[PATCH 2/2] cpufreq: governors: Remove code redundancy between governors

Viresh Kumar
2013-01-31T17:28:26Z

With the inclusion of following patches:

9f4eb10 cpufreq: conservative: call dbs_check_cpu only when necessary
772b4b1 cpufreq: ondemand: call dbs_check_cpu only when necessary

code redundancy is introduced again. Get rid of it.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/cpufreq/cpufreq_conservative.c | 52 ++++-------------------
drivers/cpufreq/cpufreq_governor.c | 18 ++++++++
drivers/cpufreq/cpufreq_governor.h | 2 +
drivers/cpufreq/cpufreq_ondemand.c | 77 ++++++++++------------------------
4 files changed, 52 insertions(+), 97 deletions(-)

diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index c18a304..e8bb915 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -111,58 +111,24 @@ static void cs_check_cpu(int cpu, unsigned int load)
}
}

-static void cs_timer_update(struct cs_cpu_dbs_info_s *dbs_info, bool sample,
- struct delayed_work *dw)
+static void cs_dbs_timer(struct work_struct *work)
{
+ struct delayed_work *dw = to_delayed_work(work);
+ struct cs_cpu_dbs_info_s *dbs_info = container_of(work,
+ struct cs_cpu_dbs_info_s, cdbs.work.work);
unsigned int cpu = dbs_info->cdbs.cur_policy->cpu;
+ struct cs_cpu_dbs_info_s *core_dbs_info = &per_cpu(cs_cpu_dbs_info,
+ cpu);
int delay = delay_for_sampling_rate(cs_tuners.sampling_rate);

- if (sample)
+ mutex_lock(&core_dbs_info->cdbs.timer_mutex);
+ if (need_load_eval(&core_dbs_info->cdbs, cs_tuners.sampling_rate))
dbs_check_cpu(&cs_dbs_data, cpu);

schedule_delayed_work_on(smp_processor_id(), dw, delay);
+ mutex_unlock(&core_dbs_info->cdbs.timer_mutex);
}

-static void cs_timer_coordinated(struct cs_cpu_dbs_info_s *dbs_info_local,
- struct delayed_work *dw)
-{
- struct cs_cpu_dbs_info_s *dbs_info;
- ktime_t time_now;
- s64 delta_us;
- bool sample = true;
-
- /* use leader CPU's dbs_info */
- dbs_info = &per_cpu(cs_cpu_dbs_info,
- dbs_info_local->cdbs.cur_policy->cpu);
- mutex_lock(&dbs_info->cdbs.timer_mutex);
-
- time_now = ktime_get();
- delta_us = ktime_us_delta(time_now, dbs_info->cdbs.time_stamp);
-
- /* Do nothing if we recently have sampled */
- if (delta_us < (s64)(cs_tuners.sampling_rate / 2))
- sample = false;
- else
- dbs_info->cdbs.time_stamp = time_now;
-
- cs_timer_update(dbs_info, sample, dw);
- mutex_unlock(&dbs_info->cdbs.timer_mutex);
-}
-
-static void cs_dbs_timer(struct work_struct *work)
-{
- struct delayed_work *dw = to_delayed_work(work);
- struct cs_cpu_dbs_info_s *dbs_info = container_of(work,
- struct cs_cpu_dbs_info_s, cdbs.work.work);
-
- if (policy_is_shared(dbs_info->cdbs.cur_policy)) {
- cs_timer_coordinated(dbs_info, dw);
- } else {
- mutex_lock(&dbs_info->cdbs.timer_mutex);
- cs_timer_update(dbs_info, true, dw);
- mutex_unlock(&dbs_info->cdbs.timer_mutex);
- }
-}
static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 29d6a59..dc99472 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -177,6 +177,24 @@ static inline void dbs_timer_exit(struct dbs_data *dbs_data, int cpu)
cancel_delayed_work_sync(&cdbs->work);
}

+/* Will return if we need to evaluate cpu load again or not */
+bool need_load_eval(struct cpu_dbs_common_info *cdbs,
+ unsigned int sampling_rate)
+{
+ if (policy_is_shared(cdbs->cur_policy)) {
+ ktime_t time_now = ktime_get();
+ s64 delta_us = ktime_us_delta(time_now, cdbs->time_stamp);
+
+ /* Do nothing if we recently have sampled */
+ if (delta_us < (s64)(sampling_rate / 2))
+ return false;
+ else
+ cdbs->time_stamp = time_now;
+ }
+
+ return true;
+}
+
int cpufreq_governor_dbs(struct dbs_data *dbs_data,
struct cpufreq_policy *policy, unsigned int event)
{
diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
index c19a16c..16314b6 100644
--- a/drivers/cpufreq/cpufreq_governor.h
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -171,6 +171,8 @@ static inline int delay_for_sampling_rate(unsigned int sampling_rate)

u64 get_cpu_idle_time(unsigned int cpu, u64 *wall);
void dbs_check_cpu(struct dbs_data *dbs_data, int cpu);
+bool need_load_eval(struct cpu_dbs_common_info *cdbs,
+ unsigned int sampling_rate);
int cpufreq_governor_dbs(struct dbs_data *dbs_data,
struct cpufreq_policy *policy, unsigned int event);
#endif /* _CPUFREQ_GOVERNER_H */
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 75efd5e..f38b8da 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -216,75 +216,44 @@ static void od_check_cpu(int cpu, unsigned int load_freq)
}
}

