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Message-Id: <92be8bede3340aa93549b468528f60244fbc50f2.1454507872.git.viresh.kumar@linaro.org>
Date: Wed, 3 Feb 2016 19:32:17 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Rafael Wysocki <rjw@...ysocki.net>, juri.lelli@....com
Cc: linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
skannan@...eaurora.org, peterz@...radead.org,
mturquette@...libre.com, steve.muckle@...aro.org,
vincent.guittot@...aro.org, morten.rasmussen@....com,
dietmar.eggemann@....com, linux-kernel@...r.kernel.org,
Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH V2 1/7] cpufreq: governor: Treat min_sampling_rate as a governor-specific tunable
The min_sampling_rate governor tunable is a field in struct dbs_data, so
it has to be handled in a special way separate from the rest of governor
tunables. In particular, that requires a special macro to be present
for creating its show/store sysfs attribute callbacks.
However, there is no real need for the data structures and code in
question to be arranged this way and if min_sampling_rate is moved to
data structures holding the other governor tunables, the sysfs attribute
creation macros that work with those tunables will also work with
min_sampling_rate and the special macro for it won't be necessary any
more. That will make it easier to modify the governor code going
forward, so do it.
[ Rafael: Written changelog ]
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
drivers/cpufreq/cpufreq_conservative.c | 14 ++++++-------
drivers/cpufreq/cpufreq_governor.c | 36 ++++++++++++++++++++--------------
drivers/cpufreq/cpufreq_governor.h | 18 ++---------------
drivers/cpufreq/cpufreq_ondemand.c | 14 ++++++-------
4 files changed, 37 insertions(+), 45 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 606ad74abe6e..57750367bd26 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -185,7 +185,7 @@ static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf,
if (ret != 1)
return -EINVAL;
- cs_tuners->sampling_rate = max(input, dbs_data->min_sampling_rate);
+ cs_tuners->sampling_rate = max(input, cs_tuners->min_sampling_rate);
return count;
}
@@ -281,7 +281,7 @@ show_store_one(cs, up_threshold);
show_store_one(cs, down_threshold);
show_store_one(cs, ignore_nice_load);
show_store_one(cs, freq_step);
-declare_show_sampling_rate_min(cs);
+show_one(cs, min_sampling_rate);
gov_sys_pol_attr_rw(sampling_rate);
gov_sys_pol_attr_rw(sampling_down_factor);
@@ -289,10 +289,10 @@ gov_sys_pol_attr_rw(up_threshold);
gov_sys_pol_attr_rw(down_threshold);
gov_sys_pol_attr_rw(ignore_nice_load);
gov_sys_pol_attr_rw(freq_step);
-gov_sys_pol_attr_ro(sampling_rate_min);
+gov_sys_pol_attr_ro(min_sampling_rate);
static struct attribute *dbs_attributes_gov_sys[] = {
- &sampling_rate_min_gov_sys.attr,
+ &min_sampling_rate_gov_sys.attr,
&sampling_rate_gov_sys.attr,
&sampling_down_factor_gov_sys.attr,
&up_threshold_gov_sys.attr,
@@ -308,7 +308,7 @@ static struct attribute_group cs_attr_group_gov_sys = {
};
static struct attribute *dbs_attributes_gov_pol[] = {
- &sampling_rate_min_gov_pol.attr,
+ &min_sampling_rate_gov_pol.attr,
&sampling_rate_gov_pol.attr,
&sampling_down_factor_gov_pol.attr,
&up_threshold_gov_pol.attr,
@@ -340,10 +340,10 @@ static int cs_init(struct dbs_data *dbs_data, bool notify)
tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
tuners->ignore_nice_load = 0;
tuners->freq_step = DEF_FREQUENCY_STEP;
+ tuners->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
+ jiffies_to_usecs(10);
dbs_data->tuners = tuners;
- dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
- jiffies_to_usecs(10);
if (notify)
cpufreq_register_notifier(&cs_cpufreq_notifier_block,
diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index e0d111024d48..9a7edc91ad57 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -286,16 +286,32 @@ static void dbs_timer_handler(unsigned long data)
queue_work(system_wq, &shared->work);
}
-static void set_sampling_rate(struct dbs_data *dbs_data,
- unsigned int sampling_rate)
+static void set_sampling_rate(struct cpufreq_policy *policy,
+ struct dbs_data *dbs_data)
{
+ unsigned int *sampling_rate;
+ unsigned int *min_sampling_rate;
+ unsigned int latency;
+
+ /* policy latency is in ns. Convert it to us first */
+ latency = policy->cpuinfo.transition_latency / 1000;
+ if (latency == 0)
+ latency = 1;
+
if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
- cs_tuners->sampling_rate = sampling_rate;
+ sampling_rate = &cs_tuners->sampling_rate;
+ min_sampling_rate = &cs_tuners->min_sampling_rate;
} else {
struct od_dbs_tuners *od_tuners = dbs_data->tuners;
- od_tuners->sampling_rate = sampling_rate;
+ sampling_rate = &od_tuners->sampling_rate;
+ min_sampling_rate = &od_tuners->min_sampling_rate;
}
+
