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author | Viresh Kumar <viresh.kumar@linaro.org> | 2020-11-17 17:02:10 +0530 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-12-11 19:53:58 +0100 |
commit | 7854c7520b86f0c14f7fcfea6fd1785617844341 (patch) | |
tree | 5d8c4405decbd00d868a2eac436f42e31dc2fefb /drivers/cpufreq/cpufreq_stats.c | |
parent | 90ac908a418b836427d6eaf84fbc5062881747fd (diff) | |
download | linux-7854c7520b86f0c14f7fcfea6fd1785617844341.tar.gz linux-7854c7520b86f0c14f7fcfea6fd1785617844341.tar.bz2 linux-7854c7520b86f0c14f7fcfea6fd1785617844341.zip |
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>
Diffstat (limited to 'drivers/cpufreq/cpufreq_stats.c')
-rw-r--r-- | drivers/cpufreq/cpufreq_stats.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index 6cd5c8ab5d49..da717f7cd9a9 100644 --- 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; |