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authorElias Oltmanns <eo@nebensachen.de>2007-10-22 11:50:13 +0400
committerDave Jones <davej@redhat.com>2007-10-23 00:34:39 +0400
commita8d7c3bc2396aff14f9e920677072cb55b016040 (patch)
treea962a7dbbe578abeaa69ce3f76cd3eb3d59643bc /drivers
parentc5829cd07ec4c08daa7ff91c821af9b2ac7748df (diff)
downloadlinux-a8d7c3bc2396aff14f9e920677072cb55b016040.tar.xz
[CPUFREQ] Make cpufreq_conservative handle out-of-sync events properly
Make cpufreq_conservative handle out-of-sync events properly Currently, the cpufreq_conservative governor doesn't get notified when the actual frequency the cpu is running at differs from what cpufreq thought it was. As a result the cpu may stay at the maximum frequency after a s2ram / resume cycle even though the system is idle. Signed-off-by: Elias Oltmanns <eo@nebensachen.de> Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/cpufreq/cpufreq_conservative.c32
1 files changed, 30 insertions, 2 deletions
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 4bd33ce8a6f3..57d02e990af3 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -116,6 +116,27 @@ static inline unsigned int get_cpu_idle_time(unsigned int cpu)
return ret;
}
+/* keep track of frequency transitions */
+static int
+dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ struct cpufreq_freqs *freq = data;
+ struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cpu_dbs_info,
+ freq->cpu);
+
+ if (!this_dbs_info->enable)
+ return 0;
+
+ this_dbs_info->requested_freq = freq->new;
+
+ return 0;
+}
+
+static struct notifier_block dbs_cpufreq_notifier_block = {
+ .notifier_call = dbs_cpufreq_notifier
+};
+
/************************** sysfs interface ************************/
static ssize_t show_sampling_rate_max(struct cpufreq_policy *policy, char *buf)
{
@@ -511,6 +532,9 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
dbs_tuners_ins.sampling_rate = def_sampling_rate;
dbs_timer_init();
+ cpufreq_register_notifier(
+ &dbs_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
}
mutex_unlock(&dbs_mutex);
@@ -525,9 +549,13 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
* Stop the timerschedule work, when this governor
* is used for first time
*/
- if (dbs_enable == 0)
+ if (dbs_enable == 0) {
dbs_timer_exit();
-
+ cpufreq_unregister_notifier(
+ &dbs_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+
mutex_unlock(&dbs_mutex);
break;