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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-02-15 02:19:31 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-03-09 14:41:04 +0100
commit4cccf7555770b787fa80791a1407a27301f03920 (patch)
treedc13b9cde7a19c1416707bbb88307572f559b952 /drivers/cpufreq/cpufreq_conservative.c
parent57eb832f90e645dcb97d651ad052c0537cc1b3a7 (diff)
downloadlinux-4cccf7555770b787fa80791a1407a27301f03920.tar.gz
cpufreq: governor: Get rid of the ->gov_check_cpu callback
The way the ->gov_check_cpu governor callback is used by the ondemand and conservative governors is not really straightforward. Namely, the governor calls dbs_check_cpu() that updates the load information for the policy and the invokes ->gov_check_cpu() for the governor. To get rid of that entanglement, notice that cpufreq_governor_limits() doesn't need to call dbs_check_cpu() directly. Instead, it can simply reset the sample delay to 0 which will cause a sample to be taken immediately. The result of that is practically equivalent to calling dbs_check_cpu() except that it will trigger a full update of governor internal state and not just the ->gov_check_cpu() part. Following that observation, make cpufreq_governor_limits() reset the sample delay and turn dbs_check_cpu() into a function that will simply evaluate the load and return the result called dbs_update(). That function can now be called by governors from the routines that previously were pointed to by ->gov_check_cpu and those routines can be called directly by each governor instead of dbs_check_cpu(). This way ->gov_check_cpu becomes unnecessary, so drop it. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq/cpufreq_conservative.c')
-rw-r--r--drivers/cpufreq/cpufreq_conservative.c26
1 files changed, 9 insertions, 17 deletions
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 6243502ce24d..2e9040e8640c 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -44,20 +44,20 @@ static inline unsigned int get_freq_target(struct cs_dbs_tuners *cs_tuners,
* Any frequency increase takes it to the maximum frequency. Frequency reduction
* happens at minimum steps of 5% (default) of maximum frequency
*/
-static void cs_check_cpu(int cpu, unsigned int load)
+static unsigned int cs_dbs_timer(struct cpufreq_policy *policy)
{
- struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, cpu);
- struct cpufreq_policy *policy = dbs_info->cdbs.policy_dbs->policy;
+ struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, policy->cpu);
struct policy_dbs_info *policy_dbs = policy->governor_data;
struct dbs_data *dbs_data = policy_dbs->dbs_data;
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ unsigned int load = dbs_update(policy);
/*
* break out if we 'cannot' reduce the speed as the user might
* want freq_step to be zero
*/
if (cs_tuners->freq_step == 0)
- return;
+ goto out;
/* Check for frequency increase */
if (load > dbs_data->up_threshold) {
@@ -65,7 +65,7 @@ static void cs_check_cpu(int cpu, unsigned int load)
/* if we are already at full speed then break out early */
if (dbs_info->requested_freq == policy->max)
- return;
+ goto out;
dbs_info->requested_freq += get_freq_target(cs_tuners, policy);
@@ -74,12 +74,12 @@ static void cs_check_cpu(int cpu, unsigned int load)
__cpufreq_driver_target(policy, dbs_info->requested_freq,
CPUFREQ_RELATION_H);
- return;
+ goto out;
}
/* if sampling_down_factor is active break out early */
if (++dbs_info->down_skip < dbs_data->sampling_down_factor)
- return;
+ goto out;
dbs_info->down_skip = 0;
/* Check for frequency decrease */
@@ -89,7 +89,7 @@ static void cs_check_cpu(int cpu, unsigned int load)
* if we cannot reduce the frequency anymore, break out early
*/
if (policy->cur == policy->min)
- return;
+ goto out;
freq_target = get_freq_target(cs_tuners, policy);
if (dbs_info->requested_freq > freq_target)
@@ -99,16 +99,9 @@ static void cs_check_cpu(int cpu, unsigned int load)
__cpufreq_driver_target(policy, dbs_info->requested_freq,
CPUFREQ_RELATION_L);
- return;
}
-}
-
-static unsigned int cs_dbs_timer(struct cpufreq_policy *policy)
-{
- struct policy_dbs_info *policy_dbs = policy->governor_data;
- struct dbs_data *dbs_data = policy_dbs->dbs_data;
- dbs_check_cpu(policy);
+ out:
return delay_for_sampling_rate(dbs_data->sampling_rate);
}
@@ -300,7 +293,6 @@ static struct dbs_governor cs_dbs_gov = {
.get_cpu_cdbs = get_cpu_cdbs,
.get_cpu_dbs_info_s = get_cpu_dbs_info_s,
.gov_dbs_timer = cs_dbs_timer,
- .gov_check_cpu = cs_check_cpu,
.init = cs_init,
.exit = cs_exit,
};