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Subject: Re: [PATCH v3 0/6] cpufreq: schedutil: fixes for flags updates
To:     Patrick Bellasi <patrick.bellasi@arm.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
        Ingo Molnar <mingo@redhat.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Juri Lelli <juri.lelli@redhat.com>,
        Todd Kjos <tkjos@android.com>,
        Joel Fernandes <joelaf@google.com>
References: <20171130114723.29210-1-patrick.bellasi@arm.com>
 <20171220153029.dqrtjbyowhqdl56r@hirez.programming.kicks-ass.net>
 <f574036c-7572-9b97-79a0-794ff48e4d49@evidence.eu.com>
 <20180206154319.GF5739@e110439-lin>
 <68afaf84-893e-6770-b9f1-619cd2b6dc9c@evidence.eu.com>
 <20180206183623.GH5739@e110439-lin>
From:   Claudio Scordino <claudio@evidence.eu.com>
Message-ID: <574fa064-3551-27e8-5abf-bd625ba928de@evidence.eu.com>
Date:   Thu, 8 Feb 2018 17:14:58 +0100
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Hi Patrick,

Il 06/02/2018 19:36, Patrick Bellasi ha scritto:
> On 06-Feb 19:14, Claudio Scordino wrote:
>> Hi Patrick,
> 
>>> At first glance, your proposal below makes to make sense.
>>>
>>> However, I'm wondering if we cannot get it working using
>>> rq->dl's provided information instead of flags?
>>
>> Yes, we can use the value of rq->dl to check if there has been an increase of the deadline utilization.
>> Even if schedutil might have been triggered by a different scheduling class, the effect should be almost the same.
>>
>> Below a potential patch. I've kept all frequency update decisions in a single point (i.e. sugov_should_update_freq).
>> Not yet tested (waiting for further comments).
> 
> I have a todo list entry to backport/test Peter's series on Android...
> will add this patch too. Thanks.

Please discard my latest patch, as the tests on Odroid have shown performance regressions
(likely due to sugov_next_freq_shared being called more often)

Never mind. I have already tested another (even simpler) patch.
Sending soon as a new thread on LKML.

Many thanks and best regards,

                 Claudio