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From: Vincent Guittot <vincent.guittot@linaro.org>
Date: Fri, 14 Apr 2017 10:47:28 +0200
Message-ID: <CAKfTPtBeLMzpQANqY8=1CX7Ua8fBhCs0yM=4HWsxgvnjxFomvQ@mail.gmail.com>
Subject: Re: [PATCH v2] sched/fair: update scale invariance of PELT
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Morten Rasmussen <Morten.Rasmussen@arm.com>,
        Yuyang Du <yuyang.du@intel.com>, Paul Turner <pjt@google.com>,
        Ben Segall <bsegall@google.com>
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On 13 April 2017 at 20:06, Peter Zijlstra <peterz@infradead.org> wrote:
> On Thu, Apr 13, 2017 at 04:59:15PM +0200, Vincent Guittot wrote:
>> On 13 April 2017 at 15:32, Peter Zijlstra <peterz@infradead.org> wrote:
>> > On Wed, Apr 12, 2017 at 01:28:58PM +0200, Peter Zijlstra wrote:
>> >
>> >> I still wonder about the whole !running vs !weight thing.,
>> >
>> > Ah, since we use this for both util _and_ load, we need !running &&
>> > !weight, and it so happens that !weight implies !running. Is that it?
>>
>> exactly
>> sorry, I should have started with that
>
> Damn, that just bring me around to wondering why running is the right
> condition to create lost-time.
>
> Because for runnable we want everything that has weight.

I have considered that the waiting time doesn't have to be scaled
unlike the running time of the runnable because waiting is the same
whatever the current capacity

>