linux-kernel - Re: [RFC PATCH] kernel: allow to configure PREEMPT_NONE, PREEMPT

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Message-ID: <20201009101431.GJ2628@hirez.programming.kicks-ass.net>
Date:   Fri, 9 Oct 2020 12:14:31 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Frederic Weisbecker <fweisbecker@...e.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC PATCH] kernel: allow to configure PREEMPT_NONE,
 PREEMPT_VOLUNTARY on kernel command line

On Fri, Oct 09, 2020 at 12:10:44PM +0200, Michal Hocko wrote:
> On Fri 09-10-20 11:42:45, Peter Zijlstra wrote:
> > On Fri, Oct 09, 2020 at 11:12:18AM +0200, Michal Hocko wrote:
> > > Is there any additional feedback? Should I split up the patch and repost
> > > for inclusion?
> > 
> > Maybe remove PREEMPT_NONE after that?  Since that's then equivalent to
> > building with VOLUNTARY and booting with preempt=none.
> 
> So do you mean that I should post an additional patch which does this on
> top? With a justification that there is one option less to chose from?

Exactly!