linux-kernel - Re: [PATCH -tip 04/32] sched: Core-wide rq->lock

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Message-ID: <20201122091152.GB110669@balbir-desktop>
Date:   Sun, 22 Nov 2020 20:11:52 +1100
From:   Balbir Singh <bsingharora@...il.com>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     Nishanth Aravamudan <naravamudan@...italocean.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Aaron Lu <aaron.lwe@...il.com>,
        Aubrey Li <aubrey.intel@...il.com>, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        torvalds@...ux-foundation.org, fweisbec@...il.com,
        keescook@...omium.org, 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, dfaggioli@...e.com,
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        Alexandre Chartre <alexandre.chartre@...cle.com>,
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        Dhaval Giani <dhaval.giani@...cle.com>,
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        chris.hyser@...cle.com, Ben Segall <bsegall@...gle.com>,
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        Tom Lendacky <thomas.lendacky@....com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Tim Chen <tim.c.chen@...el.com>
Subject: Re: [PATCH -tip 04/32] sched: Core-wide rq->lock

On Tue, Nov 17, 2020 at 06:19:34PM -0500, Joel Fernandes (Google) wrote:
> From: Peter Zijlstra <peterz@...radead.org>
> 
> Introduce the basic infrastructure to have a core wide rq->lock.
>

Reading through the patch, it seems like all the CPUs have to be
running with sched core enabled/disabled? Is it possible to have some
cores with core sched disabled? I don't see a strong use case for it,
but I am wondering if the design will fall apart if that assumption is
broken?

Balbir Singh