The commit is pushed to "branch-rh7-3.10.0-123.1.2-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-123.1.2.vz7.5.9
------>
commit 2f88f9da5c4dad028bd97bc5085b413d772449fa
Author: Vladimir Davydov <[email protected]>
Date: Thu Jun 4 15:53:32 2015 +0400
sched: Port diff-sched-clear-prev-entity-if-curr-is-dequeued
Author: Vladimir Davydov
Email: [email protected]
Subject: sched: clear prev entity if curr is dequeued
Date: Fri, 20 Sep 2013 16:55:23 +0400
cfs_rq->prev is used for ctxsw accounting: on put_prev_entity()
cfs_rq->prev is set to curr if curr is on rq, and on set_next_entity()
nr_switches is increased if curr != prev. However, If the current task
goes to sleep, cfs_rq->prev won't be updated, which will lead to a ctxsw
not accounted. The patch fixes this by clearing cfs_rq->prev if current
is not on rq.
Signed-off-by: Vladimir Davydov <[email protected]>
=============================================================================
Related to https://jira.sw.ru/browse/PSBM-33642
Signed-off-by: Vladimir Davydov <[email protected]>
---
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 ec866ed..7f1ff1d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3295,7 +3295,8 @@ static void put_prev_entity(struct cfs_rq *cfs_rq, struct
sched_entity *prev)
/* in !on_rq case, update occurred at dequeue */
update_entity_load_avg(prev, 1);
cfs_rq->prev = prev;
- }
+ } else
+ cfs_rq->prev = NULL;
cfs_rq->curr = NULL;
}
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