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cpufreq: stats: New sysfs attribute for clearing statistics
Allow CPUfreq statistics to be cleared by writing anything to /sys/.../cpufreq/stats/reset. Signed-off-by: Markus Mayer <mmayer@broadcom.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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3 changed files with 32 additions and 0 deletions
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@ -44,11 +44,17 @@ the stats driver insertion.
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total 0
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total 0
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drwxr-xr-x 2 root root 0 May 14 16:06 .
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drwxr-xr-x 2 root root 0 May 14 16:06 .
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drwxr-xr-x 3 root root 0 May 14 15:58 ..
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drwxr-xr-x 3 root root 0 May 14 15:58 ..
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--w------- 1 root root 4096 May 14 16:06 reset
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-r--r--r-- 1 root root 4096 May 14 16:06 time_in_state
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-r--r--r-- 1 root root 4096 May 14 16:06 time_in_state
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-r--r--r-- 1 root root 4096 May 14 16:06 total_trans
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-r--r--r-- 1 root root 4096 May 14 16:06 total_trans
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-r--r--r-- 1 root root 4096 May 14 16:06 trans_table
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-r--r--r-- 1 root root 4096 May 14 16:06 trans_table
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--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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- reset
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Write-only attribute that can be used to reset the stat counters. This can be
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useful for evaluating system behaviour under different governors without the
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need for a reboot.
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- time_in_state
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- time_in_state
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This gives the amount of time spent in each of the frequencies supported by
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This gives the amount of time spent in each of the frequencies supported by
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this CPU. The cat output will have "<frequency> <time>" pair in each line, which
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this CPU. The cat output will have "<frequency> <time>" pair in each line, which
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@ -41,6 +41,18 @@ static int cpufreq_stats_update(struct cpufreq_stats *stats)
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return 0;
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return 0;
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}
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}
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static void cpufreq_stats_clear_table(struct cpufreq_stats *stats)
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{
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unsigned int count = stats->max_state;
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memset(stats->time_in_state, 0, count * sizeof(u64));
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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memset(stats->trans_table, 0, count * count * sizeof(int));
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#endif
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stats->last_time = get_jiffies_64();
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stats->total_trans = 0;
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}
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static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
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static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
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{
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{
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return sprintf(buf, "%d\n", policy->stats->total_trans);
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return sprintf(buf, "%d\n", policy->stats->total_trans);
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@ -64,6 +76,14 @@ static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
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return len;
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return len;
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}
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}
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static ssize_t store_reset(struct cpufreq_policy *policy, const char *buf,
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size_t count)
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{
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/* We don't care what is written to the attribute. */
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cpufreq_stats_clear_table(policy->stats);
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return count;
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}
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
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static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
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{
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{
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@ -113,10 +133,12 @@ cpufreq_freq_attr_ro(trans_table);
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cpufreq_freq_attr_ro(total_trans);
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cpufreq_freq_attr_ro(total_trans);
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cpufreq_freq_attr_ro(time_in_state);
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cpufreq_freq_attr_ro(time_in_state);
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cpufreq_freq_attr_wo(reset);
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static struct attribute *default_attrs[] = {
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static struct attribute *default_attrs[] = {
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&total_trans.attr,
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&total_trans.attr,
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&time_in_state.attr,
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&time_in_state.attr,
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&reset.attr,
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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&trans_table.attr,
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&trans_table.attr,
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#endif
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#endif
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@ -234,6 +234,10 @@ __ATTR(_name, _perm, show_##_name, NULL)
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static struct freq_attr _name = \
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static struct freq_attr _name = \
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__ATTR(_name, 0644, show_##_name, store_##_name)
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__ATTR(_name, 0644, show_##_name, store_##_name)
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#define cpufreq_freq_attr_wo(_name) \
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static struct freq_attr _name = \
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__ATTR(_name, 0200, NULL, store_##_name)
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struct global_attr {
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struct global_attr {
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struct attribute attr;
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struct attribute attr;
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ssize_t (*show)(struct kobject *kobj,
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ssize_t (*show)(struct kobject *kobj,
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