) + for (i = 0; i < MEM_CGROUP_STAT_NSTATS; i++) { + long long val = 0; + + if (i == MEM_CGROUP_STAT_SWAPOUT && !do_swap_account) continue; - cb->fill(cb, memcg_stat_strings[i].total_name, mystat.stat[i]); + for_each_mem_cgroup_tree(mi, memcg) + val += mem_cgroup_read_stat(mi, i) * PAGE_SIZE; + seq_printf(m, "total_%s %lld\n", mem_cgroup_stat_names[i], val); + } + + for (i = 0; i < MEM_CGROUP_EVENTS_NSTATS; i++) { + unsigned long long val = 0; + + for_each_mem_cgroup_tree(mi, memcg) + val += mem_cgroup_read_events(mi, i); + seq_printf(m, "total_%s %llu\n", + mem_cgroup_events_names[i], val); + } + + for (i = 0; i < NR_LRU_LISTS; i++) { + unsigned long long val = 0; + + for_each_mem_cgroup_tree(mi, memcg) + val += mem_cgroup_nr_lru_pages(mi, BIT(i)) * PAGE_SIZE; + seq_printf(m, "total_%s %llu\n", mem_cgroup_lru_names[i], val); } #ifdef CONFIG_DEBUG_VM { int nid, zid; struct mem_cgroup_per_zone *mz; + struct zone_reclaim_stat *rstat; unsigned long recent_rotated[2] = {0, 0}; unsigned long recent_scanned[2] = {0, 0}; for_each_online_node(nid) for (zid = 0; zid < MAX_NR_ZONES; zid++) { mz = mem_cgroup_zoneinfo(memcg, nid, zid); + rstat = &mz->lruvec.reclaim_stat; - recent_rotated[0] += - mz->reclaim_stat.recent_rotated[0]; - recent_rotated[1] += - mz->reclaim_stat.recent_rotated[1]; - recent_scanned[0] += - mz->reclaim_stat.recent_scanned[0]; - recent_scanned[1] += - mz->reclaim_stat.recent_scanned[1]; + recent_rotated[0] += rstat->recent_rotated[0]; + recent_rotated[1] += rstat->recent_rotated[1]; + recent_scanned[0] += rstat->recent_scanned[0]; + recent_scanned[1] += rstat->recent_scanned[1]; } - cb->fill(cb, "recent_rotated_anon", recent_rotated[0]); - cb->fill(cb, "recent_rotated_file", recent_rotated[1]); - cb->fill(cb, "recent_scanned_anon", recent_scanned[0]); - cb->fill(cb, "recent_scanned_file", recent_scanned[1]); + seq_printf(m, "recent_rotated_anon %lu\n", recent_rotated[0]); + seq_printf(m, "recent_rotated_file %lu\n", recent_rotated[1]); + seq_printf(m, "recent_scanned_anon %lu\n", recent_scanned[0]); + seq_printf(m, "recent_scanned_file %lu\n", recent_scanned[1]); } #endif @@ -4291,7 +4216,7 @@ static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap) usage = mem_cgroup_usage(memcg, swap); /* - * current_threshold points to threshold just below usage. + * current_threshold points to threshold just below or equal to usage. * If it's not true, a threshold was crossed after last * call of __mem_cgroup_threshold(). */ @@ -4417,14 +4342,15 @@ static int mem_cgroup_usage_register_event(struct cgroup *cgrp, /* Find current threshold */ new->current_threshold = -1; for (i = 0; i < size; i++) { - if (new->entries[i].threshold < usage) { + if (new->entries[i].threshold <= usage) { /* * new->current_threshold will not be used until * rcu_assign_pointer(), so it's safe to increment * it here. */ ++new->current_threshold; - } + } else + break; } /* Free old spare buffer and save old primary buffer as spare */ @@ -4493,7 +4419,7 @@ static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp, continue; new->entries[j] = thresholds->primary->entries[i]; - if (new->entries[j].threshold < usage) { + if (new->entries[j].threshold <= usage) { /* * new->current_threshold will not be used * until rcu_assign_pointer(), so it's safe to increment @@ -4507,6 +4433,12 @@ static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp, swap_buffers: /* Swap primary and spare array */ thresholds->spare = thresholds->primary; + /* If all events are unregistered, free the spare array */ + if (!new) { + kfree(thresholds->spare); + thresholds->spare = NULL; + } + rcu_assign_pointer(thresholds->primary, new); /* To be sure that nobody uses thresholds */ @@ -4601,46 +4533,23 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp, return 