+ /* Bring kernel and HW constraints together */
+ *min_sampling_rate = max(*min_sampling_rate,
+ MIN_LATENCY_MULTIPLIER * latency);
+ *sampling_rate = max(*min_sampling_rate, latency * LATENCY_MULTIPLIER);
}
static int alloc_common_dbs_info(struct cpufreq_policy *policy,
@@ -338,7 +354,6 @@ static int cpufreq_governor_init(struct cpufreq_policy *policy,
struct dbs_data *dbs_data,
struct common_dbs_data *cdata)
{
- unsigned int latency;
int ret;
/* State should be equivalent to EXIT */
@@ -373,16 +388,7 @@ static int cpufreq_governor_init(struct cpufreq_policy *policy,
if (ret)
goto free_common_dbs_info;
- /* policy latency is in ns. Convert it to us first */
- latency = policy->cpuinfo.transition_latency / 1000;
- if (latency == 0)
- latency = 1;
-
- /* Bring kernel and HW constraints together */
- dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate,
- MIN_LATENCY_MULTIPLIER * latency);
- set_sampling_rate(dbs_data, max(dbs_data->min_sampling_rate,
- latency * LATENCY_MULTIPLIER));
+ set_sampling_rate(policy, dbs_data);
if (!have_governor_per_policy())
cdata->gdbs_data = dbs_data;
diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
index 91e767a058a7..ad44a8546a3a 100644
--- a/drivers/cpufreq/cpufreq_governor.h
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -183,6 +183,7 @@ struct od_dbs_tuners {
unsigned int up_threshold;
unsigned int powersave_bias;
unsigned int io_is_busy;
+ unsigned int min_sampling_rate;
};
struct cs_dbs_tuners {
@@ -192,6 +193,7 @@ struct cs_dbs_tuners {
unsigned int up_threshold;
unsigned int down_threshold;
unsigned int freq_step;
+ unsigned int min_sampling_rate;
};
/* Common Governor data across policies */
@@ -230,7 +232,6 @@ struct common_dbs_data {
/* Governor Per policy data */
struct dbs_data {
struct common_dbs_data *cdata;
- unsigned int min_sampling_rate;
int usage_count;
void *tuners;
};
@@ -254,21 +255,6 @@ static inline int delay_for_sampling_rate(unsigned int sampling_rate)
return delay;
}
-#define declare_show_sampling_rate_min(_gov) \
-static ssize_t show_sampling_rate_min_gov_sys \
-(struct kobject *kobj, struct attribute *attr, char *buf) \
-{ \
- struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \
- return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
-} \
- \
-static ssize_t show_sampling_rate_min_gov_pol \
-(struct cpufreq_policy *policy, char *buf) \
-{ \
- struct dbs_data *dbs_data = policy->governor_data; \
- return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
-}
-
extern struct mutex cpufreq_governor_lock;
void gov_add_timers(struct cpufreq_policy *policy, unsigned int delay);
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index eae51070c034..b31f64745232 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -250,7 +250,7 @@ static void update_sampling_rate(struct dbs_data *dbs_data,
int cpu;
od_tuners->sampling_rate = new_rate = max(new_rate,
- dbs_data->min_sampling_rate);
+ od_tuners->min_sampling_rate);
/*
* Lock governor so that governor start/stop can't execute in parallel.
@@ -442,7 +442,7 @@ show_store_one(od, up_threshold);
show_store_one(od, sampling_down_factor);
show_store_one(od, ignore_nice_load);
show_store_one(od, powersave_bias);
-declare_show_sampling_rate_min(od);
+show_one(od, min_sampling_rate);
gov_sys_pol_attr_rw(sampling_rate);
gov_sys_pol_attr_rw(io_is_busy);
@@ -450,10 +450,10 @@ gov_sys_pol_attr_rw(up_threshold);
gov_sys_pol_attr_rw(sampling_down_factor);
gov_sys_pol_attr_rw(ignore_nice_load);
gov_sys_pol_attr_rw(powersave_bias);
-gov_sys_pol_attr_ro(sampling_rate_min);
+gov_sys_pol_attr_ro(min_sampling_rate);
static struct attribute *dbs_attributes_gov_sys[] = {
- &sampling_rate_min_gov_sys.attr,
+ &min_sampling_rate_gov_sys.attr,
&sampling_rate_gov_sys.attr,
&up_threshold_gov_sys.attr,
&sampling_down_factor_gov_sys.attr,
@@ -469,7 +469,7 @@ static struct attribute_group od_attr_group_gov_sys = {
};
static struct attribute *dbs_attributes_gov_pol[] = {
- &sampling_rate_min_gov_pol.attr,
+ &min_sampling_rate_gov_pol.attr,
&sampling_rate_gov_pol.attr,
&up_threshold_gov_pol.attr,
&sampling_down_factor_gov_pol.attr,
@@ -509,12 +509,12 @@ static int od_init(struct dbs_data *dbs_data, bool notify)
* not depending on HZ, but fixed (very low). The deferred
* timer might skip some samples if idle/sleeping as needed.
*/
- dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
+ tuners->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
} else {
tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
/* For correct statistics, we need 10 ticks for each measure */
- dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
+ tuners->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
jiffies_to_usecs(10);
}
--
2.7.0.79.gdc08a19
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