linux-kernel - Re: [PATCH resend 2/8] sched: core scheduling tagging infrastructure

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Message-ID: <YGGkDHWQkYLyrVJW@hirez.programming.kicks-ass.net>
Date:   Mon, 29 Mar 2021 11:55:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Don <joshdon@...gle.com>
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        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 Gleixner <tglx@...utronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>, torvalds@...ux-foundation.org,
        fweisbec@...il.com, Kees Cook <keescook@...omium.org>,
        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,
        Steven Rostedt <rostedt@...dmis.org>, benbjiang@...cent.com,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        James.Bottomley@...senpartnership.com, OWeisse@...ch.edu,
        Dhaval Giani <dhaval.giani@...cle.com>,
        "Hyser,Chris" <chris.hyser@...cle.com>,
        Hao Luo <haoluo@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>, dhiatt@...italocean.com
Subject: Re: [PATCH resend 2/8] sched: core scheduling tagging infrastructure

On Fri, Mar 26, 2021 at 08:19:57PM -0700, Josh Don wrote:
> On Fri, Mar 26, 2021 at 5:10 PM Peter Zijlstra <peterz@...radead.org> wrote:

> > I've spend the past few hours rewriting patches #2 and #3, and adapting
> > #4. The thing was working before I added SHARE_FROM back and introduced
> > GET, but now I'm seeing a few FAILs from the selftest.
> >
> > I'm too tired to make sense of anything much, or even focus my eyes
> > consistently, so I'll have to prod at it some more next week, but I've
> > pushed out the lot to my queue.git:
> >
> >   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/log/?h=sched/core-sched
> 
> Thanks, I'll take a look next week.

OK, fixed the fails. My tired head made it unconditionally return the
cookie-id of 'current' instead of task. Pushed out an update.

> > Also, we really need a better name than coretag.c.
> 
> Yea, we don't really otherwise use the phrase "tagging". core_sched.c
> is probably too confusing given we have sched/core.c.

Right, so I tried core_sched and my fingers already hate it as much as
kernel/scftorture.c (which I'd assumed my fingers would get used to
eventually, but noooo).

Looking at kernel/sched/ C is very overrepresented, so we really don't
want another I think. B, E, G, H, J, K, N, seem to still be available in
the first half of the alphabet. Maybe, bonghits.c, gabbleduck.c ?