0; } -#ifdef CONFIG_NUMA -static const struct file_operations mem_control_numa_stat_file_operations = { - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static int mem_control_numa_stat_open(struct inode *unused, struct file *file) -{ - struct cgroup *cont = file->f_dentry->d_parent->d_fsdata; - - file->f_op = &mem_control_numa_stat_file_operations; - return single_open(file, mem_control_numa_stat_show, cont); -} -#endif /* CONFIG_NUMA */ - #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM -static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss) +static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss) { - /* - * Part of this would be better living in a separate allocation - * function, leaving us with just the cgroup tree population work. - * We, however, depend on state such as network's proto_list that - * is only initialized after cgroup creation. I found the less - * cumbersome way to deal with it to defer it all to populate time - */ - return mem_cgroup_sockets_init(cont, ss); + return mem_cgroup_sockets_init(memcg, ss); }; -static void kmem_cgroup_destroy(struct cgroup *cont) +static void kmem_cgroup_destroy(struct mem_cgroup *memcg) { - mem_cgroup_sockets_destroy(cont); + mem_cgroup_sockets_destroy(memcg); } #else -static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss) +static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss) { return 0; } -static void kmem_cgroup_destroy(struct cgroup *cont) +static void kmem_cgroup_destroy(struct mem_cgroup *memcg) { } #endif @@ -4649,7 +4558,7 @@ static struct cftype mem_cgroup_files[] = { { .name = "usage_in_bytes", .private = MEMFILE_PRIVATE(_MEM, RES_USAGE), - .read_u64 = mem_cgroup_read, + .read = mem_cgroup_read, .register_event = mem_cgroup_usage_register_event, .unregister_event = mem_cgroup_usage_unregister_event, }, @@ -4657,29 +4566,29 @@ static struct cftype mem_cgroup_files[] = { .name = "max_usage_in_bytes", .private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE), .trigger = mem_cgroup_reset, - .read_u64 = mem_cgroup_read, + .read = mem_cgroup_read, }, { .name = "limit_in_bytes", .private = MEMFILE_PRIVATE(_MEM, RES_LIMIT), .write_string = mem_cgroup_write, - .read_u64 = mem_cgroup_read, + .read = mem_cgroup_read, }, { .name = "soft_limit_in_bytes", .private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT), .write_string = mem_cgroup_write, - .read_u64 = mem_cgroup_read, + .read = mem_cgroup_read, }, { .name = "failcnt", .private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT), .trigger = mem_cgroup_reset, - .read_u64 = mem_cgroup_read, + .read = mem_cgroup_read, }, { .name = "stat", - .read_map = mem_control_stat_show, + .read_seq_string = mem_control_stat_show, }, { .name = "force_empty", @@ -4711,18 +4620,14 @@ static struct cftype mem_cgroup_files[] = { #ifdef CONFIG_NUMA { .name = "numa_stat", - .open = mem_control_numa_stat_open, - .mode = S_IRUGO, + .read_seq_string = mem_control_numa_stat_show, }, #endif -}; - #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP -static struct cftype memsw_cgroup_files[] = { { .name = "memsw.usage_in_bytes", .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE), - .read_u64 = mem_cgroup_read, + .read = mem_cgroup_read, .register_event = mem_cgroup_usage_register_event, .unregister_event = mem_cgroup_usage_unregister_event, }, @@ -4730,41 +4635,28 @@ static struct cftype memsw_cgroup_files[] = { .name = "memsw.max_usage_in_bytes", .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE), .trigger = mem_cgroup_reset, - .read_u64 = mem_cgroup_read, + .read = mem_cgroup_read, }, { .name = "memsw.limit_in_bytes", .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT), .write_string = mem_cgroup_write, - .read_u64 = mem_cgroup_read, + .read = mem_cgroup_read, }, { .name = "memsw.failcnt", .