linux-kernel - Re: [PATCH v2 13/35] sched: allow runtime config for PREEMPT

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Date: Thu, 30 May 2024 02:29:45 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Ankur Arora <ankur.a.arora@...cle.com>, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, torvalds@...ux-foundation.org, paulmck@...nel.org,
        rostedt@...dmis.org, mark.rutland@....com, juri.lelli@...hat.com,
        joel@...lfernandes.org, raghavendra.kt@....com, sshegde@...ux.ibm.com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        Ingo Molnar
 <mingo@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH v2 13/35] sched: allow runtime config for PREEMPT_AUTO


Peter Zijlstra <peterz@...radead.org> writes:

> On Mon, May 27, 2024 at 05:34:59PM -0700, Ankur Arora wrote:
>> Reuse sched_dynamic_update() and related logic to enable choosing
>> the preemption model at boot or runtime for PREEMPT_AUTO.
>>
>> The interface is identical to PREEMPT_DYNAMIC.
>
> Colour me confused, why?!? What are you doing and why aren't just just
> adding AUTO to the existing DYNAMIC thing?

You mean have a single __sched_dynamic_update()? AUTO doesn't use any
of the static_call/static_key stuff so I'm not sure how that would work.

Or am I missing the point of what you are saying?

--
ankur