linux-kernel - Re: [PATCH V2 2/2] Cpufreq/gov: use tick_nohz_check() to check idle micro accouting support

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Message-ID: <CAKohpo=Nr7upLoRT5P1wADGtvEgZp_gEpsW8=HrYb=QP31rbBg@mail.gmail.com>
Date:	Fri, 15 Nov 2013 16:06:10 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Lan Tianyu <tianyu.lan@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"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 2/2] Cpufreq/gov: use tick_nohz_check() to check idle
 micro accouting support

On 15 November 2013 14:05, Lan Tianyu <tianyu.lan@...el.com> wrote:
> Current, od_init() uses get_cpu_idle_time_us() to check whether
> idle micro accouting is supported. The get_cpu_idle_time_us()
> returns -1 only when tick nohz is disabled. This patch is to use
> tick_nohz_check() directly to check nohz enable status instead of
> get_cpu_idle_time_us(). This can avoid unnecessary getting and
> putting cpu.
>
> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
> ---
>  drivers/cpufreq/cpufreq_ondemand.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)

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