From d9d834314371a9dd89b93bf010f19e32ee0691cc Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Tue, 14 May 2019 15:47:12 -0700 Subject: [PATCH 2295/2944] mm: memcontrol: fix recursive statistics correctness & scalabilty task #30476331 commit 42a300353577ccc17ecc627b8570a89fa1678bec upstream Right now, when somebody needs to know the recursive memory statistics and events of a cgroup subtree, they need to walk the entire subtree and sum up the counters manually. There are two issues with this: 1. When a cgroup gets deleted, its stats are lost. The state counters should all be 0 at that point, of course, but the events are not. When this happens, the event counters, which are supposed to be monotonic, can go backwards in the parent cgroups. 2. During regular operation, we always have a certain number of lazily freed cgroups sitting around that have been deleted, have no tasks, but have a few cache pages remaining. These groups' statistics do not change until we eventually hit memory pressure, but somebody watching, say, memory.stat on an ancestor has to iterate those every time. This patch addresses both issues by introducing recursive counters at each level that are propagated from the write side when stats change. Upward propagation happens when the per-cpu caches spill over into the local atomic counter. This is the same thing we do during charge and uncharge, except that the latter uses atomic RMWs, which are more expensive; stat changes happen at around the same rate. In a sparse file test (page faults and reclaim at maximum CPU speed) with 5 cgroup nesting levels, perf shows __mod_memcg_page state at ~1%. Meanwhile, lruvec_page_state_local should also use lruvec_stat_local accordingly in coldpgs.c. Link: http://lkml.kernel.org/r/20190412151507.2769-4-hannes@cmpxchg.org Signed-off-by: Johannes Weiner Reviewed-by: Shakeel Butt Reviewed-by: Roman Gushchin Cc: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: zhongjiang-ali Reviewed-by: Xunlei Pang --- include/linux/memcontrol.h | 54 ++++++++++++- mm/memcontrol.c | 196 ++++++++++++++++++++++----------------------- 2 files changed, 145 insertions(+), 105 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index a43743e..2942d22 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -173,6 +173,7 @@ struct mem_cgroup_per_node { struct lruvec_stat __percpu *lruvec_stat_cpu; atomic_long_t lruvec_stat[NR_VM_NODE_STAT_ITEMS]; + atomic_long_t lruvec_stat_local[NR_VM_NODE_STAT_ITEMS]; unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS]; @@ -333,8 +334,12 @@ struct mem_cgroup { MEMCG_PADDING(_pad2_); atomic_long_t vmstats[MEMCG_NR_STAT]; + atomic_long_t vmstats_local[MEMCG_NR_STAT]; + atomic_long_t vmevents[NR_VM_EVENT_ITEMS]; - atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS]; + atomic_long_t vmevents_local[NR_VM_EVENT_ITEMS]; + + atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS]; atomic_long_t memory_events_local[MEMCG_NR_MEMORY_EVENTS]; unsigned long socket_pressure; @@ -647,10 +652,24 @@ struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim, * idx can be of type enum memcg_stat_item or node_stat_item. * Keep in sync with memcg_exact_page_state(). */ +static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx) +{ + long x = atomic_long_read(&memcg->vmstats[idx]); +#ifdef CONFIG_SMP + if (x < 0) + x = 0; +#endif + return x; +} + +/* + * idx can be of type enum memcg_stat_item or node_stat_item. + * Keep in sync with memcg_exact_page_state(). + */ static inline unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx) { - long x = atomic_long_read(&memcg->vmstats[idx]); + long x = atomic_long_read(&memcg->vmstats_local[idx]); #ifdef CONFIG_SMP if (x < 0) x = 0; @@ -702,6 +721,24 @@ static inline void mod_memcg_page_state(struct page *page, mod_memcg_state(page->mem_cgroup, idx, val); } +static inline unsigned long lruvec_page_state(struct lruvec *lruvec, + enum node_stat_item idx) +{ + struct mem_cgroup_per_node *pn; + long x; + + if (mem_cgroup_disabled()) + return node_page_state(lruvec_pgdat(lruvec), idx); + + pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); + x = atomic_long_read(&pn->lruvec_stat[idx]); +#ifdef CONFIG_SMP + if (x < 0) + x = 0; +#endif + return x; +} + static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, enum node_stat_item idx) { @@ -712,7 +749,7 @@ static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, return node_page_state(lruvec_pgdat(lruvec), idx); pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); - x = atomic_long_read(&pn->lruvec_stat[idx]); + x = atomic_long_read(&pn->lruvec_stat_local[idx]); #ifdef CONFIG_SMP if (x < 0) x = 0; @@ -1102,6 +1139,11 @@ static inline void mem_cgroup_print_oom_group(struct mem_cgroup *memcg) { } +static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx) +{ + return 0; +} + static inline unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx) { @@ -1132,6 +1174,12 @@ static inline void mod_memcg_page_state(struct page *page, { } +static inline unsigned long lruvec_page_state(struct lruvec *lruvec, + enum node_stat_item idx) +{ + return node_page_state(lruvec_pgdat(lruvec), idx); +} + static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, enum node_stat_item idx) { diff --git a/mm/memcontrol.c b/mm/memcontrol.c index bf72c91..9a2bc3e 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -714,12 +714,27 @@ void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val) x = val + __this_cpu_read(memcg->vmstats_percpu->stat[idx]); if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) { - atomic_long_add(x, &memcg->vmstats[idx]); + struct mem_cgroup *mi; + + atomic_long_add(x, &memcg->vmstats_local[idx]); + for (mi = memcg; mi; mi = parent_mem_cgroup(mi)) + atomic_long_add(x, &mi->vmstats[idx]); x = 0; } __this_cpu_write(memcg->vmstats_percpu->stat[idx], x); } +static struct mem_cgroup_per_node * +parent_nodeinfo(struct mem_cgroup_per_node *pn, int nid) +{ + struct mem_cgroup *parent; + + parent = parent_mem_cgroup(pn->memcg); + if (!parent) + return NULL; + return mem_cgroup_nodeinfo(parent, nid); +} + /** * __mod_lruvec_state - update lruvec memory statistics * @lruvec: the lruvec @@ -733,24 +748,31 @@ void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val) void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx, int val) { + pg_data_t *pgdat = lruvec_pgdat(lruvec); struct mem_cgroup_per_node *pn; + struct mem_cgroup *memcg; long x; /* Update node */ - __mod_node_page_state(lruvec_pgdat(lruvec), idx, val); + __mod_node_page_state(pgdat, idx, val); if (mem_cgroup_disabled()) return; pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec); + memcg = pn->memcg; /* Update memcg */ - __mod_memcg_state(pn->memcg, idx, val); + __mod_memcg_state(memcg, idx, val); /* Update lruvec */ x = val + __this_cpu_read(pn->lruvec_stat_cpu->count[idx]); if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) { - atomic_long_add(x, &pn->lruvec_stat[idx]); + struct mem_cgroup_per_node *pi; + + atomic_long_add(x, &pn->lruvec_stat_local[idx]); + for (pi = pn; pi; pi = parent_nodeinfo(pi, pgdat->node_id)) + atomic_long_add(x, &pi->lruvec_stat[idx]); x = 0; } __this_cpu_write(pn->lruvec_stat_cpu->count[idx], x); @@ -772,18 +794,26 @@ void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx, x = count + __this_cpu_read(memcg->vmstats_percpu->events[idx]); if (unlikely(x > MEMCG_CHARGE_BATCH)) { - atomic_long_add(x, &memcg->vmevents[idx]); + struct mem_cgroup *mi; + + atomic_long_add(x, &memcg->vmevents_local[idx]); + for (mi = memcg; mi; mi = parent_mem_cgroup(mi)) + atomic_long_add(x, &mi->vmevents[idx]); x = 0; } __this_cpu_write(memcg->vmstats_percpu->events[idx], x); } -static unsigned long memcg_events_local(struct mem_cgroup *memcg, - int event) +static unsigned long memcg_events(struct mem_cgroup *memcg, int event) { return atomic_long_read(&memcg->vmevents[event]); } +static unsigned long memcg_events_local(struct mem_cgroup *memcg, int event) +{ + return atomic_long_read(&memcg->vmevents_local[event]); +} + static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg, struct page *page, bool compound, int nr_pages) @@ -2353,7 +2383,7 @@ void drain_all_stock(struct mem_cgroup *root_memcg) static int memcg_hotplug_cpu_dead(unsigned int cpu) { struct memcg_stock_pcp *stock; - struct mem_cgroup *memcg; + struct mem_cgroup *memcg, *mi; stock = &per_cpu(memcg_stock, cpu); drain_stock(stock); @@ -2366,8 +2396,11 @@ static int memcg_hotplug_cpu_dead(unsigned int cpu) long x; x = this_cpu_xchg(memcg->vmstats_percpu->stat[i], 0); - if (x) - atomic_long_add(x, &memcg->vmstats[i]); + if (x) { + atomic_long_add(x, &memcg->vmstats_local[i]); + for (mi = memcg; mi; mi = parent_mem_cgroup(mi)) + atomic_long_add(x, &memcg->vmstats[i]); + } if (i >= NR_VM_NODE_STAT_ITEMS) continue; @@ -2377,8 +2410,12 @@ static int memcg_hotplug_cpu_dead(unsigned int cpu) pn = mem_cgroup_nodeinfo(memcg, nid); x = this_cpu_xchg(pn->lruvec_stat_cpu->count[i], 0); - if (x) - atomic_long_add(x, &pn->lruvec_stat[i]); + if (x) { + atomic_long_add(x, &pn->lruvec_stat_local[i]); + do { + atomic_long_add(x, &pn->lruvec_stat[i]); + } while ((pn = parent_nodeinfo(pn, nid))); + } } } @@ -2386,8 +2423,11 @@ static int memcg_hotplug_cpu_dead(unsigned int cpu) long x; x = this_cpu_xchg(memcg->vmstats_percpu->events[i], 0); - if (x) - atomic_long_add(x, &memcg->vmevents[i]); + if (x) { + atomic_long_add(x, &memcg->vmevents_local[i]); + for (mi = memcg; mi; mi = parent_mem_cgroup(mi)) + atomic_long_add(x, &memcg->vmevents[i]); + } } } @@ -3605,54 +3645,15 @@ static int mem_cgroup_priority_oom_write(struct cgroup_subsys_state *css, return 0; } -struct accumulated_vmstats { - unsigned long vmstats[MEMCG_NR_STAT]; - unsigned long vmevents[NR_VM_EVENT_ITEMS]; - unsigned long lru_pages[NR_LRU_LISTS]; - - /* overrides for v1 */ - const unsigned int *vmstats_array; - const unsigned int *vmevents_array; - - int vmstats_size; - int vmevents_size; -}; - -static void accumulate_vmstats(struct