linux-kernel - Re: [PATCH 4/5] nohz: Move full nohz kick to its own IPI

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Message-ID: <20140603150054.GU30445@twins.programming.kicks-ass.net>
Date:	Tue, 3 Jun 2014 17:00:54 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kevin Hilman <khilman@...aro.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH 4/5] nohz: Move full nohz kick to its own IPI

On Tue, Jun 03, 2014 at 04:40:19PM +0200, Frederic Weisbecker wrote:
> Now that the irq work subsystem can queue remote callbacks, it's
> a perfect fit to safely queue IPIs when interrupts are disabled
> without worrying about concurrent callers.
> 
> Lets use it for the full dynticks kick to notify a CPU that it's
> exiting single task mode.
> 
> This unbloats a bit the scheduler IPI that the nohz code was abusing
> for its cool "callable anywhere/anytime" properties.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Kevin Hilman <khilman@...aro.org>
> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> ---
>  include/linux/tick.h     |  9 ++++++++-
>  kernel/sched/core.c      |  5 +----
>  kernel/sched/sched.h     |  2 +-
>  kernel/time/tick-sched.c | 10 ++++++----
>  4 files changed, 16 insertions(+), 10 deletions(-)
> 

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