linux-kernel - Re: [PATCH V2 1/2] Tick: Introduce tick_nohz

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Message-ID: <CAKohpomwb4iAaBkHd=N_UqWJUemCZ_QnYTy=sUDsJ0nerjz9rw@mail.gmail.com>
Date:	Fri, 15 Nov 2013 16:05:58 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Lan Tianyu <tianyu.lan@...el.com>
Cc:	dipankar@...ibm.com, Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 1/2] Tick: Introduce tick_nohz_check() to check nohz
 enable status

On 15 November 2013 14:05, Lan Tianyu <tianyu.lan@...el.com> wrote:
> In some cases, nohz enable status needs to be checked. E.G, in RCU and cpufreq
> ondemand governor. So add tick_nohz_check() to return tick_nohz_enabled value
> And use tick_nohz_check() instead of referencing tick_nohz_enabled in the rcutree_plugin.h.
>
> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
> ---
>
> Change since V2:
>         Add ACCESS_ONCE to tick_nohz_check().
>
>  include/linux/tick.h     | 2 ++
>  kernel/rcutree_plugin.h  | 4 +---
>  kernel/time/tick-sched.c | 8 +++++++-
>  3 files changed, 10 insertions(+), 4 deletions(-)

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
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