mem_cgroup *memcg, - struct accumulated_vmstats *acc) -{ - struct mem_cgroup *mi; - int i; - - for_each_mem_cgroup_tree(mi, memcg) { - for (i = 0; i < acc->vmstats_size; i++) - acc->vmstats[i] += memcg_page_state_local(mi, - acc->vmstats_array ? acc->vmstats_array[i] : i); - - for (i = 0; i < acc->vmevents_size; i++) - acc->vmevents[i] += memcg_events_local(mi, - acc->vmevents_array - ? acc->vmevents_array[i] : i); - - for (i = 0; i < NR_LRU_LISTS; i++) - acc->lru_pages[i] += memcg_page_state_local(mi, - NR_LRU_BASE + i); - } -} - static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap) { - unsigned long val = 0; + unsigned long val; if (mem_cgroup_is_root(memcg)) { - struct mem_cgroup *iter; - - for_each_mem_cgroup_tree(iter, memcg) { - val += memcg_page_state_local(iter, MEMCG_CACHE); - val += memcg_page_state_local(iter, MEMCG_RSS); - if (swap) - val += memcg_page_state_local(iter, MEMCG_SWAP); - } + val = memcg_page_state(memcg, MEMCG_CACHE) + + memcg_page_state(memcg, MEMCG_RSS); + if (swap) + val += memcg_page_state(memcg, MEMCG_SWAP); } else { if (!swap) val = page_counter_read(&memcg->memory); @@ -4337,7 +4338,6 @@ static int memcg_stat_show(struct seq_file *m, void *v) unsigned long memory, memsw; struct mem_cgroup *mi; unsigned int i; - struct accumulated_vmstats acc; BUILD_BUG_ON(ARRAY_SIZE(memcg1_stat_names) != ARRAY_SIZE(memcg1_stats)); BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_lru_names) != NR_LRU_LISTS); @@ -4371,27 +4371,21 @@ static int memcg_stat_show(struct seq_file *m, void *v) seq_printf(m, "hierarchical_memsw_limit %llu\n", (u64)memsw * PAGE_SIZE); - memset(&acc, 0, sizeof(acc)); - acc.vmstats_size = ARRAY_SIZE(memcg1_stats); - acc.vmstats_array = memcg1_stats; - acc.vmevents_size = ARRAY_SIZE(memcg1_events); - acc.vmevents_array = memcg1_events; - accumulate_vmstats(memcg, &acc); - for (i = 0; i < ARRAY_SIZE(memcg1_stats); i++) { if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account()) continue; seq_printf(m, "total_%s %llu\n", memcg1_stat_names[i], - (u64)acc.vmstats[i] * PAGE_SIZE); + (u64)memcg_page_state(memcg, i) * PAGE_SIZE); } for (i = 0; i < ARRAY_SIZE(memcg1_events); i++) seq_printf(m, "total_%s %llu\n", memcg1_event_names[i], - (u64)acc.vmevents[i]); + (u64)memcg_events(memcg, i)); for (i = 0; i < NR_LRU_LISTS; i++) seq_printf(m, "total_%s %llu\n", mem_cgroup_lru_names[i], - (u64)acc.lru_pages[i] * PAGE_SIZE); + (u64)memcg_page_state(memcg, NR_LRU_BASE + i) * + PAGE_SIZE); #ifdef CONFIG_DEBUG_VM { @@ -7189,7 +7183,6 @@ static ssize_t memory_max_write(struct kernfs_open_file *of, static int memory_stat_show(struct seq_file *m, void *v) { struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); - struct accumulated_vmstats acc; int i; /* @@ -7203,62 +7196,61 @@ static int memory_stat_show(struct seq_file *m, void *v) * Current memory state: */ - memset(&acc, 0, sizeof(acc)); - acc.vmstats_size = MEMCG_NR_STAT; - acc.vmevents_size = NR_VM_EVENT_ITEMS; - accumulate_vmstats(memcg, &acc); - seq_printf(m, "anon %llu\n", - (u64)acc.vmstats[MEMCG_RSS] * PAGE_SIZE); + (u64)memcg_page_state(memcg, MEMCG_RSS) * PAGE_SIZE); seq_printf(m, "file %llu\n", - (u64)acc.vmstats[MEMCG_CACHE] * PAGE_SIZE); + (u64)memcg_page_state(memcg, MEMCG_CACHE) * PAGE_SIZE); seq_printf(m, "kernel_stack %llu\n", - (u64)acc.vmstats[MEMCG_KERNEL_STACK_KB] * 