-static void od_timer_update(struct od_cpu_dbs_info_s *dbs_info, bool sample,
- struct delayed_work *dw)
+static void od_dbs_timer(struct work_struct *work)
{
+ struct delayed_work *dw = to_delayed_work(work);
+ struct od_cpu_dbs_info_s *dbs_info =
+ container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work);
unsigned int cpu = dbs_info->cdbs.cur_policy->cpu;
- int delay, sample_type = dbs_info->sample_type;
+ struct od_cpu_dbs_info_s *core_dbs_info = &per_cpu(od_cpu_dbs_info,
+ cpu);
+ int delay, sample_type = core_dbs_info->sample_type;
+ bool eval_load;
+
+ mutex_lock(&core_dbs_info->cdbs.timer_mutex);
+ eval_load = need_load_eval(&core_dbs_info->cdbs,
+ od_tuners.sampling_rate);

/* Common NORMAL_SAMPLE setup */
- dbs_info->sample_type = OD_NORMAL_SAMPLE;
+ core_dbs_info->sample_type = OD_NORMAL_SAMPLE;
if (sample_type == OD_SUB_SAMPLE) {
- delay = dbs_info->freq_lo_jiffies;
- if (sample)
- __cpufreq_driver_target(dbs_info->cdbs.cur_policy,
- dbs_info->freq_lo,
+ delay = core_dbs_info->freq_lo_jiffies;
+ if (eval_load)
+ __cpufreq_driver_target(core_dbs_info->cdbs.cur_policy,
+ core_dbs_info->freq_lo,
CPUFREQ_RELATION_H);
} else {
- if (sample)
+ if (eval_load)
dbs_check_cpu(&od_dbs_data, cpu);
- if (dbs_info->freq_lo) {
+ if (core_dbs_info->freq_lo) {
/* Setup timer for SUB_SAMPLE */
- dbs_info->sample_type = OD_SUB_SAMPLE;
- delay = dbs_info->freq_hi_jiffies;
+ core_dbs_info->sample_type = OD_SUB_SAMPLE;
+ delay = core_dbs_info->freq_hi_jiffies;
} else {
delay = delay_for_sampling_rate(od_tuners.sampling_rate
- * dbs_info->rate_mult);
+ * core_dbs_info->rate_mult);
}
}

schedule_delayed_work_on(smp_processor_id(), dw, delay);
-}
-
-static void od_timer_coordinated(struct od_cpu_dbs_info_s *dbs_info_local,
- struct delayed_work *dw)
-{
- struct od_cpu_dbs_info_s *dbs_info;
- ktime_t time_now;
- s64 delta_us;
- bool sample = true;
-
- /* use leader CPU's dbs_info */
- dbs_info = &per_cpu(od_cpu_dbs_info,
- dbs_info_local->cdbs.cur_policy->cpu);
- mutex_lock(&dbs_info->cdbs.timer_mutex);
-
- time_now = ktime_get();
- delta_us = ktime_us_delta(time_now, dbs_info->cdbs.time_stamp);
-
- /* Do nothing if we recently have sampled */
- if (delta_us < (s64)(od_tuners.sampling_rate / 2))
- sample = false;
- else
- dbs_info->cdbs.time_stamp = time_now;
-
- od_timer_update(dbs_info, sample, dw);
- mutex_unlock(&dbs_info->cdbs.timer_mutex);
-}
-
-static void od_dbs_timer(struct work_struct *work)
-{
- struct delayed_work *dw = to_delayed_work(work);
- struct od_cpu_dbs_info_s *dbs_info =
- container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work);
-
- if (policy_is_shared(dbs_info->cdbs.cur_policy)) {
- od_timer_coordinated(dbs_info, dw);
- } else {
- mutex_lock(&dbs_info->cdbs.timer_mutex);
- od_timer_update(dbs_info, true, dw);
- mutex_unlock(&dbs_info->cdbs.timer_mutex);
- }
+ mutex_unlock(&core_dbs_info->cdbs.timer_mutex);
}

/************************** sysfs interface ************************/
--
1.7.12.rc2.18.g61b472e