Commit 070f5e86 authored by Vincent Guittot's avatar Vincent Guittot Committed by Ingo Molnar
Browse files

sched/fair: Take into account runnable_avg to classify group 



Take into account the new runnable_avg signal to classify a group and to
mitigate the volatility of util_avg in face of intensive migration or
new task with random utilization.

Signed-off-by: default avatarVincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: default avatarMel Gorman <mgorman@techsingularity.net>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Reviewed-by: default avatar"Dietmar Eggemann <dietmar.eggemann@arm.com&gt;">
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Phil Auld <pauld@redhat.com>
Cc: Hillf Danton <hdanton@sina.com>
Link: https://lore.kernel.org/r/20200224095223.13361-10-mgorman@techsingularity.net
parent 9f683953

kernel/sched/fair.c

+30 −1
Original line number Diff line number Diff line
@@ -5469,6 +5469,24 @@ static unsigned long cpu_runnable(struct rq *rq) 
	return cfs_rq_runnable_avg(&rq->cfs);

}



static unsigned long cpu_runnable_without(struct rq *rq, struct task_struct *p)

{

	struct cfs_rq *cfs_rq;

	unsigned int runnable;



	/* Task has no contribution or is new */

	if (cpu_of(rq) != task_cpu(p) || !READ_ONCE(p->se.avg.last_update_time))

		return cpu_runnable(rq);



	cfs_rq = &rq->cfs;

	runnable = READ_ONCE(cfs_rq->avg.runnable_avg);



	/* Discount task's runnable from CPU's runnable */

	lsub_positive(&runnable, p->se.avg.runnable_avg);



	return runnable;

}



static unsigned long capacity_of(int cpu)

{

	return cpu_rq(cpu)->cpu_capacity;
@@ -7752,7 +7770,8 @@ struct sg_lb_stats { 
	unsigned long avg_load; /*Avg load across the CPUs of the group */

	unsigned long group_load; /* Total load over the CPUs of the group */

	unsigned long group_capacity;

	unsigned long group_util; /* Total utilization of the group */

	unsigned long group_util; /* Total utilization over the CPUs of the group */

	unsigned long group_runnable; /* Total runnable time over the CPUs of the group */

	unsigned int sum_nr_running; /* Nr of tasks running in the group */

	unsigned int sum_h_nr_running; /* Nr of CFS tasks running in the group */

	unsigned int idle_cpus;
@@ -7973,6 +7992,10 @@ group_has_capacity(unsigned int imbalance_pct, struct sg_lb_stats *sgs) 
	if (sgs->sum_nr_running < sgs->group_weight)

		return true;



	if ((sgs->group_capacity * imbalance_pct) <

			(sgs->group_runnable * 100))

		return false;



	if ((sgs->group_capacity * 100) >

			(sgs->group_util * imbalance_pct))

		return true;
@@ -7998,6 +8021,10 @@ group_is_overloaded(unsigned int imbalance_pct, struct sg_lb_stats *sgs) 
			(sgs->group_util * imbalance_pct))

		return true;



	if ((sgs->group_capacity * imbalance_pct) <

			(sgs->group_runnable * 100))

		return true;



	return false;

}
@@ -8092,6 +8119,7 @@ static inline void update_sg_lb_stats(struct lb_env *env, 


		sgs->group_load += cpu_load(rq);

		sgs->group_util += cpu_util(i);

		sgs->group_runnable += cpu_runnable(rq);

		sgs->sum_h_nr_running += rq->cfs.h_nr_running;



		nr_running = rq->nr_running;
@@ -8367,6 +8395,7 @@ static inline void update_sg_wakeup_stats(struct sched_domain *sd, 


		sgs->group_load += cpu_load_without(rq, p);

		sgs->group_util += cpu_util_without(i, p);

		sgs->group_runnable += cpu_runnable_without(rq, p);

		local = task_running_on_cpu(i, p);

		sgs->sum_h_nr_running += rq->cfs.h_nr_running - local;

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