linux-kernel - Re: [PATCH v8 -tip 08/26] sched/fair: Snapshot the min

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Message-ID: <20201030084112.GX2628@hirez.programming.kicks-ass.net>
Date:   Fri, 30 Oct 2020 09:41:12 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Nishanth Aravamudan <naravamudan@...italocean.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        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>,
        Thomas Glexiner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        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>,
        Paul Turner <pjt@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Patrick Bellasi <derkling@...gle.com>,
        benbjiang(蒋彪) <benbjiang@...cent.com>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        James.Bottomley@...senpartnership.com, OWeisse@...ch.edu,
        Dhaval Giani <dhaval.giani@...cle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Jesse Barnes <jsbarnes@...gle.com>,
        "Hyser,Chris" <chris.hyser@...cle.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Tim Chen <tim.c.chen@...el.com>
Subject: Re: [PATCH v8 -tip 08/26] sched/fair: Snapshot the min_vruntime of
 CPUs on force idle

On Thu, Oct 29, 2020 at 10:42:29PM -0400, Joel Fernandes wrote:

> Forgot to ask, do you also need to do the task_vruntime_update() for
> the unconstrained pick?

Humm.. interesting case.

Yes, however... since in that case the picks aren't synchronized it's a
wee bit dodgy. I'll throw it on the pile together with SMT4.


Also, I'm still hoping you can make this form work:

  https://lkml.kernel.org/r/20201026093131.GF2628@hirez.programming.kicks-ass.net

(note that the put_prev_task() needs an additional rq argument)

That's both simpler code and faster.