1024); + (u64)memcg_page_state(memcg, MEMCG_KERNEL_STACK_KB) * 1024); seq_printf(m, "slab %llu\n", - (u64)(acc.vmstats[NR_SLAB_RECLAIMABLE] + - acc.vmstats[NR_SLAB_UNRECLAIMABLE]) * PAGE_SIZE); + (u64)(memcg_page_state(memcg, NR_SLAB_RECLAIMABLE) + + memcg_page_state(memcg, NR_SLAB_UNRECLAIMABLE)) * + PAGE_SIZE); seq_printf(m, "sock %llu\n", - (u64)acc.vmstats[MEMCG_SOCK] * PAGE_SIZE); + (u64)memcg_page_state(memcg, MEMCG_SOCK) * PAGE_SIZE); seq_printf(m, "shmem %llu\n", - (u64)acc.vmstats[NR_SHMEM] * PAGE_SIZE); + (u64)memcg_page_state(memcg, NR_SHMEM) * PAGE_SIZE); seq_printf(m, "file_mapped %llu\n", - (u64)acc.vmstats[NR_FILE_MAPPED] * PAGE_SIZE); + (u64)memcg_page_state(memcg, NR_FILE_MAPPED) * PAGE_SIZE); seq_printf(m, "file_dirty %llu\n", - (u64)acc.vmstats[NR_FILE_DIRTY] * PAGE_SIZE); + (u64)memcg_page_state(memcg, NR_FILE_DIRTY) * PAGE_SIZE); seq_printf(m, "file_writeback %llu\n", - (u64)acc.vmstats[NR_WRITEBACK] * PAGE_SIZE); + (u64)memcg_page_state(memcg, NR_WRITEBACK) * PAGE_SIZE); for (i = 0; i < NR_LRU_LISTS; i++) seq_printf(m, "%s %llu\n", mem_cgroup_lru_names[i], - (u64)acc.lru_pages[i] * PAGE_SIZE); + (u64)memcg_page_state(memcg, NR_LRU_BASE + i) * + PAGE_SIZE); seq_printf(m, "slab_reclaimable %llu\n", - (u64)acc.vmstats[NR_SLAB_RECLAIMABLE] * PAGE_SIZE); + (u64)memcg_page_state(memcg, NR_SLAB_RECLAIMABLE) * + PAGE_SIZE); seq_printf(m, "slab_unreclaimable %llu\n", - (u64)acc.vmstats[NR_SLAB_UNRECLAIMABLE] * PAGE_SIZE); + (u64)memcg_page_state(memcg, NR_SLAB_UNRECLAIMABLE) * + PAGE_SIZE); /* Accumulated memory events */ - seq_printf(m, "pgfault %lu\n", acc.vmevents[PGFAULT]); - seq_printf(m, "pgmajfault %lu\n", acc.vmevents[PGMAJFAULT]); + seq_printf(m, "pgfault %lu\n", memcg_events(memcg, PGFAULT)); + seq_printf(m, "pgmajfault %lu\n", memcg_events(memcg, PGMAJFAULT)); - seq_printf(m, "pgrefill %lu\n", acc.vmevents[PGREFILL]); - seq_printf(m, "pgscan %lu\n", acc.vmevents[PGSCAN_KSWAPD] + - acc.vmevents[PGSCAN_DIRECT]); - seq_printf(m, "pgsteal %lu\n", acc.vmevents[PGSTEAL_KSWAPD] + - acc.vmevents[PGSTEAL_DIRECT]); - seq_printf(m, "pgactivate %lu\n", acc.vmevents[PGACTIVATE]); - seq_printf(m, "pgdeactivate %lu\n", acc.vmevents[PGDEACTIVATE]); - seq_printf(m, "pglazyfree %lu\n", acc.vmevents[PGLAZYFREE]); - seq_printf(m, "pglazyfreed %lu\n", acc.vmevents[PGLAZYFREED]); + seq_printf(m, "pgrefill %lu\n", memcg_events(memcg, PGREFILL)); + seq_printf(m, "pgscan %lu\n", memcg_events(memcg, PGSCAN_KSWAPD) + + memcg_events(memcg, PGSCAN_DIRECT)); + seq_printf(m, "pgsteal %lu\n", memcg_events(memcg, PGSTEAL_KSWAPD) + + memcg_events(memcg, PGSTEAL_DIRECT)); + seq_printf(m, "pgactivate %lu\n", memcg_events(memcg, PGACTIVATE)); + seq_printf(m, "pgdeactivate %lu\n", memcg_events(memcg, PGDEACTIVATE)); + seq_printf(m, "pglazyfree %lu\n", memcg_events(memcg, PGLAZYFREE)); + seq_printf(m, "pglazyfreed %lu\n", memcg_events(memcg, PGLAZYFREED)); seq_printf(m, "workingset_refault %lu\n", - acc.vmstats[WORKINGSET_REFAULT]); + memcg_page_state(memcg, WORKINGSET_REFAULT)); seq_printf(m, "workingset_activate %lu\n", - acc.vmstats[WORKINGSET_ACTIVATE]); + memcg_page_state(memcg, WORKINGSET_ACTIVATE)); seq_printf(m, "workingset_nodereclaim %lu\n", - acc.vmstats[WORKINGSET_NODERECLAIM]); + memcg_page_state(memcg, WORKINGSET_NODERECLAIM)); return 0; } -- 1.8.3.1