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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: peterz@infradead.org, mingo@kernel.org,
	linux-kernel@vger.kernel.org, rjw@rjwysocki.net,
	juri.lelli@redhat.com, dietmar.eggemann@arm.com,
	Morten.Rasmussen@arm.com, valentin.schneider@arm.com,
	patrick.bellasi@arm.com, joel@joelfernandes.org,
	daniel.lezcano@linaro.org, quentin.perret@arm.com,
	luca.abeni@santannapisa.it, claudio@evidence.eu.com,
	Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH 03/11] cpufreq/schedutil: use rt utilization tracking
Date: Fri, 6 Jul 2018 11:26:46 +0530	[thread overview]
Message-ID: <20180706055646.47iu4gktby4trjmq@vireshk-i7> (raw)
In-Reply-To: <1530200714-4504-4-git-send-email-vincent.guittot@linaro.org>

On 28-06-18, 17:45, Vincent Guittot wrote:
> Add both cfs and rt utilization when selecting an OPP for cfs tasks as rt
> can preempt and steal cfs's running time.
> 
> rt util_avg is used to take into account the utilization of rt tasks
> on the CPU when selecting OPP. If a rt task migrate, the rt utilization
> will not migrate but will decay over time. On an overloaded CPU, cfs
> utilization reflects the remaining utilization avialable on CPU. When rt
> task migrates, the cfs utilization will increase when tasks will start to
> use the newly available capacity. At the same pace, rt utilization will
> decay and both variations will compensate each other  to keep unchanged
> overall utilization and will prevent any OPP drop.
> 
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
> ---
>  kernel/sched/cpufreq_schedutil.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

-- 
viresh

  reply	other threads:[~2018-07-06  5:56 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-28 15:45 [PATCH v7 00/11] track CPU utilization Vincent Guittot
2018-06-28 15:45 ` [PATCH 01/11] sched/pelt: Move pelt related code in a dedicated file Vincent Guittot
2018-07-15 23:26   ` [tip:sched/core] sched/pelt: Move PELT " tip-bot for Vincent Guittot
2018-06-28 15:45 ` [PATCH 02/11] sched/rt: add rt_rq utilization tracking Vincent Guittot
2018-07-15 23:27   ` [tip:sched/core] sched/rt: Add " tip-bot for Vincent Guittot
2018-06-28 15:45 ` [PATCH 03/11] cpufreq/schedutil: use rt " Vincent Guittot
2018-07-06  5:56   ` Viresh Kumar [this message]
2018-07-15 23:27   ` [tip:sched/core] cpufreq/schedutil: Use RT " tip-bot for Vincent Guittot
2018-06-28 15:45 ` [PATCH 04/11] sched/dl: add dl_rq " Vincent Guittot
2018-07-15 23:28   ` [tip:sched/core] sched/dl: Add " tip-bot for Vincent Guittot
2018-06-28 15:45 ` [PATCH 05/11] cpufreq/schedutil: use dl " Vincent Guittot
2018-07-06  5:59   ` Viresh Kumar
2018-07-15 23:28   ` [tip:sched/core] cpufreq/schedutil: Use DL " tip-bot for Vincent Guittot
2018-06-28 15:45 ` [PATCH 06/11] sched/irq: add irq " Vincent Guittot
2018-07-15 23:29   ` [tip:sched/core] sched/irq: Add IRQ " tip-bot for Vincent Guittot
2018-07-26  3:09   ` [PATCH 06/11] sched/irq: add irq " Wanpeng Li
2018-07-30 16:43     ` Vincent Guittot
2018-07-31  3:32       ` Wanpeng Li
2018-07-31  8:21         ` Vincent Guittot
2018-06-28 15:45 ` [PATCH 07/11] cpufreq/schedutil: take into account interrupt Vincent Guittot
2018-07-06  6:00   ` Viresh Kumar
2018-07-06  9:14     ` Peter Zijlstra
2018-07-06  9:21       ` Vincent Guittot
2018-07-15 23:29   ` [tip:sched/core] cpufreq/schedutil: Take time spent in interrupts into account tip-bot for Vincent Guittot
2018-06-28 15:45 ` [PATCH 08/11] sched: schedutil: remove sugov_aggregate_util() Vincent Guittot
2018-07-06  6:02   ` Viresh Kumar
2018-07-15 23:30   ` [tip:sched/core] sched/cpufreq: Remove sugov_aggregate_util() tip-bot for Vincent Guittot
2018-06-28 15:45 ` [PATCH 09/11] sched: use pelt for scale_rt_capacity() Vincent Guittot
2018-07-15 22:15   ` Ingo Molnar
2018-07-15 22:46     ` Joe Perches
2018-07-16 11:24     ` Vincent Guittot
2018-07-16 11:39       ` Ingo Molnar
2018-07-15 23:32   ` [tip:sched/core] sched/core: Use PELT " tip-bot for Vincent Guittot
2018-06-28 15:45 ` [PATCH 10/11] sched: remove rt_avg code Vincent Guittot
2018-07-15 23:33   ` [tip:sched/core] sched/core: Remove the " tip-bot for Vincent Guittot
2018-06-28 15:45 ` [PATCH 11/11] proc/sched: remove unused sched_time_avg_ms Vincent Guittot
2018-06-28 15:51   ` Luis R. Rodriguez
2018-06-29  5:49     ` Vincent Guittot
2018-07-15 23:33   ` [tip:sched/core] sched/sysctl: Remove unused sched_time_avg_ms sysctl tip-bot for Vincent Guittot
2018-07-05 12:36 ` [PATCH v7 00/11] track CPU utilization Peter Zijlstra
2018-07-05 13:32   ` Vincent Guittot
2018-07-06  6:05   ` Viresh Kumar
2018-07-06  9:18     ` Peter Zijlstra
2018-07-15 23:34   ` [tip:sched/core] sched/cpufreq: Clarify sugov_get_util() tip-bot for Peter Zijlstra

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