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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: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter 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: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Morten Rasmussen 2015-02-27 16:54:05 +01:00 committed by Ingo Molnar
parent 36ee28e45d
commit 21f4486630
2 changed files with 5 additions and 0 deletions
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2
kernel/sched/debug.c
View File

@ -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

3
kernel/sched/fair.c
View File

@ -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;
}