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Commit 21f44866 authored by Morten Rasmussen's avatar Morten Rasmussen Committed by Ingo Molnar
Browse files

sched: Track group sched_entity usage contributions 



Add usage contribution tracking for group entities. Unlike
se->avg.load_avg_contrib, se->avg.utilization_avg_contrib for group
entities is the sum of se->avg.utilization_avg_contrib for all entities on the
group runqueue.

It is _not_ influenced in any way by the task group h_load. Hence it is
representing the actual cpu usage of the group, not its intended load
contribution which may differ significantly from the utilization on
lightly utilized systems.

Signed-off-by: default avatarMorten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: default avatarVincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Paul Turner <pjt@google.com>
Cc: Ben Segall <bsegall@google.com>
Cc: Ben Segall <bsegall@google.com>
Cc: Morten.Rasmussen@arm.com
Cc: Paul Turner <pjt@google.com>
Cc: dietmar.eggemann@arm.com
Cc: efault@gmx.de
Cc: kamalesh@linux.vnet.ibm.com
Cc: linaro-kernel@lists.linaro.org
Cc: nicolas.pitre@linaro.org
Cc: preeti@linux.vnet.ibm.com
Cc: riel@redhat.com
Link: http://lkml.kernel.org/r/1425052454-25797-3-git-send-email-vincent.guittot@linaro.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 36ee28e4

kernel/sched/debug.c

+2 −0
Original line number Diff line number Diff line
@@ -94,8 +94,10 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group 
	P(se->load.weight);

#ifdef CONFIG_SMP

	P(se->avg.runnable_avg_sum);

	P(se->avg.running_avg_sum);

	P(se->avg.avg_period);

	P(se->avg.load_avg_contrib);

	P(se->avg.utilization_avg_contrib);

	P(se->avg.decay_count);

#endif

#undef PN

kernel/sched/fair.c

+3 −0
Original line number Diff line number Diff line
@@ -2747,6 +2747,9 @@ static long __update_entity_utilization_avg_contrib(struct sched_entity *se) 


	if (entity_is_task(se))

		__update_task_entity_utilization(se);

	else

		se->avg.utilization_avg_contrib =

					group_cfs_rq(se)->utilization_load_avg;



	return se->avg.utilization_avg_contrib - old_contrib;

}