linux-kernel - [tip:sched/core] sched: Track group sched

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Message-ID: <tip-21f4486630b0bd1b6dbcc04f61836987fa54278f@git.kernel.org>
Date:	Fri, 27 Mar 2015 04:40:18 -0700
From:	tip-bot for Morten Rasmussen <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	vincent.guittot@...aro.org, linux-kernel@...r.kernel.org,
	pjt@...gle.com, morten.rasmussen@....com, mingo@...nel.org,
	hpa@...or.com, tglx@...utronix.de, peterz@...radead.org,
	bsegall@...gle.com
Subject: [tip:sched/core] sched:
  Track group sched_entity usage contributions

Commit-ID:  21f4486630b0bd1b6dbcc04f61836987fa54278f
Gitweb:     http://git.kernel.org/tip/21f4486630b0bd1b6dbcc04f61836987fa54278f
Author:     Morten Rasmussen <morten.rasmussen@....com>
AuthorDate: Fri, 27 Feb 2015 16:54:05 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 27 Mar 2015 09:35:58 +0100

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@....com>
Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Paul Turner <pjt@...gle.com>
Cc: Ben Segall <bsegall@...gle.com>
Cc: Ben Segall <bsegall@...gle.com>
Cc: Morten.Rasmussen@....com
Cc: Paul Turner <pjt@...gle.com>
Cc: dietmar.eggemann@....com
Cc: efault@....de
Cc: kamalesh@...ux.vnet.ibm.com
Cc: linaro-kernel@...ts.linaro.org
Cc: nicolas.pitre@...aro.org
Cc: preeti@...ux.vnet.ibm.com
Cc: riel@...hat.com
Link: http://lkml.kernel.org/r/1425052454-25797-3-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/debug.c | 2 ++
 kernel/sched/fair.c  | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 578ff83..a245c1f 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -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
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 414408dd..d94a865 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -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;
 }
--
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