[PATCH v2 8/9] vmscan: memcg: sleep when flushing stats during reclaim

[Yosry Ahmed]

Memory reclaim is a sleepable context. Allow sleeping when flushing
memcg stats to avoid unnecessarily performing a lot of work without
sleeping. This can slow down reclaim code if flushing stats is taking
too long, but there is already multiple cond_resched()'s in reclaim
code.

Signed-off-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Acked-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a9511ccb936f..9c1c5e8b24b8 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2845,7 +2845,7 @@ static void prepare_scan_count(pg_data_t *pgdat, struct scan_control *sc)
 	 * Flush the memory cgroup stats, so that we read accurate per-memcg
 	 * lruvec stats for heuristics.
 	 */
-	mem_cgroup_flush_stats_atomic();
+	mem_cgroup_flush_stats();
 
 	/*
 	 * Determine the scan balance between anon and file LRUs.
-- 
2.40.0.348.gf938b09366-goog