linux-kernel - Re: [PATCH 1/2] cpustat: use accessor functions for get/set/add

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Date:	Fri, 22 Feb 2013 11:51:43 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Kevin Hilman <khilman@...aro.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [PATCH 1/2] cpustat: use accessor functions for get/set/add

On Fri, Feb 22, 2013 at 11:26 AM, Kevin Hilman <khilman@...aro.org> wrote:
> Add some accessor functions in order to facilitate the conversion to
> atomic reads/writes of cpustat values.
>
> Signed-off-by: Kevin Hilman <khilman@...aro.org>
> ---
>  drivers/cpufreq/cpufreq_governor.c | 18 ++++++++---------
>  drivers/cpufreq/cpufreq_ondemand.c |  2 +-

> diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
> index 6c5f1d3..ec6c315 100644
> --- a/drivers/cpufreq/cpufreq_governor.c
> +++ b/drivers/cpufreq/cpufreq_governor.c
> @@ -36,12 +36,12 @@ static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
>
>         cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
>
> -       busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
> -       busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
> -       busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
> -       busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
> -       busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
> -       busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
> +       busy_time = kcpustat_cpu_get(cpu, CPUTIME_USER);
> +       busy_time += kcpustat_cpu_get(cpu, CPUTIME_SYSTEM);
> +       busy_time += kcpustat_cpu_get(cpu, CPUTIME_IRQ);
> +       busy_time += kcpustat_cpu_get(cpu, CPUTIME_SOFTIRQ);
> +       busy_time += kcpustat_cpu_get(cpu, CPUTIME_STEAL);
> +       busy_time += kcpustat_cpu_get(cpu, CPUTIME_NICE);
>
>         idle_time = cur_wall_time - busy_time;
>         if (wall)
> @@ -103,7 +103,7 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
>                         u64 cur_nice;
>                         unsigned long cur_nice_jiffies;
>
> -                       cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] -
> +                       cur_nice = kcpustat_cpu_get(j, CPUTIME_NICE) -
>                                          cdbs->prev_cpu_nice;
>                         /*
>                          * Assumption: nice time between sampling periods will
> @@ -113,7 +113,7 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
>                                         cputime64_to_jiffies64(cur_nice);
>
>                         cdbs->prev_cpu_nice =
> -                               kcpustat_cpu(j).cpustat[CPUTIME_NICE];
> +                               kcpustat_cpu_get(j, CPUTIME_NICE);
>                         idle_time += jiffies_to_usecs(cur_nice_jiffies);
>                 }
>
> @@ -216,7 +216,7 @@ int cpufreq_governor_dbs(struct dbs_data *dbs_data,
>                                         &j_cdbs->prev_cpu_wall);
>                         if (ignore_nice)
>                                 j_cdbs->prev_cpu_nice =
> -                                       kcpustat_cpu(j).cpustat[CPUTIME_NICE];
> +                                       kcpustat_cpu_get(j, CPUTIME_NICE);
>                 }
>
>                 /*
> diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
> index 7731f7c..ac5d49f 100644
> --- a/drivers/cpufreq/cpufreq_ondemand.c
> +++ b/drivers/cpufreq/cpufreq_ondemand.c
> @@ -403,7 +403,7 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
>                                                 &dbs_info->cdbs.prev_cpu_wall);
>                 if (od_tuners.ignore_nice)
>                         dbs_info->cdbs.prev_cpu_nice =
> -                               kcpustat_cpu(j).cpustat[CPUTIME_NICE];
> +                               kcpustat_cpu_get(j, CPUTIME_NICE);
>
>         }
>         return count;

For cpufreq:

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

Though i believe you also need this:

diff --git a/drivers/cpufreq/cpufreq_conservative.c
b/drivers/cpufreq/cpufreq_conservative.c
index 64ef737..38e3ad7 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -242,7 +242,7 @@ static ssize_t store_ignore_nice_load(struct
kobject *a, struct attribute *b,
                                                &dbs_info->cdbs.prev_cpu_wall);
                if (cs_tuners.ignore_nice)
                        dbs_info->cdbs.prev_cpu_nice =
-                               kcpustat_cpu(j).cpustat[CPUTIME_NICE];
+                               kcpustat_cpu_get(j, CPUTIME_NICE);
        }
        return count;
 }

BTW, i don't see kcpustat_cpu() used in

 kernel/sched/core.c                | 12 +++++-------
 kernel/sched/cputime.c             | 29 +++++++++++++--------------

I searched tip/master as well as lnext/master.
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