linux-kernel - Re: [PATCH linux-pm] cpufreq: governors: Fix calculation of wall time in get_cpu_idle

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Date:	Fri, 22 Mar 2013 17:09:51 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Stratos Karafotis <stratosk@...aphore.gr>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH linux-pm] cpufreq: governors: Fix calculation of wall time
 in get_cpu_idle_time

On Fri, Mar 22, 2013 at 12:46 PM, Stratos Karafotis
<stratosk@...aphore.gr> wrote:
> With commit 8755a8ae31ba213db196324011a0da2a85807f25 the wall in
> get_cpu_idle_time is not calculated, when we use ondemand with
> io_is_busy = 1, preventing the CPU to increase to max frequency.
>
> Properly, calculate wall time when we use io_is_busy.
>
> Signed-off-by: Stratos Karafotis <stratosk@...aphore.gr>
> ---
>  drivers/cpufreq/cpufreq_governor.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
> index b49d45d..41e5e56 100644
> --- a/drivers/cpufreq/cpufreq_governor.c
> +++ b/drivers/cpufreq/cpufreq_governor.c
> @@ -53,7 +53,7 @@ static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
>
>  u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy)
>  {
> -       u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
> +       u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL);
>
>         if (idle_time == -1ULL)
>                 return get_cpu_idle_time_jiffy(cpu, wall);

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