linux-kernel - Re: [RFC PATCH v3 00/16] Core scheduling v3

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Date:   Tue, 23 Jul 2019 10:52:07 +0800
From:   Aubrey Li <aubrey.intel@...il.com>
To:     Aaron Lu <aaron.lu@...ux.alibaba.com>
Cc:     Julien Desfossez <jdesfossez@...italocean.com>,
        Subhra Mazumdar <subhra.mazumdar@...cle.com>,
        Vineeth Remanan Pillai <vpillai@...italocean.com>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Turner <pjt@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kerr <kerrnel@...gle.com>, Phil Auld <pauld@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC PATCH v3 00/16] Core scheduling v3

On Mon, Jul 22, 2019 at 6:43 PM Aaron Lu <aaron.lu@...ux.alibaba.com> wrote:
>
> On 2019/7/22 18:26, Aubrey Li wrote:
> > The granularity period of util_avg seems too large to decide task priority
> > during pick_task(), at least it is in my case, cfs_prio_less() always picked
> > core max task, so pick_task() eventually picked idle, which causes this change
> > not very helpful for my case.
> >
> >  <idle>-0     [057] dN..    83.716973: __schedule: max: sysbench/2578
> > ffff889050f68600
> >  <idle>-0     [057] dN..    83.716974: __schedule:
> > (swapper/5/0;140,0,0) ?< (mysqld/2511;119,1042118143,0)
> >  <idle>-0     [057] dN..    83.716975: __schedule:
> > (sysbench/2578;119,96449836,0) ?< (mysqld/2511;119,1042118143,0)
> >  <idle>-0     [057] dN..    83.716975: cfs_prio_less: picked
> > sysbench/2578 util_avg: 20 527 -507 <======= here===
> >  <idle>-0     [057] dN..    83.716976: __schedule: pick_task cookie
> > pick swapper/5/0 ffff889050f68600
>
> Can you share your setup of the test? I would like to try it locally.

My setup is a co-location of AVX512 tasks(gemmbench) and non-AVX512 tasks
(sysbench MYSQL). Let me simply it and send offline.

Thanks,
-Aubrey