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

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Message-ID: <20201007122144.GF2628@hirez.programming.kicks-ass.net>
Date:   Wed, 7 Oct 2020 14:21:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Michal Hocko <mhocko@...nel.org>
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>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [RFC PATCH] kernel: allow to configure PREEMPT_NONE,
 PREEMPT_VOLUNTARY on kernel command line

On Wed, Oct 07, 2020 at 02:04:01PM +0200, Michal Hocko wrote:
> I wanted to make sure that the idea is sound for maintainers first. The
> next step would be extending the command line to support full preemption
> as well but there is much more work in that area. Frederic has promissed
> to look into that.

The sanest way there is to static_call() __preempt_schedule() I think.
Alternatively you could use alternatives but that makes the whole thing
arch specific again.