The patch titled
Subject: memcg: infrastructure to flush memcg stats
has been added to the -mm tree. Its filename is
memcg-infrastructure-to-flush-memcg-stats.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/memcg-infrastructure-to-flush-memcg-stats.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/memcg-infrastructure-to-flush-memcg-stats.patch
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------------------------------------------------------
From: Shakeel Butt <shakeelb@xxxxxxxxxx>
Subject: memcg: infrastructure to flush memcg stats
At the moment memcg stats are read in four contexts:
1. memcg stat user interfaces
2. dirty throttling
3. page fault
4. memory reclaim
Currently the kernel flushes the stats for first two cases. Flushing the
stats for remaining two casese may have performance impact. Always
flushing the memcg stats on the page fault code path may negatively
impacts the performance of the applications. In addition flushing in the
memory reclaim code path, though treated as slowpath, can become the
source of contention for the global lock taken for stat flushing because
when system or memcg is under memory pressure, many tasks may enter the
reclaim path.
This patch uses following mechanisms to solve these challenges:
1. Periodically flush the stats from root memcg every 2 seconds. This
will time limit the out of sync stats.
2. Asynchronously flush the stats after fixed number of stat updates.
In the worst case the stat can be out of sync by O(nr_cpus * BATCH) for
2 seconds.
3. For avoiding thundering herd to flush the stats particularly from
the memory reclaim context, introduce memcg local spinlock and let only
one flusher active at a time. This could have been done through
cgroup_rstat_lock lock but that lock is used by other subsystem and for
userspace reading memcg stats. So, it is better to keep flushers
introduced by this patch decoupled from cgroup_rstat_lock.
Link: https://lkml.kernel.org/r/20210714013948.270662-2-shakeelb@xxxxxxxxxx
Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Hillf Danton <hdanton@xxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Michal Koutný <mkoutny@xxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 6 ++++++
mm/memcontrol.c | 34 ++++++++++++++++++++++++++++++++++
mm/vmscan.c | 6 ++++++
3 files changed, 46 insertions(+)
--- a/include/linux/memcontrol.h~memcg-infrastructure-to-flush-memcg-stats
+++ a/include/linux/memcontrol.h
@@ -1013,6 +1013,8 @@ static inline unsigned long lruvec_page_
return x;
}
+void mem_cgroup_flush_stats(void);
+
void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
int val);
void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val);
@@ -1422,6 +1424,10 @@ static inline unsigned long lruvec_page_
return node_page_state(lruvec_pgdat(lruvec), idx);
}
+static inline void mem_cgroup_flush_stats(void)
+{
+}
+
static inline void __mod_memcg_lruvec_state(struct lruvec *lruvec,
enum node_stat_item idx, int val)
{
--- a/mm/memcontrol.c~memcg-infrastructure-to-flush-memcg-stats
+++ a/mm/memcontrol.c
@@ -103,6 +103,14 @@ static bool do_memsw_account(void)
return !cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_noswap;
}
+/* memcg and lruvec stats flushing */
+static void flush_memcg_stats_dwork(struct work_struct *w);
+static DECLARE_DEFERRABLE_WORK(stats_flush_dwork, flush_memcg_stats_dwork);
+static void flush_memcg_stats_work(struct work_struct *w);
+static DECLARE_WORK(stats_flush_work, flush_memcg_stats_work);
+static DEFINE_PER_CPU(unsigned int, stats_flush_threshold);
+static DEFINE_SPINLOCK(stats_flush_lock);
+
#define THRESHOLDS_EVENTS_TARGET 128
#define SOFTLIMIT_EVENTS_TARGET 1024
@@ -685,6 +693,8 @@ void __mod_memcg_lruvec_state(struct lru
/* Update lruvec */
__this_cpu_add(pn->lruvec_stats_percpu->state[idx], val);
+ if (!(__this_cpu_inc_return(stats_flush_threshold) % MEMCG_CHARGE_BATCH))
+ queue_work(system_unbound_wq, &stats_flush_work);
}
/**
@@ -5248,6 +5258,10 @@ static int mem_cgroup_css_online(struct
/* Online state pins memcg ID, memcg ID pins CSS */
refcount_set(&memcg->id.ref, 1);
css_get(css);
+
+ if (unlikely(mem_cgroup_is_root(memcg)))
+ queue_delayed_work(system_unbound_wq, &stats_flush_dwork,
+ 2UL*HZ);
return 0;
}
@@ -5339,6 +5353,26 @@ static void mem_cgroup_css_reset(struct
memcg_wb_domain_size_changed(memcg);
}
+void mem_cgroup_flush_stats(void)
+{
+ if (!spin_trylock(&stats_flush_lock))
+ return;
+
+ cgroup_rstat_flush(root_mem_cgroup->css.cgroup);
+ spin_unlock(&stats_flush_lock);
+}
+
+static void flush_memcg_stats_dwork(struct work_struct *w)
+{
+ mem_cgroup_flush_stats();
+ queue_delayed_work(system_unbound_wq, &stats_flush_dwork, 2UL*HZ);
+}
+
+static void flush_memcg_stats_work(struct work_struct *w)
+{
+ mem_cgroup_flush_stats();
+}
+
static void mem_cgroup_css_rstat_flush(struct cgroup_subsys_state *css, int cpu)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
--- a/mm/vmscan.c~memcg-infrastructure-to-flush-memcg-stats
+++ a/mm/vmscan.c
@@ -2893,6 +2893,12 @@ static void shrink_node(pg_data_t *pgdat
target_lruvec = mem_cgroup_lruvec(sc->target_mem_cgroup, pgdat);
again:
+ /*
+ * Flush the memory cgroup stats, so that we read accurate per-memcg
+ * lruvec stats for heuristics.
+ */
+ mem_cgroup_flush_stats();
+
memset(&sc->nr, 0, sizeof(sc->nr));
nr_reclaimed = sc->nr_reclaimed;
_
Patches currently in -mm which might be from shakeelb@xxxxxxxxxx are
memcg-switch-lruvec-stats-to-rstat.patch
memcg-infrastructure-to-flush-memcg-stats.patch
