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

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Message-ID: <ca34288c-f7c5-e722-2d05-0fbde74b2bda@linux.microsoft.com>
Date:   Fri, 28 Aug 2020 18:15:00 -0400
From:   Vineeth Pillai <viremana@...ux.microsoft.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Julien Desfossez <jdesfossez@...italocean.com>
Cc:     Joel Fernandes <joelaf@...gle.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>,
        mingo@...nel.org, tglx@...utronix.de, pjt@...gle.com,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.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>, joel@...lfernandes.org,
        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,
        rostedt@...dmis.org, derkling@...gle.com, benbjiang@...cent.com,
        Vineeth Remanan Pillai <vpillai@...italocean.com>,
        Aaron Lu <aaron.lu@...ux.alibaba.com>
Subject: Re: [RFC PATCH v7 08/23] sched: Add core wide task selection and
 scheduling.



On 8/28/20 4:55 PM, Peter Zijlstra wrote:
> On Fri, Aug 28, 2020 at 03:51:09PM -0400, Julien Desfossez wrote:
>> +		if (is_idle_task(rq_i->core_pick) && rq_i->nr_running)
>> +			rq_i->core_forceidle = true;
> Did you mean: rq_i->core_pick == rq_i->idle ?
>
> is_idle_task() will also match idle-injection threads, which I'm not
> sure we want here.
Thanks for catching this. You are right, we should be checking for
rq_i->idle. There are couple other places where we use is_idle_task.
Will go through them and verify if we need to fix there as well.

Thanks,
Vineeth