linux-kernel - [PATCH 0/2] track rt rq utilization

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Message-Id: <1495616452-7582-1-git-send-email-vincent.guittot@linaro.org>
Date:   Wed, 24 May 2017 11:00:50 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     rjw@...ysocki.net, juri.lelli@....com, dietmar.eggemann@....com,
        Morten.Rasmussen@....com,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH 0/2] track rt rq utilization

When both cfs and rt tasks compete to run on a CPU, we can see some frequency
drops with schedutil governor. In such case, the cfs_rq's utilization doesn't
reflect anymore the utilization of cfs tasks but only the remaining part that
is not used by rt tasks. We should monitor the stolen utilization and take
it into account when selecting OPP.

Patch 1 tracks utilization of rt_rq.
Patch 2 adds the rt_rq's utilization when selection OPP for cfs tasks

This patchset doesn't change the OPP selection policy for RT tasks

Vincent Guittot (2):
  sched/rt: add utilization tracking
  cpufreq/schedutil: add rt utilization tracking

 kernel/sched/cpufreq_schedutil.c |  2 +-
 kernel/sched/fair.c              | 21 +++++++++++++++++++++
 kernel/sched/rt.c                |  9 +++++++++
 kernel/sched/sched.h             |  3 +++
 4 files changed, 34 insertions(+), 1 deletion(-)

-- 
2.7.4