AcoSail/kernel_optimize_test
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cpufreq: stats: pass 'stat' to cpufreq_stats_update()

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It is better to pass a struct cpufreq_stats pointer to cpufreq_stats_update()
instead of a CPU number, because that's all it needs.

Even if we pass a cpu number to cpufreq_stats_update(), it reads the per-cpu
variable to get 'stats' out of it. So we are doing these operations
unnecessarily:
- First getting the cpu number to pass to cpufreq_stats_update(), stat->cpu.
- And then getting stats from the cpu, per_cpu(cpufreq_stats_table, cpu).

Reviewed-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2015-01-06 21:09:05 +05:30 committed by Rafael J. Wysocki
parent f93dbbbd10
commit 2aba0c1bae
1 changed files with 4 additions and 6 deletions
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10
drivers/cpufreq/cpufreq_stats.c
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@ -33,13 +33,11 @@ struct cpufreq_stats {
static DEFINE_PER_CPU(struct cpufreq_stats *, cpufreq_stats_table);
static int cpufreq_stats_update(unsigned int cpu)
static int cpufreq_stats_update(struct cpufreq_stats *stat)
{
struct cpufreq_stats *stat;
unsigned long long cur_time = get_jiffies_64();
spin_lock(&cpufreq_stats_lock);
stat = per_cpu(cpufreq_stats_table, cpu);
if (stat->time_in_state)
stat->time_in_state[stat->last_index] +=
cur_time - stat->last_time;
@ -64,7 +62,7 @@ static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
if (!stat)
return 0;
cpufreq_stats_update(stat->cpu);
cpufreq_stats_update(stat);
for (i = 0; i < stat->state_num; i++) {
len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i],
(unsigned long long)
@ -82,7 +80,7 @@ static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
if (!stat)
return 0;
cpufreq_stats_update(stat->cpu);
cpufreq_stats_update(stat);
len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
len += snprintf(buf + len, PAGE_SIZE - len, " : ");
for (i = 0; i < stat->state_num; i++) {
@ -307,7 +305,7 @@ static int cpufreq_stat_notifier_trans(struct notifier_block *nb,
if (old_index == -1 || new_index == -1)
return 0;
cpufreq_stats_update(freq->cpu);
cpufreq_stats_update(stat);
if (old_index == new_index)
return 0;