diff options
| -rw-r--r-- | mm/memcontrol.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 2b831cc48c7d..c65751ab4516 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -626,7 +626,14 @@ static inline void memcg_rstat_updated(struct mem_cgroup *memcg, int val) x = __this_cpu_add_return(stats_updates, abs(val)); if (x > MEMCG_CHARGE_BATCH) { - atomic_add(x / MEMCG_CHARGE_BATCH, &stats_flush_threshold); + /* + * If stats_flush_threshold exceeds the threshold + * (>num_online_cpus()), cgroup stats update will be triggered + * in __mem_cgroup_flush_stats(). Increasing this var further + * is redundant and simply adds overhead in atomic update. + */ + if (atomic_read(&stats_flush_threshold) <= num_online_cpus()) + atomic_add(x / MEMCG_CHARGE_BATCH, &stats_flush_threshold); __this_cpu_write(stats_updates, 0); } } |