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cpufreq: stats: Use lock by stat to replace global spin lock 

Stats is updated by each policy, using the lock by stat can
reduce the contention.

Signed-off-by: Kyle Lin <linkyle0915@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Kyle Lin 2019-04-09 16:43:04 +08:00 committed by Rafael J. Wysocki
parent 89f98d7e5f
commit fcccc5c838
1 changed files with 8 additions and 7 deletions
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15
drivers/cpufreq/cpufreq_stats.c
View File

@ -14,7 +14,6 @@
#include <linux/module.h>
#include <linux/slab.h>
static DEFINE_SPINLOCK(cpufreq_stats_lock);
struct cpufreq_stats {
unsigned int total_trans;
@ -23,6 +22,7 @@ struct cpufreq_stats {
unsigned int state_num;
unsigned int last_index;
u64 *time_in_state;
spinlock_t lock;
unsigned int *freq_table;
unsigned int *trans_table;
};
@ -39,12 +39,12 @@ static void cpufreq_stats_clear_table(struct cpufreq_stats *stats)
{
unsigned int count = stats->max_state;
spin_lock(&cpufreq_stats_lock);
spin_lock(&stats->lock);
memset(stats->time_in_state, 0, count * sizeof(u64));
memset(stats->trans_table, 0, count * count * sizeof(int));
stats->last_time = get_jiffies_64();
stats->total_trans = 0;
spin_unlock(&cpufreq_stats_lock);
spin_unlock(&stats->lock);
}
static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
@ -62,9 +62,9 @@ static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
if (policy->fast_switch_enabled)
return 0;
spin_lock(&cpufreq_stats_lock);
spin_lock(&stats->lock);
cpufreq_stats_update(stats);
spin_unlock(&cpufreq_stats_lock);
spin_unlock(&stats->lock);
for (i = 0; i < stats->state_num; i++) {
len += sprintf(buf + len, "%u %llu\n", stats->freq_table[i],
@ -211,6 +211,7 @@ void cpufreq_stats_create_table(struct cpufreq_policy *policy)
stats->state_num = i;
stats->last_time = get_jiffies_64();
stats->last_index = freq_table_get_index(stats, policy->cur);
spin_lock_init(&stats->lock);
policy->stats = stats;
ret = sysfs_create_group(&policy->kobj, &stats_attr_group);
@ -242,11 +243,11 @@ void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
if (old_index == -1 || new_index == -1 || old_index == new_index)
return;
spin_lock(&cpufreq_stats_lock);
spin_lock(&stats->lock);
cpufreq_stats_update(stats);
stats->last_index = new_index;
stats->trans_table[old_index * stats->max_state + new_index]++;
stats->total_trans++;
spin_unlock(&cpufreq_stats_lock);
spin_unlock(&stats->lock);
}