[Devel] [PATCH vz9 06/27] sched: Fix task_group "iowait_sum" statistic accounting

[Nikita Yushchenko]

From: Konstantin Khorenko <khorenko at virtuozzo.com>

Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
Reviewed-by: Andrey Ryabinin <aryabinin at virtuozzo.com>

(cherry-picked from vz8 commit 0e0747f3318b ("sched: Fix task_group
"iowait_sum" statistic accounting"))

Signed-off-by: Nikita Yushchenko <nikita.yushchenko at virtuozzo.com>
---
 kernel/sched/fair.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 556bd109049a..c0bf49db868d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1051,7 +1051,8 @@ update_stats_enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
 						delta >> 20);
 			}
 			account_scheduler_latency(tsk, delta >> 10, 0);
-		}
+		} else
+			__schedstat_add(se->statistics.iowait_sum, delta);
 	}
 }
 
-- 
2.30.2