linux-kernel - Re: [PATCH 01/23] sched: Provide sched_set

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Message-ID: <20200422164030.GA17661@paulmck-ThinkPad-P72>
Date:   Wed, 22 Apr 2020 09:40:30 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        qais.yousef@....com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, airlied@...hat.com,
        alexander.deucher@....com, awalls@...metrocast.net,
        axboe@...nel.dk, broonie@...nel.org, daniel.lezcano@...aro.org,
        gregkh@...uxfoundation.org, hannes@...xchg.org,
        herbert@...dor.apana.org.au, hverkuil@...all.nl,
        john.stultz@...aro.org, nico@...xnic.net,
        rafael.j.wysocki@...el.com, rmk+kernel@....linux.org.uk,
        sudeep.holla@....com, ulf.hansson@...aro.org,
        wim@...ux-watchdog.org
Subject: Re: [PATCH 01/23] sched: Provide sched_set_fifo()

On Wed, Apr 22, 2020 at 12:33:31PM -0400, Steven Rostedt wrote:
> On Wed, 22 Apr 2020 08:50:06 -0700
> "Paul E. McKenney" <paulmck@...nel.org> wrote:
> 
> > Indeed, an extreme form of insanity would be required to try to make core
> > RCU be a module.  Not that such a form of insanity is a bad thing in and
> > of itself, but it might best be directed towards less futile ventures.  ;-)
> 
> That's like making the core of mutexes a module. How would that ever work
> (without becoming a microkernel).

Someone somewhere has probably done it.  Perhaps you really could make
mutexes be a module within the Linux kernel using kpatch or similar.
Sort of, anyway.

Not saying it is not insane, mind you!  ;-)

							Thanx, Paul