[PATCH v2 2/2] memcg: unify memcg stat flushing

[Shakeel Butt]

The memcg stats can be flushed in multiple context and potentially in
parallel too.  For example multiple parallel user space readers for memcg
stats will contend on the rstat locks with each other.  There is no need
for that.  We just need one flusher and everyone else can benefit.  In
addition after aa48e47e3906 ("memcg: infrastructure to flush memcg stats")
the kernel periodically flush the memcg stats from the root, so, the other
flushers will potentially have much less work to do.

Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: "Michal Koutný" <mkoutny@xxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Changelog since v1:
- N/A

 mm/memcontrol.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 25f55636ca37..22d905f30a30 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -638,12 +638,14 @@ static inline void memcg_rstat_updated(struct mem_cgroup *memcg)
 
 static void __mem_cgroup_flush_stats(void)
 {
-	if (!spin_trylock(&stats_flush_lock))
+	unsigned long flag;
+
+	if (!spin_trylock_irqsave(&stats_flush_lock, flag))
 		return;
 
 	cgroup_rstat_flush_irqsafe(root_mem_cgroup->css.cgroup);
 	atomic_set(&stats_flush_threshold, 0);
-	spin_unlock(&stats_flush_lock);
+	spin_unlock_irqrestore(&stats_flush_lock, flag);
 }
 
 void mem_cgroup_flush_stats(void)
@@ -1462,7 +1464,7 @@ static char *memory_stat_format(struct mem_cgroup *memcg)
 	 *
 	 * Current memory state:
 	 */
-	cgroup_rstat_flush(memcg->css.cgroup);
+	mem_cgroup_flush_stats();
 
 	for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
 		u64 size;
@@ -3566,8 +3568,7 @@ static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
 	unsigned long val;
 
 	if (mem_cgroup_is_root(memcg)) {
-		/* mem_cgroup_threshold() calls here from irqsafe context */
-		cgroup_rstat_flush_irqsafe(memcg->css.cgroup);
+		mem_cgroup_flush_stats();
 		val = memcg_page_state(memcg, NR_FILE_PAGES) +
 			memcg_page_state(memcg, NR_ANON_MAPPED);
 		if (swap)
@@ -3948,7 +3949,7 @@ static int memcg_numa_stat_show(struct seq_file *m, void *v)
 	int nid;
 	struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
 
-	cgroup_rstat_flush(memcg->css.cgroup);
+	mem_cgroup_flush_stats();
 
 	for (stat = stats; stat < stats + ARRAY_SIZE(stats); stat++) {
 		seq_printf(m, "%s=%lu", stat->name,
@@ -4020,7 +4021,7 @@ static int memcg_stat_show(struct seq_file *m, void *v)
 
 	BUILD_BUG_ON(ARRAY_SIZE(memcg1_stat_names) != ARRAY_SIZE(memcg1_stats));
 
-	cgroup_rstat_flush(memcg->css.cgroup);
+	mem_cgroup_flush_stats();
 
 	for (i = 0; i < ARRAY_SIZE(memcg1_stats); i++) {
 		unsigned long nr;
@@ -4523,7 +4524,7 @@ void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
 	struct mem_cgroup *memcg = mem_cgroup_from_css(wb->memcg_css);
 	struct mem_cgroup *parent;
 
-	cgroup_rstat_flush_irqsafe(memcg->css.cgroup);
+	mem_cgroup_flush_stats();
 
 	*pdirty = memcg_page_state(memcg, NR_FILE_DIRTY);
 	*pwriteback = memcg_page_state(memcg, NR_WRITEBACK);
@@ -6408,7 +6409,7 @@ static int memory_numa_stat_show(struct seq_file *m, void *v)
 	int i;
 	struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
 
-	cgroup_rstat_flush(memcg->css.cgroup);
+	mem_cgroup_flush_stats();
 
 	for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
 		int nid;
-- 
2.33.0.800.g4c38ced690-goog