linux-kernel - Re: [RFC PATCH v1 2/8] sched/deadline: move cpu frequency selection triggering points

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Date:   Fri, 7 Jul 2017 12:51:04 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Juri Lelli <juri.lelli@....com>
Cc:     peterz@...radead.org, mingo@...hat.com, rjw@...ysocki.net,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        tglx@...utronix.de, vincent.guittot@...aro.org,
        rostedt@...dmis.org, luca.abeni@...tannapisa.it,
        claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
        bristot@...hat.com, mathieu.poirier@...aro.org, tkjos@...roid.com,
        joelaf@...gle.com, andresoportus@...gle.com,
        morten.rasmussen@....com, dietmar.eggemann@....com,
        patrick.bellasi@....com, Ingo Molnar <mingo@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [RFC PATCH v1 2/8] sched/deadline: move cpu frequency selection
 triggering points

On 05-07-17, 09:58, Juri Lelli wrote:
> Since SCHED_DEADLINE doesn't track utilization signal (but reserves a
> fraction of CPU bandwidth to tasks admitted to the system), there is no
> point in evaluating frequency changes during each tick event.
> 
> Move frequency selection triggering points to where running_bw changes.
> 
> Co-authored-by: Claudio Scordino <claudio@...dence.eu.com>
> Signed-off-by: Juri Lelli <juri.lelli@....com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Cc: Luca Abeni <luca.abeni@...tannapisa.it>
> ---
> Changes from RFCv0:
> 
>  - modify comment regarding periodic RT updates (Claudio)
> ---
>  kernel/sched/deadline.c |  7 ++++---
>  kernel/sched/sched.h    | 12 ++++++------
>  2 files changed, 10 insertions(+), 9 deletions(-)

Reviewed-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh