sched/fair: Implement update_blocked_averages() for CONFIG_FAIR_GROUP…

…_SCHED=n The load and the utilization of idle CPUs must be updated periodically in order to decay the blocked part. If CONFIG_FAIR_GROUP_SCHED is not set, the load and util of idle cpus are not decayed and stay at the values set before becoming idle. Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Yuyang Du <yuyang.du@intel.com> 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: arjan@linux.intel.com Cc: bsegall@google.com Cc: dietmar.eggemann@arm.com Cc: fengguang.wu@intel.com Cc: len.brown@intel.com Cc: morten.rasmussen@arm.com Cc: pjt@google.com Cc: rafael.j.wysocki@intel.com Cc: umgwanakikbuti@gmail.com Link: http://lkml.kernel.org/r/1436918682-4971-4-git-send-email-yuyang.du@intel.com [ Fixed up the SOB chain. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
sassmann · Aug 3, 2015 · 6c1d47c · 6c1d47c
1 parent 9d89c25
commit 6c1d47c
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
@@ -5846,6 +5846,14 @@ static unsigned long task_h_load(struct task_struct *p)
 #else
 static inline void update_blocked_averages(int cpu)
 {
+	struct rq *rq = cpu_rq(cpu);
+	struct cfs_rq *cfs_rq = &rq->cfs;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&rq->lock, flags);
+	update_rq_clock(rq);
+	update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq);
+	raw_spin_unlock_irqrestore(&rq->lock, flags);
 }
 
 static unsigned long task_h_load(struct task_struct *p)