linux-kernel - Re: [PATCH] sched/fair: Make PELT signal more accurate

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Message-ID: <20170810103732.u5q5xojsbhq2a4ij@hirez.programming.kicks-ass.net>
Date:   Thu, 10 Aug 2017 12:37:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Joel Fernandes <joelaf@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel-team@...roid.com, Juri Lelli <juri.lelli@....com>,
        Brendan Jackman <brendan.jackman@....com>,
        Dietmar Eggeman <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] sched/fair: Make PELT signal more accurate

On Thu, Aug 10, 2017 at 09:17:34AM +0200, Vincent Guittot wrote:
> Ah! this is quite confusing and not obvious that the trace is not for
> 1 signal but in fact 2 signals are interleaved and only 1 is displayed
> and that we have to filter them
> 
> So ok i can see that the trace with cfs_rq=1 is not updated. At the
> opposite, we can see that the other trace (for the se i assume) is
> updated normally whereas they are normally synced on the same clock

So I'm still sitting on those patches that sync up the PELT window
between group-cfs_rq and its corresponding group-se.

I was hoping to get around to looking at all that again and adding
Josef's last few patches and promoting the lot from /experimental to
/core before going on holidays next week, but we'll see.