[PATCH 3/6] cpufreq: tolerate inexact values when collecting stats

Mark Langsdorf
2012-10-30T21:04:13Z

Allow frequency values to vary by +/-5000 Hz when collecting stats.

Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Cc: cpufreq@vger.kernel.org
Cc: Rafael J. Wysocki <rjw@sisk.pl>

---
drivers/cpufreq/cpufreq_stats.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 3998316..4e2ea7e 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -158,9 +158,11 @@ static struct attribute_group stats_attr_group = {
static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
{
int index;
- for (index = 0; index < stat->max_state; index++)
- if (stat->freq_table[index] == freq)
+ for (index = 0; index < stat->max_state; index++) {
+ if ((stat->freq_table[index] < (freq + 5000)) &&
+ (stat->freq_table[index] > (freq - 5000)))
return index;
+ }
return -1;
}

@@ -251,6 +253,8 @@ static int cpufreq_stats_create_table(struct cpufreq_policy *policy,
spin_lock(&cpufreq_stats_lock);
stat->last_time = get_jiffies_64();
stat->last_index = freq_table_get_index(stat, policy->cur);
+ if (stat->last_index > stat->max_state)
+ stat->last_index = stat->max_state - 1;
spin_unlock(&cpufreq_stats_lock);
cpufreq_cpu_put(data);
return 0;
--
1.7.11.7