linux-kernel - Re: [PATCH -tip 23/32] sched: Add a per-thread core scheduling interface

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Message-ID: <796ec1e5-15ef-34da-5716-0ec19432deba@oracle.com>
Date:   Tue, 15 Dec 2020 10:13:20 -0800
From:   Dhaval Giani <dhaval.giani@...cle.com>
To:     Joel Fernandes <joel@...lfernandes.org>,
        chris hyser <chris.hyser@...cle.com>
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, 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,
        pjt@...gle.com, rostedt@...dmis.org, derkling@...gle.com,
        benbjiang@...cent.com,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        James.Bottomley@...senpartnership.com, OWeisse@...ch.edu,
        Junaid Shahid <junaids@...gle.com>, jsbarnes@...gle.com,
        Ben Segall <bsegall@...gle.com>, Josh Don <joshdon@...gle.com>,
        Hao Luo <haoluo@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Tim Chen <tim.c.chen@...el.com>
Subject: Re: [PATCH -tip 23/32] sched: Add a per-thread core scheduling
 interface

On 12/14/20 3:25 PM, Joel Fernandes wrote:

>> No problem. That was there primarily for debugging.
> Ok. I squashed Josh's changes into this patch and several of my fixups. So
> there'll be 3 patches:
> 1. CGroup + prctl  (single patch as it is hell to split it)

Please don't do that. I am not sure we have thought the cgroup interface through
(looking at all the discussions). IMHO, it would be better for us to get a simpler
interface (prctl) right and then once we learn the lessons using it, apply it for
the cgroup interface. I think we all agree we don't want to maintain a messy interface
forever.

Dhaval