linux-kernel - Re: [RFC/RFT] [PATCH 02/10] cpufreq: intel_pstate: Conditional frequency invariant accounting

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Message-ID: <efcccd63-d952-db31-29e7-1566e2b5089f@arm.com>
Date:   Fri, 18 May 2018 15:09:21 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Patrick Bellasi <patrick.bellasi@....com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...e.de>,
        Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Mel Gorman <mgorman@...hsingularity.net>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC/RFT] [PATCH 02/10] cpufreq: intel_pstate: Conditional
 frequency invariant accounting

Hi,

On 18/05/18 12:29, Peter Zijlstra wrote:
> On Fri, May 18, 2018 at 11:57:42AM +0100, Patrick Bellasi wrote:
>> Thus, my simple (maybe dumb) questions are:
>> - why can't we just fold turbo boost frequency into the existing concepts?
>> - what are the limitations of such a "simple" approach?
> 
> Perhaps... but does this not further complicate the whole capacity vs
> util thing we already have in say the misfit patches?

What do you mean by that ? Bear in mind, I'm a complete stranger to turbo
boost so I fail to see why, as Patrick puts it, it can't fit within the
existing concepts (i.e. max util is 1024 but is only reachable when turbo
boosted).