linux-kernel - Re: CFS flat runqueue proposal fixes/update

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Message-ID: <9ed51691d4e129b5c30343a89a107d4ff9dd89ce.camel@surriel.com>
Date:   Fri, 07 Aug 2020 15:41:57 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Dietmar Eggemann <dietmar.eggemann@....com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Paul Turner <pjt@...gle.com>,
        "vincent.guittot" <vincent.guittot@...aro.org>, kernel-team@...com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dietmar.eggeman" <dietmar.eggeman@....com>
Subject: Re: CFS flat runqueue proposal fixes/update

On Fri, 2020-08-07 at 16:14 +0200, Dietmar Eggemann wrote:
> On 31/07/2020 09:42, Rik van Riel wrote:
> >     Possible solution
> > ...
> I imagine that I can see what you want to achieve here ;-)
> 
> But it's hard since your v5 RFC
> https://lkml.kernel.org/r/20190906191237.27006-1-riel@surriel.com is
> pretty old by now.

The v5 patches also do not implement this new idea, and
still suffer from the corner cases that Paul Turner
pointed out last year.

> Do you have a version of the patch-set against tip/sched/core? Quite
> a
> lot has changed (runnable load avg replaced by runnable avg, rq->load 
> is
> gone, CFS load balance rework).

Not yet. We got a baby this spring, so I've been busy
with things like milk and diapers, instead of with
code.

I wanted to get this proposal out before Plumbers, so
we could at least talk about it, and maybe find flaws
with this idea before I spend weeks/months implementing it :)

> IMHO it would be extremely helpful to have a current patch-set to
> discuss how these other problems can be covered by patches on top.

Agreed. I hope to get some time to work on that, but
no guarantees about getting it ready before Plumbers :)

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