[PATCH] sched/fair: Update rq clock before updating nohz cpu load

[Matt Fleming]

If we're accessing rq_clock() (e.g. in sched_avg_update()) we should
update the rq clock before calling cpu_load_update(), otherwise any
time calculations will be stale.

All other paths currently call update_rq_clock().

Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Mike Galbraith <umgwanakikb...@gmail.com>
Cc: Mel Gorman <mgor...@techsingularity.net>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Rik van Riel <r...@redhat.com>
Signed-off-by: Matt Fleming <m...@codeblueprint.co.uk>
---
 kernel/sched/fair.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index b8a33abce650..aa9ba82f0d7c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4723,6 +4723,7 @@ void cpu_load_update_nohz_stop(void)
 
        load = weighted_cpuload(cpu_of(this_rq));
        raw_spin_lock(&this_rq->lock);
+       update_rq_clock(this_rq);
        cpu_load_update_nohz(this_rq, curr_jiffies, load);
        raw_spin_unlock(&this_rq->lock);
 }
-- 
2.7.3