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