[tip:sched/core] sched/fair: Have task_move_group_fair() also detach entity load from the old runqueue

[tip-bot for Byungchul Park <tipbot@zytor.com>]

Commit-ID:  1746babbb15594ba2d8d8196589bbbc2b5ff51c9
Gitweb:     http://git.kernel.org/tip/1746babbb15594ba2d8d8196589bbbc2b5ff51c9
Author:     Byungchul Park <byungchul.park@lge.com>
AuthorDate: Thu, 20 Aug 2015 20:21:58 +0900
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 13 Sep 2015 09:52:47 +0200

sched/fair: Have task_move_group_fair() also detach entity load from the old runqueue

Since we attach the entity load to the new runqueue, we should also
detatch the entity load from the old runqueue, otherwise load can
accumulate.

Signed-off-by: Byungchul Park <byungchul.park@lge.com>
[ Rewrote the changelog. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: yuyang.du@intel.com
Link: http://lkml.kernel.org/r/1440069720-27038-4-git-send-email-byungchul.park@lge.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/sched/fair.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 959b2ea..1e1fe7f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -8037,8 +8037,12 @@ static void task_move_group_fair(struct task_struct *p, int queued)
 	if (!queued && (!se->sum_exec_runtime || p->state == TASK_WAKING))
 		queued = 1;
 
+	cfs_rq = cfs_rq_of(se);
 	if (!queued)
-		se->vruntime -= cfs_rq_of(se)->min_vruntime;
+		se->vruntime -= cfs_rq->min_vruntime;
+
+	/* Synchronize task with its prev cfs_rq */
+	detach_entity_load_avg(cfs_rq, se);
 	set_task_rq(p, task_cpu(p));
 	se->depth = se->parent ? se->parent->depth + 1 : 0;
 	cfs_rq = cfs_rq_of(se);