linux-kernel - Re: [PATCH v6 07/16] sched/core: uclamp: Add system default clamps

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Message-ID: <20190123092210.GU27931@hirez.programming.kicks-ass.net>
Date:   Wed, 23 Jan 2019 10:22:10 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Patrick Bellasi <patrick.bellasi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-api@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Tejun Heo <tj@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Paul Turner <pjt@...gle.com>,
        Quentin Perret <quentin.perret@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Todd Kjos <tkjos@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Steve Muckle <smuckle@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [PATCH v6 07/16] sched/core: uclamp: Add system default clamps

On Tue, Jan 22, 2019 at 03:41:29PM +0000, Patrick Bellasi wrote:
> On 22-Jan 16:13, Peter Zijlstra wrote:
> > On Tue, Jan 22, 2019 at 02:43:29PM +0000, Patrick Bellasi wrote:

> > > Do you think that could be acceptable?
> > 
> > Think so, it's a sysctl poke, 'nobody' ever does that.
> 
> Cool, so... I'll keep lazy update for system default.

Ah, I think I misunderstood. I meant to say that since nobody ever pokes
at sysctl's it doesn't matter if its a little more expensive and iterate
everything.

Also; if you always keep everything up-to-date, you can avoid doing that
duplicate accounting.