linux-kernel - Re: [RFC/RFT][PATCH 1/2] cpufreq: schedutil: Use policy-dependent transition delays

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Message-ID: <20170411111443.GE13627@vireshk-i7>
Date:   Tue, 11 Apr 2017 16:44:43 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        Juri Lelli <juri.lelli@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Joel Fernandes <joelaf@...gle.com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Brendan Jackman <brendan.jackman@....com>
Subject: Re: [RFC/RFT][PATCH 1/2] cpufreq: schedutil: Use policy-dependent
 transition delays

On 11-04-17, 00:20, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Make the schedutil governor take the initial (default) value of the
> rate_limit_us sysfs attribute from the (new) transition_delay_us
> policy parameter (to be set by the scaling driver).
> 
> That will allow scaling drivers to make schedutil use smaller default
> values of rate_limit_us and reduce the default average time interval
> between consecutive frequency changes.
> 
> Make intel_pstate set transition_delay_us to 500.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> 
> This is a replacement for https://patchwork.kernel.org/patch/9671831/
> 
> ---
>  drivers/cpufreq/intel_pstate.c   |    2 ++
>  include/linux/cpufreq.h          |    7 +++++++
>  kernel/sched/cpufreq_schedutil.c |   15 ++++++++++-----
>  3 files changed, 19 insertions(+), 5 deletions(-)

Should we use this new value for the ondemand/conservative governors as well?

-- 
viresh