linux-kernel - Re: [RFC PATCH v7 08/23] sched: Add core wide task selection and scheduling.

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Date:   Tue, 1 Sep 2020 21:11:18 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Vineeth Pillai <viremana@...ux.microsoft.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Aaron Lu <aaron.lwe@...il.com>,
        Aubrey Li <aubrey.intel@...il.com>,
        Dhaval Giani <dhaval.giani@...cle.com>,
        Chris Hyser <chris.hyser@...cle.com>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Glexiner <tglx@...utronix.de>,
        Paul Turner <pjt@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Frederic 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>, vineeth@...byteword.org,
        Chen Yu <yu.c.chen@...el.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Agata Gruza <agata.gruza@...el.com>,
        Antonio Gomez Iglesias <antonio.gomez.iglesias@...el.com>,
        graf@...zon.com, konrad.wilk@...cle.com,
        Dario Faggioli <dfaggioli@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Patrick Bellasi <derkling@...gle.com>,
        benbjiang(蒋彪) <benbjiang@...cent.com>,
        Aaron Lu <aaron.lu@...ux.alibaba.com>
Subject: Re: [RFC PATCH v7 08/23] sched: Add core wide task selection and scheduling.

On Tue, Sep 1, 2020 at 5:23 PM Vineeth Pillai
<viremana@...ux.microsoft.com> wrote:
> > Also, Peter said pick_seq is for core-wide picking. If you want to add
> > another semantic, then maybe add another counter which has a separate
> > meaning and justify why you are adding it.
> I think just one counter is enough. Unless, there is a need to keep the
> counter
> to track core wide pick, I feel it is worth to change the design and
> make the
> counter serve its purpose. Will think through this and send it as a separate
> patch if needed.

Since you agree that it suffices to set core_pick to NULL if you don't
IPI a sibling, I don't see the need for your split pick_seq thing.
But let me know if I missed something.

thanks,

 - Joel