linux-kernel - Re: [RFC][PATCH 00/14] sched/fair: A bit of a cgroup/PELT overhaul (again)..

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Message-ID: <20170516220217.GA21241@htj.duckdns.org>
Date:   Tue, 16 May 2017 18:02:17 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, vincent.guittot@...aro.org,
        efault@....de, pjt@...gle.com, clm@...com,
        dietmar.eggemann@....com, morten.rasmussen@....com,
        bsegall@...gle.com, yuyang.du@...el.com
Subject: Re: [RFC][PATCH 00/14] sched/fair: A bit of a cgroup/PELT overhaul
 (again)..

Hello,

On Fri, May 12, 2017 at 06:44:16PM +0200, Peter Zijlstra wrote:
> 
> Hi all,
> 
> So after staring at all that PELT stuff and working my way through it again:
> 
>   https://lkml.kernel.org/r/20170505154117.6zldxuki2fgyo53n@hirez.programming.kicks-ass.net
> 
> I started doing some patches to fix some of the identified broken.
> 
> So here are a few too many patches that do:
> 
>  - fix 'reweight_entity' to instantly propagate the change in se->load.weight.
> 
>  - rewrite/fix the propagate on migrate (attach/detach)
> 
>  - introduce the hierarchical runnable_load_avg, as proposed by Tejun.
> 
>  - synchronous detach for runnable migrates
> 
>  - aligns the PELT windows between a cfs_rq and all its se's
> 
>  - deals with random fallout from the above (some of this needs folding back
>    and reordering, but its all well past the point I should post this anyway).

The schbench results look good here.  I'll put it under more realistic
test tomorrow and see how it performs.

Thanks.

-- 
tejun