linux-kernel - Re: [PATCH rcu 0/4] Refactor TASKS

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Message-ID: <Zdh5ZIboTTQJjG1i@FVFF77S0Q05N>
Date: Fri, 23 Feb 2024 10:54:28 +0000
From: Mark Rutland <mark.rutland@....com>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: rcu@...r.kernel.org, linux-kernel@...r.kernel.org, kernel-team@...a.com,
	rostedt@...dmis.org, ankur.a.arora@...cle.com, tglx@...utronix.de
Subject: Re: [PATCH rcu 0/4] Refactor TASKS_RCU for lazy preemption

On Thu, Feb 22, 2024 at 04:26:18PM -0800, Paul E. McKenney wrote:
> Hello!

Hi!

> This series refactors the NEED_TASKS_RCU option so that the conditional
> processing is in one place in kernel/rcu/Kconfig.  This makes it easier
> to make sure that Tasks RCU is enabled in PREEMPT_AUTO kernels, given
> that such kernels are preemptible, even if only lazily so.  After all,
> it takes only one lazy preemption from a trampoline to significantly
> degrade your kernel's actuarial statistics.
> 
> 1.	Create NEED_TASKS_RCU to factor out enablement logic.
> 
> 2.	Select new NEED_TASKS_RCU Kconfig option.
> 
> 3.	Select new NEED_TASKS_RCU Kconfig option.
> 
> 4.	Select new NEED_TASKS_RCU Kconfig option.

For the series:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.