linux-kernel - Re: [PATCH] Revert "cpufreq: schedutil: Don't restrict kthread to related

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Message-ID: <20180508111451.rmoi2rk3md6lhbvl@vireshk-i7>
Date:   Tue, 8 May 2018 16:44:51 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Quentin Perret <quentin.perret@....com>
Cc:     Dietmar Eggemann <dietmar.eggemann@....com>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, linux-pm@...r.kernel.org,
        Pavan Kondeti <pkondeti@...eaurora.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Patrick Bellasi <patrick.bellasi@....com>
Subject: Re: [PATCH] Revert "cpufreq: schedutil: Don't restrict kthread to
 related_cpus unnecessarily"

On 08-05-18, 12:00, Quentin Perret wrote:
> Right, I see your point. Now, with the current implementation, why should
> we randomly force a CPU to manage the kthread of another ? IIUC deadline
> should assign the kthreads to CPUs depending on the state of the system
> when the task is created. So, from one boot to another, you could
> theoretically end up with varying configurations, and varying power/perf
> numbers.

Yeah, if it is fixed at boot then there is no good reason to push it
to any other CPU. I agree.

-- 
viresh