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT), .trigger = mem_cgroup_reset, - .read_u64 = mem_cgroup_read, + .read = mem_cgroup_read, }, -}; - -static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) -{ - if (!do_swap_account) - return 0; - return cgroup_add_files(cont, ss, memsw_cgroup_files, - ARRAY_SIZE(memsw_cgroup_files)); -}; -#else -static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) -{ - return 0; -} #endif + { }, /* terminate */ +}; static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node) { struct mem_cgroup_per_node *pn; struct mem_cgroup_per_zone *mz; - enum lru_list lru; int zone, tmp = node; /* * This routine is called against possible nodes. @@ -4782,8 +4674,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node) for (zone = 0; zone < MAX_NR_ZONES; zone++) { mz = &pn->zoneinfo[zone]; - for_each_lru(lru) - INIT_LIST_HEAD(&mz->lruvec.lists[lru]); + lruvec_init(&mz->lruvec, &NODE_DATA(node)->node_zones[zone]); mz->usage_in_excess = 0; mz->on_tree = false; mz->memcg = memcg; @@ -4826,23 +4717,40 @@ out_free: } /* - * Helpers for freeing a vzalloc()ed mem_cgroup by RCU, + * Helpers for freeing a kmalloc()ed/vzalloc()ed mem_cgroup by RCU, * but in process context. The work_freeing structure is overlaid * on the rcu_freeing structure, which itself is overlaid on memsw. */ -static void vfree_work(struct work_struct *work) +static void free_work(struct work_struct *work) { struct mem_cgroup *memcg; + int size = sizeof(struct mem_cgroup); memcg = container_of(work, struct mem_cgroup, work_freeing); - vfree(memcg); + /* + * We need to make sure that (at least for now), the jump label + * destruction code runs outside of the cgroup lock. This is because + * get_online_cpus(), which is called from the static_branch update, + * can't be called inside the cgroup_lock. cpusets are the ones + * enforcing this dependency, so if they ever change, we might as well. + * + * schedule_work() will guarantee this happens. Be careful if you need + * to move this code around, and make sure it is outside + * the cgroup_lock. + */ + disarm_sock_keys(memcg); + if (size < PAGE_SIZE) + kfree(memcg); + else + vfree(memcg); } -static void vfree_rcu(struct rcu_head *rcu_head) + +static void free_rcu(struct rcu_head *rcu_head) { struct mem_cgroup *memcg; memcg = container_of(rcu_head, struct mem_cgroup, rcu_freeing); - INIT_WORK(&memcg->work_freeing, vfree_work); + INIT_WORK(&memcg->work_freeing, free_work); schedule_work(&memcg->work_freeing); } @@ -4868,10 +4776,7 @@ static void __mem_cgroup_free(struct mem_cgroup *memcg) free_mem_cgroup_per_zone_info(memcg, node); free_percpu(memcg->stat); - if (sizeof(struct mem_cgroup) < PAGE_SIZE) - kfree_rcu(memcg, rcu_freeing); - else - call_rcu(&memcg->rcu_freeing, vfree_rcu); + call_rcu(&memcg->rcu_freeing, free_rcu); } static void mem_cgroup_get(struct mem_cgroup *memcg) @@ -5010,6 +4915,17 @@ mem_cgroup_create(struct cgroup *cont) memcg->move_charge_at_immigrate = 0; mutex_init(&memcg->thresholds_lock); spin_lock_init(&memcg->move_lock); + + error = memcg_init_kmem(memcg, &mem_cgroup_subsys); + if (error) { + /* + * We call put now because our (and parent's) refcnts + * are already in place. mem_cgroup_put() will internally + * call __mem_cgroup_free, so return directly + */ + mem_cgroup_put(memcg); + return ERR_PTR(error); + } return &memcg->css; free_out: __mem_cgroup_free(memcg); @@ -5027,28 +4943,11 @@ static void mem_cgroup_destroy(struct cgroup *cont) { struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); - kmem_cgroup_destroy(cont); + kmem_cgroup_destroy(memcg); mem_cgroup_put(memcg); } -static int mem_cgroup_populate(struct cgroup_subsys *ss, - struct cgroup *cont) -{ - int ret; - - ret = cgroup_add_files(cont, ss, mem_cgroup_files, - ARRAY_SIZE(mem_cgroup_files)); - - if (!ret) - ret = register_memsw_files(cont, ss); - - if (!ret) - ret = register_kmem_files(cont, ss); - - return ret; -} - #ifdef CONFIG_MMU /* Handlers for move charge at task migration. */ #define PRECHARGE_COUNT_AT_ONCE 256 @@ -5141,7 +5040,7 @@ static struct page *mc_handle_present_pte(struct vm_area_struct *vma, return NULL; if (PageAnon(page)) { /* we don't move shared anon */ - if (!move_anon() || page_mapcount(page) > 2) + if (!move_anon()) return NULL; } else if (!move_file()) /* we ignore mapcount for file pages */ @@ -5152,32 +5051,37 @@ static struct page *mc_handle_present_pte(struct vm_area_struct *vma, return page; } +#ifdef CONFIG_SWAP static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, unsigned long addr, pte_t ptent, swp_entry_t *entry) { - int usage_count; struct page *page = NULL; swp_entry_t ent = pte_to_swp_entry(ptent); if (!move_anon() || non_swap_entry(ent)) return NULL; - usage_count = mem_cgroup_count_swap_user(ent, &page); - if (usage_count > 1) { /* we don't move shared anon */ - if (page) - put_page(page); - return NULL; - } + /* + * Because lookup_swap_cache() updates some statistics counter, + * we call find_get_page() with swapper_space directly. + */ + page = find_get_page(&swapper_space, ent.val); if (do_swap_account) entry->val = ent.val; return page; } +#else +static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, + unsigned long addr, pte_t ptent, swp_entry_t *entry) +{ + return NULL; +} +#endif static struct page *mc_handle_file_pte(struct vm_area_struct *vma, unsigned long addr, pte_t ptent, swp_entry_t *entry) { struct page *page = NULL; - struct inode *inode; struct address_space *mapping; pgoff_t pgoff; @@ -5186,7 +5090,6 @@ static struct page *mc_handle_file_pte(struct vm_area_struct *vma, if (!move_file()) return NULL; - inode = vma->vm_file->f_path.dentry->d_inode; mapping = vma->vm_file->f_mapping; if (pte_none(ptent)) pgoff = linear_page_index(vma, addr); @@ -5475,7 +5378,7 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, * part of thp split is not executed yet. */ if (pmd_trans_huge_lock(pmd, vma) == 1) { - if (!mc.precharge) { + if (mc.precharge < HPAGE_PMD_NR) { spin_unlock(&vma->vm_mm->page_table_lock); return 0; } @@ -5485,8 +5388,7 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, if (!isolate_lru_page(page)) { pc = lookup_page_cgroup(page); if (!mem_cgroup_move_account(page, HPAGE_PMD_NR, - pc, mc.from, mc.to, - false)) { + pc, mc.from, mc.to)) { mc.precharge -= HPAGE_PMD_NR; mc.moved_charge += HPAGE_PMD_NR; } @@ -5516,7 +5418,7 @@ retry: goto put; pc = lookup_page_cgroup(page); if (!mem_cgroup_move_account(page, 1, pc, - mc.from, mc.to, false)) { + mc.from, mc.to)) { mc.precharge--; /* we uncharge from mc.from later. */ mc.moved_charge++; @@ -5527,8 +5429,7 @@ put: /* get_mctgt_type() gets the page */ break; case MC_TARGET_SWAP: ent = target.ent; - if (!mem_cgroup_move_swap_account(ent, - mc.from, mc.to, false)) { + if (!mem_cgroup_move_swap_account(ent, mc.from, mc.to)) { mc.precharge--; /* we fixup refcnts and charges later. */ mc.moved_swap++; @@ -5604,7 +5505,6 @@ static void mem_cgroup_move_task(struct cgroup *cont, if (mm) { if (mc.to) mem_cgroup_move_charge(mm); - put_swap_token(mm); mmput(mm); } if (mc.to) @@ -5632,12 +5532,13 @@ struct cgroup_subsys mem_cgroup_subsys = { .create = mem_cgroup_create, .pre_destroy = mem_cgroup_pre_destroy, .destroy = mem_cgroup_destroy, - .populate = mem_cgroup_populate, .can_attach = mem_cgroup_can_attach, .cancel_attach = mem_cgroup_cancel_attach, .attach = mem_cgroup_move_task, + .base_cftypes = mem_cgroup_files, .early_init = 0, .use_id = 1, + .__DEPRECATED_clear_css_refs = true, }; #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |