linux-kernel - [PATCH v2 2/7] sched/fair: Update rq clock before waking up new task

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Date:   Wed, 21 Sep 2016 14:38:08 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Byungchul Park <byungchul.park@....com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Luca Abeni <luca.abeni@...tn.it>,
        Rik van Riel <riel@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wanpeng Li <wanpeng.li@...mail.com>,
        Yuyang Du <yuyang.du@...el.com>,
        Petr Mladek <pmladek@...e.com>, Jan Kara <jack@...e.cz>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel@...r.kernel.org,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Galbraith <umgwanakikbuti@...il.com>,
        Matt Fleming <matt@...eblueprint.co.uk>
Subject: [PATCH v2 2/7] sched/fair: Update rq clock before waking up new task

When initialising an entity's util and load averages we need an up to
date runqueue clock.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Mike Galbraith <umgwanakikbuti@...il.com>
Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk>
---
 kernel/sched/fair.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ab1cf3866a5b..7f8a61e97599 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -731,7 +731,10 @@ void post_init_entity_util_avg(struct sched_entity *se)
 	struct cfs_rq *cfs_rq = cfs_rq_of(se);
 	struct sched_avg *sa = &se->avg;
 	long cap = (long)(SCHED_CAPACITY_SCALE - cfs_rq->avg.util_avg) / 2;
-	u64 now = cfs_rq_clock_task(cfs_rq);
+	u64 now;
+
+	update_rq_clock(rq_of(cfs_rq));
+	now = cfs_rq_clock_task(cfs_rq);
 
 	if (cap > 0) {
 		if (cfs_rq->avg.util_avg != 0) {
-- 
2.9.3