linux-kernel - Re: [PATCH v2 0/4] Utilization estimation (util

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Message-ID: <20171213160357.3se4vvyo5lqud2uo@hirez.programming.kicks-ass.net>
Date:   Wed, 13 Dec 2017 17:03:57 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Patrick Bellasi <patrick.bellasi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Paul Turner <pjt@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Todd Kjos <tkjos@...roid.com>,
        Joel Fernandes <joelaf@...gle.com>
Subject: Re: [PATCH v2 0/4] Utilization estimation (util_est) for FAIR tasks

On Tue, Dec 05, 2017 at 05:10:14PM +0000, Patrick Bellasi wrote:
> With this feature enabled, the measured overhead is in the range of ~1%
> on the same HW/SW test configuration.

That's quite a lot; did you look where that comes from?