linux-kernel - Re: [patch 4/5] posix-cpu-timers: Defer timer handling to task

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Date:   Thu, 1 Aug 2019 16:51:16 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Ingo Molnar <mingo@...nel.org>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Julia Cartwright <julia@...com>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        John Stultz <john.stultz@...aro.org>,
        Andy Lutomirski <luto@...nel.org>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Oleg Nesterov <oleg@...hat.com>, kvm@...r.kernel.org,
        Radim Krcmar <rkrcmar@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [patch 4/5] posix-cpu-timers: Defer timer handling to task_work

On Thu, Aug 01, 2019 at 04:32:54PM +0200, Thomas Gleixner wrote:
> --- a/kernel/time/Kconfig
> +++ b/kernel/time/Kconfig
> @@ -52,6 +52,11 @@ config GENERIC_CLOCKEVENTS_MIN_ADJUST
>  config GENERIC_CMOS_UPDATE
>  	bool
>  
> +# Select to handle posix CPU timers from task_work
> +# and not from the timer interrupt context
> +config POSIX_CPU_TIMERS_TASK_WORK
> +	bool
> +
>  if GENERIC_CLOCKEVENTS
>  menu "Timers subsystem"
>  


diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index deff97217496..76e37ad5bc31 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -58,6 +58,7 @@ config PREEMPT
 config PREEMPT_RT
 	bool "Fully Preemptible Kernel (Real-Time)"
 	depends on EXPERT && ARCH_SUPPORTS_RT
+	depends on POSIX_CPU_TIMERS_TASK_WORK
 	select PREEMPTION
 	help
 	  This option turns the kernel into a real-time kernel by replacing