cpufreq: stats: Use local_clock() instead of jiffies

local_clock() has better precision and accuracy as compared to jiffies,
lets use it for time management in cpufreq stats.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 6cd5c8a..da717f7 100644 (file)
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -9,9 +9,9 @@
 #include <linux/cpu.h>
 #include <linux/cpufreq.h>
 #include <linux/module.h>
+#include <linux/sched/clock.h>
 #include <linux/slab.h>
 
-
 struct cpufreq_stats {
        unsigned int total_trans;
        unsigned long long last_time;
@@ -30,7 +30,7 @@ struct cpufreq_stats {
 static void cpufreq_stats_update(struct cpufreq_stats *stats,
                                 unsigned long long time)
 {
-       unsigned long long cur_time = get_jiffies_64();
+       unsigned long long cur_time = local_clock();
 
        stats->time_in_state[stats->last_index] += cur_time - time;
        stats->last_time = cur_time;
@@ -42,7 +42,7 @@ static void cpufreq_stats_reset_table(struct cpufreq_stats *stats)
 
        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->last_time = local_clock();
        stats->total_trans = 0;
 
        /* Adjust for the time elapsed since reset was requested */
@@ -82,18 +82,18 @@ static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
                                 * before the reset_pending read above.
                                 */
                                smp_rmb();
-                               time = get_jiffies_64() - READ_ONCE(stats->reset_time);
+                               time = local_clock() - READ_ONCE(stats->reset_time);
                        } else {
                                time = 0;
                        }
                } else {
                        time = stats->time_in_state[i];
                        if (i == stats->last_index)
-                               time += get_jiffies_64() - stats->last_time;
+                               time += local_clock() - stats->last_time;
                }
 
                len += sprintf(buf + len, "%u %llu\n", stats->freq_table[i],
-                              jiffies_64_to_clock_t(time));
+                              nsec_to_clock_t(time));
        }
        return len;
 }
@@ -109,7 +109,7 @@ static ssize_t store_reset(struct cpufreq_policy *policy, const char *buf,
         * Defer resetting of stats to cpufreq_stats_record_transition() to
         * avoid races.
         */
-       WRITE_ONCE(stats->reset_time, get_jiffies_64());
+       WRITE_ONCE(stats->reset_time, local_clock());
        /*
         * The memory barrier below is to prevent the readers of reset_time from
         * seeing a stale or partially updated value.
@@ -249,7 +249,7 @@ void cpufreq_stats_create_table(struct cpufreq_policy *policy)
                        stats->freq_table[i++] = pos->frequency;
 
        stats->state_num = i;
-       stats->last_time = get_jiffies_64();
+       stats->last_time = local_clock();
        stats->last_index = freq_table_get_index(stats, policy->cur);
 
        policy->stats = stats;