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cpufreq: governor: Keep single copy of information common to policy->cpus

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Some information is common to all CPUs belonging to a policy, but are
kept on per-cpu basis. Lets keep that in another structure common to all
policy->cpus. That will make updates/reads to that less complex and less
error prone.

The memory for cpu_common_dbs_info is allocated/freed at INIT/EXIT, so
that it we don't reallocate it for STOP/START sequence. It will be also
be used (in next patch) while the governor is stopped and so must not be
freed that early.

Reviewed-and-tested-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
2015-07-18 11:30:59 +05:30
committed by Rafael J. Wysocki
parent 42994af63c
commit 44152cb82d
4 changed files with 114 additions and 58 deletions
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18
drivers/cpufreq/cpufreq_conservative.c
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@@ -47,7 +47,7 @@ static inline unsigned int get_freq_target(struct cs_dbs_tuners *cs_tuners,
static void cs_check_cpu(int cpu, unsigned int load)
{
struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, cpu);
struct cpufreq_policy *policy = dbs_info->cdbs.policy;
struct cpufreq_policy *policy = dbs_info->cdbs.shared->policy;
struct dbs_data *dbs_data = policy->governor_data;
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
@@ -106,22 +106,24 @@ static void cs_dbs_timer(struct work_struct *work)
{
struct cs_cpu_dbs_info_s *dbs_info = container_of(work,
struct cs_cpu_dbs_info_s, cdbs.dwork.work);
unsigned int cpu = dbs_info->cdbs.policy->cpu;
struct cpufreq_policy *policy = dbs_info->cdbs.shared->policy;
unsigned int cpu = policy->cpu;
struct cs_cpu_dbs_info_s *core_dbs_info = &per_cpu(cs_cpu_dbs_info,
cpu);
struct dbs_data *dbs_data = dbs_info->cdbs.policy->governor_data;
struct dbs_data *dbs_data = policy->governor_data;
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
int delay = delay_for_sampling_rate(cs_tuners->sampling_rate);
bool modify_all = true;
mutex_lock(&core_dbs_info->cdbs.timer_mutex);
if (!need_load_eval(&core_dbs_info->cdbs, cs_tuners->sampling_rate))
mutex_lock(&core_dbs_info->cdbs.shared->timer_mutex);
if (!need_load_eval(core_dbs_info->cdbs.shared,
cs_tuners->sampling_rate))
modify_all = false;
else
dbs_check_cpu(dbs_data, cpu);
gov_queue_work(dbs_data, dbs_info->cdbs.policy, delay, modify_all);
mutex_unlock(&core_dbs_info->cdbs.timer_mutex);
gov_queue_work(dbs_data, policy, delay, modify_all);
mutex_unlock(&core_dbs_info->cdbs.shared->timer_mutex);
}
static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
@@ -135,7 +137,7 @@ static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
if (!dbs_info->enable)
return 0;
policy = dbs_info->cdbs.policy;
policy = dbs_info->cdbs.shared->policy;
/*
* we only care if our internally tracked freq moves outside the 'valid'