[PATCH 32/33] sched: Update rq clock before rt sched average scale

[Frederic Weisbecker <fweisbec@gmail.com>]

When we restart the tick, we catch up with the CPU loads
statistics. But we also scale down the rt power. This
require an uptodate rq clock.

DISCLAIMER: I don't know if this is needed when we wake
up from idle. May be this is handled from the reader side
in scale_rt_power(). I have yet to understand exactly what
this function does.

Also scale_rt_power() also need to handle full tickless
CPUs when they run RT tasks. And also to remotely handle
the missing scaling down usually performed from the tick.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Alessio Igor Bogani <abogani@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/sched/core.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 8dfc461..b35d122 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2650,6 +2650,7 @@ void update_cpu_load_nohz(void)
 	pending_updates = curr_jiffies - this_rq->last_load_update_tick;
 	if (pending_updates) {
 		this_rq->last_load_update_tick = curr_jiffies;
+		update_rq_clock(this_rq);
 		/*
 		 * We were idle, this means load 0, the current load might be
 		 * !0 due to remote wakeups and the sort.
-- 
1.7.5.4