[PATCH 2/5] sched: Update rq clock before setting fair group shares

From: Frederic Weisbecker
Date: Thu Apr 11 2013 - 19:58:12 EST

Because we may update the execution time (sched_group_set_shares()->
update_cfs_shares()->reweight_entity()->update_curr()) before
reweighting the entity while setting the group shares and this requires
an uptodate version of the runqueue clock.

Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Paul Turner <pjt@xxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
kernel/sched/fair.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 155783b..c23dde4 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6057,6 +6057,9 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
se = tg->se[i];
/* Propagate contribution to hierarchy */
raw_spin_lock_irqsave(&rq->lock, flags);
+ /* Possible calls to update_curr() need rq clock */
+ update_rq_clock(rq);
raw_spin_unlock_irqrestore(&rq->lock, flags);

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