linux-kernel - Re: [PATCH] sched: Introduce scaled capacity awareness in enqueue

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Message-ID: <20170601122827.5ptc3n47vvk2y7k7@hirez.programming.kicks-ass.net>
Date:   Thu, 1 Jun 2017 14:28:27 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Rohit Jain <rohit.k.jain@...cle.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        vincent.guittot@...aro.org, morten.rasmussen@....com,
        dietmar.eggemann@....com
Subject: Re: [PATCH] sched: Introduce scaled capacity awareness in enqueue

On Wed, May 31, 2017 at 03:19:46PM -0700, Rohit Jain wrote:

> > > 2) This scaled capacity is normalized and mapped into buckets.
> > Why?
> 
> This is done to deterministically define the CPUs which are low on
> capacities. By mapping it into buckets it becomes easier to do a
> percentile calculation.

*sigh*, you're really going to make me read and reverse engineer your
horrible code.. :/