memcg: switch lruvec stats to rstat
The commit2d146aa3aa("mm: memcontrol: switch to rstat") switched memcg stats to rstat infrastructure but skipped the conversion of the lruvec stats as such stats are read in the performance critical code paths and flushing stats may have impacted the performances of the applications. This patch converts the lruvec stats to rstat and later patches add mechanisms to keep the performance impact to minimum. The rstat conversion comes with the price i.e. memory cost. Effectively this patch reverts the savings done by the commitf3344adf38("mm: memcontrol: optimize per-lruvec stats counter memory usage"). However this cost is justified due to negative impact of the inaccurate lruvec stats on many heuristics. One such case is reported in [1]. The memory reclaim code is filled with plethora of heuristics and many of those heuristics reads the lruvec stats. So, inaccurate stats can make such heuristics ineffective. [1] reports the impact of inaccurate lruvec stats on the "cache trim mode" heuristic. Inaccurate lruvec stats can impact the deactivation and aging anon heuristics as well. [1] https://lore.kernel.org/linux-mm/20210311004449.1170308-1-ying.huang@intel.com/ Link: https://lkml.kernel.org/r/20210716212137.1391164-1-shakeelb@google.com Link: https://lkml.kernel.org/r/20210714013948.270662-1-shakeelb@google.com Signed-off-by: Shakeel Butt <shakeelb@google.com> Cc: Tejun Heo <tj@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Hillf Danton <hdanton@sina.com> Cc: Michal Koutný <mkoutny@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Shakeel Butt
Linus Torvalds
Родитель
fab827dbee
Коммит
7e1c0d6f58
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@ -105,14 +105,6 @@ struct mem_cgroup_reclaim_iter {
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unsigned int generation;
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};
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struct lruvec_stat {
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long count[NR_VM_NODE_STAT_ITEMS];
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};
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struct batched_lruvec_stat {
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s32 count[NR_VM_NODE_STAT_ITEMS];
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};
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/*
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* Bitmap and deferred work of shrinker::id corresponding to memcg-aware
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* shrinkers, which have elements charged to this memcg.
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@ -123,24 +115,30 @@ struct shrinker_info {
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unsigned long *map;
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};
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struct lruvec_stats_percpu {
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/* Local (CPU and cgroup) state */
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long state[NR_VM_NODE_STAT_ITEMS];
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/* Delta calculation for lockless upward propagation */
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long state_prev[NR_VM_NODE_STAT_ITEMS];
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};
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struct lruvec_stats {
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/* Aggregated (CPU and subtree) state */
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long state[NR_VM_NODE_STAT_ITEMS];
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/* Pending child counts during tree propagation */
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long state_pending[NR_VM_NODE_STAT_ITEMS];
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};
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/*
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* per-node information in memory controller.
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*/
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struct mem_cgroup_per_node {
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struct lruvec lruvec;
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/*
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* Legacy local VM stats. This should be struct lruvec_stat and
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* cannot be optimized to struct batched_lruvec_stat. Because
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* the threshold of the lruvec_stat_cpu can be as big as
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* MEMCG_CHARGE_BATCH * PAGE_SIZE. It can fit into s32. But this
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* filed has no upper limit.
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*/
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struct lruvec_stat __percpu *lruvec_stat_local;
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/* Subtree VM stats (batched updates) */
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struct batched_lruvec_stat __percpu *lruvec_stat_cpu;
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atomic_long_t lruvec_stat[NR_VM_NODE_STAT_ITEMS];
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struct lruvec_stats_percpu __percpu *lruvec_stats_percpu;
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struct lruvec_stats lruvec_stats;
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unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];
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@ -997,7 +995,7 @@ static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
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return node_page_state(lruvec_pgdat(lruvec), idx);
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pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
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x = atomic_long_read(&pn->lruvec_stat[idx]);
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x = READ_ONCE(pn->lruvec_stats.state[idx]);
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#ifdef CONFIG_SMP
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if (x < 0)
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x = 0;
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@ -1017,7 +1015,7 @@ static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec,
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pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
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for_each_possible_cpu(cpu)
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x += per_cpu(pn->lruvec_stat_local->count[idx], cpu);
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x += per_cpu(pn->lruvec_stats_percpu->state[idx], cpu);
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#ifdef CONFIG_SMP
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if (x < 0)
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x = 0;
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112
mm/memcontrol.c
112
mm/memcontrol.c
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@ -660,23 +660,11 @@ static unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx)
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return x;
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}
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static struct mem_cgroup_per_node *
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parent_nodeinfo(struct mem_cgroup_per_node *pn, int nid)
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{
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struct mem_cgroup *parent;
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parent = parent_mem_cgroup(pn->memcg);
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if (!parent)
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return NULL;
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return parent->nodeinfo[nid];
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}
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void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
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int val)
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{
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struct mem_cgroup_per_node *pn;
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struct mem_cgroup *memcg;
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long x, threshold = MEMCG_CHARGE_BATCH;
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pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
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memcg = pn->memcg;
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@ -685,21 +673,7 @@ void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
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__mod_memcg_state(memcg, idx, val);
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/* Update lruvec */
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__this_cpu_add(pn->lruvec_stat_local->count[idx], val);
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if (vmstat_item_in_bytes(idx))
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threshold <<= PAGE_SHIFT;
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x = val + __this_cpu_read(pn->lruvec_stat_cpu->count[idx]);
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if (unlikely(abs(x) > threshold)) {
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pg_data_t *pgdat = lruvec_pgdat(lruvec);
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struct mem_cgroup_per_node *pi;
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for (pi = pn; pi; pi = parent_nodeinfo(pi, pgdat->node_id))
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atomic_long_add(x, &pi->lruvec_stat[idx]);
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x = 0;
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}
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__this_cpu_write(pn->lruvec_stat_cpu->count[idx], x);
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__this_cpu_add(pn->lruvec_stats_percpu->state[idx], val);
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}
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/**
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@ -2278,40 +2252,13 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)
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mutex_unlock(&percpu_charge_mutex);
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}
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static void memcg_flush_lruvec_page_state(struct mem_cgroup *memcg, int cpu)
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{
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int nid;
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for_each_node(nid) {
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struct mem_cgroup_per_node *pn = memcg->nodeinfo[nid];
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unsigned long stat[NR_VM_NODE_STAT_ITEMS];
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struct batched_lruvec_stat *lstatc;
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int i;
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lstatc = per_cpu_ptr(pn->lruvec_stat_cpu, cpu);
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for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
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stat[i] = lstatc->count[i];
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lstatc->count[i] = 0;
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}
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do {
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for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
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atomic_long_add(stat[i], &pn->lruvec_stat[i]);
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} while ((pn = parent_nodeinfo(pn, nid)));
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}
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}
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static int memcg_hotplug_cpu_dead(unsigned int cpu)
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{
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struct memcg_stock_pcp *stock;
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struct mem_cgroup *memcg;
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stock = &per_cpu(memcg_stock, cpu);
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drain_stock(stock);
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for_each_mem_cgroup(memcg)
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memcg_flush_lruvec_page_state(memcg, cpu);
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return 0;
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}
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@ -5118,17 +5065,9 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
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if (!pn)
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return 1;
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pn->lruvec_stat_local = alloc_percpu_gfp(struct lruvec_stat,
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pn->lruvec_stats_percpu = alloc_percpu_gfp(struct lruvec_stats_percpu,
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GFP_KERNEL_ACCOUNT);
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if (!pn->lruvec_stat_local) {
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kfree(pn);
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return 1;
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}
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pn->lruvec_stat_cpu = alloc_percpu_gfp(struct batched_lruvec_stat,
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GFP_KERNEL_ACCOUNT);
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if (!pn->lruvec_stat_cpu) {
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free_percpu(pn->lruvec_stat_local);
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if (!pn->lruvec_stats_percpu) {
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kfree(pn);
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return 1;
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}
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@ -5149,8 +5088,7 @@ static void free_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
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if (!pn)
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return;
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free_percpu(pn->lruvec_stat_cpu);
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free_percpu(pn->lruvec_stat_local);
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free_percpu(pn->lruvec_stats_percpu);
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kfree(pn);
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}
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@ -5166,15 +5104,7 @@ static void __mem_cgroup_free(struct mem_cgroup *memcg)
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static void mem_cgroup_free(struct mem_cgroup *memcg)
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{
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int cpu;
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memcg_wb_domain_exit(memcg);
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/*
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* Flush percpu lruvec stats to guarantee the value
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* correctness on parent's and all ancestor levels.
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*/
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for_each_online_cpu(cpu)
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memcg_flush_lruvec_page_state(memcg, cpu);
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__mem_cgroup_free(memcg);
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}
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@ -5407,7 +5337,7 @@ static void mem_cgroup_css_rstat_flush(struct cgroup_subsys_state *css, int cpu)
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struct mem_cgroup *parent = parent_mem_cgroup(memcg);
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struct memcg_vmstats_percpu *statc;
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long delta, v;
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int i;
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int i, nid;
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statc = per_cpu_ptr(memcg->vmstats_percpu, cpu);
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@ -5455,6 +5385,36 @@ static void mem_cgroup_css_rstat_flush(struct cgroup_subsys_state *css, int cpu)
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if (parent)
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parent->vmstats.events_pending[i] += delta;
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}
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for_each_node_state(nid, N_MEMORY) {
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struct mem_cgroup_per_node *pn = memcg->nodeinfo[nid];
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struct mem_cgroup_per_node *ppn = NULL;
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struct lruvec_stats_percpu *lstatc;
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if (parent)
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ppn = parent->nodeinfo[nid];
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lstatc = per_cpu_ptr(pn->lruvec_stats_percpu, cpu);
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for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
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delta = pn->lruvec_stats.state_pending[i];
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if (delta)
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pn->lruvec_stats.state_pending[i] = 0;
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v = READ_ONCE(lstatc->state[i]);
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if (v != lstatc->state_prev[i]) {
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delta += v - lstatc->state_prev[i];
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lstatc->state_prev[i] = v;
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}
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if (!delta)
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continue;
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pn->lruvec_stats.state[i] += delta;
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if (ppn)
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ppn->lruvec_stats.state_pending[i] += delta;
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}
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}
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}
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#ifdef CONFIG_MMU
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@ -6388,6 +6348,8 @@ static int memory_numa_stat_show(struct seq_file *m, void *v)
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int i;
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struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
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cgroup_rstat_flush(memcg->css.cgroup);
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for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
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int nid;
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