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cpufreq: Use dedicated high-priority workqueues

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In the process of scaling CPU frequencies, cpufreq and the APIS is
calls may hold resources that will prevent threads critical for
system stability from running.

Specifically, thermal-mitigation software may need to respond
quickly to high-temperature conditions and throttle the CPU speed
in an effort to cool down. If the system is already in the middle
of a CPU frequency switch being executed on behalf of a cpufreq
governor, thermal mitigation will be blocked until the scaling
action has completed. If the system is under heave load of medium
or high-priority threads, this may take a long while and the system
may potentially surpass thermal limits in the meantime.

Resolve this by using high priority workqueues for all ondemand
and conservative governor scaling operations.  This will allow them
to complete promptly and release their hold on resources necessary
for maintaining system stability.

Change-Id: I2f56052c131442838036cf4cdd8059f7c09bb805
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
Signed-off-by: Ajay Dudani <adudani@codeaurora.org>
This commit is contained in:
Ajay Dudani 2013-06-04 13:10:46 -07:00 committed by Iliyan Malchev
parent 951ba1b0f4
commit a554e38f94
2 changed files with 29 additions and 15 deletions
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13
drivers/cpufreq/cpufreq_conservative.c
View file

@ -80,6 +80,8 @@ static unsigned int dbs_enable; /* number of CPUs using this policy */
*/
static DEFINE_MUTEX(dbs_mutex);
static struct workqueue_struct *dbs_wq;
static struct dbs_tuners {
unsigned int sampling_rate;
unsigned int sampling_down_factor;
@ -455,7 +457,7 @@ static void do_dbs_timer(struct work_struct *work)
dbs_check_cpu(dbs_info);
schedule_delayed_work_on(cpu, &dbs_info->work, delay);
queue_delayed_work_on(cpu, dbs_wq, &dbs_info->work, delay);
mutex_unlock(&dbs_info->timer_mutex);
}
@ -467,7 +469,7 @@ static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
dbs_info->enable = 1;
INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer);
schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, delay);
queue_delayed_work_on(dbs_info->cpu, dbs_wq, &dbs_info->work, delay);
}
static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
@ -602,12 +604,19 @@ struct cpufreq_governor cpufreq_gov_conservative = {
static int __init cpufreq_gov_dbs_init(void)
{
dbs_wq = alloc_workqueue("conservative_dbs_wq", WQ_HIGHPRI, 0);
if (!dbs_wq) {
printk(KERN_ERR "Failed to create conservative_dbs_wq workqueue\n");
return -EFAULT;
}
return cpufreq_register_governor(&cpufreq_gov_conservative);
}
static void __exit cpufreq_gov_dbs_exit(void)
{
cpufreq_unregister_governor(&cpufreq_gov_conservative);
destroy_workqueue(dbs_wq);
}

31
drivers/cpufreq/cpufreq_ondemand.c
View file

@ -116,7 +116,7 @@ static unsigned int dbs_enable; /* number of CPUs using this policy */
*/
static DEFINE_MUTEX(dbs_mutex);
static struct workqueue_struct *input_wq;
static struct workqueue_struct *dbs_wq;
static DEFINE_PER_CPU(struct work_struct, dbs_refresh_work);
@ -371,8 +371,8 @@ static void update_sampling_rate(unsigned int new_rate)
cancel_delayed_work_sync(&dbs_info->work);
mutex_lock(&dbs_info->timer_mutex);
schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work,
usecs_to_jiffies(new_rate));
queue_delayed_work_on(dbs_info->cpu, dbs_wq,
&dbs_info->work, usecs_to_jiffies(new_rate));
}
mutex_unlock(&dbs_info->timer_mutex);
@ -936,7 +936,7 @@ static void do_dbs_timer(struct work_struct *work)
dbs_info->freq_lo, CPUFREQ_RELATION_H);
delay = dbs_info->freq_lo_jiffies;
}
schedule_delayed_work_on(cpu, &dbs_info->work, delay);
queue_delayed_work_on(cpu, dbs_wq, &dbs_info->work, delay);
mutex_unlock(&dbs_info->timer_mutex);
}
@ -950,7 +950,7 @@ static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
dbs_info->sample_type = DBS_NORMAL_SAMPLE;
INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer);
schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, delay);
queue_delayed_work_on(dbs_info->cpu, dbs_wq, &dbs_info->work, delay);
}
static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
@ -1027,7 +1027,7 @@ static int dbs_migration_notify(struct notifier_block *nb,
&per_cpu(dbs_sync_work, target_cpu);
sync_work->src_cpu = (unsigned int)arg;
queue_work_on(target_cpu, input_wq,
queue_work_on(target_cpu, dbs_wq,
&per_cpu(dbs_sync_work, target_cpu).work);
return NOTIFY_OK;
@ -1117,9 +1117,8 @@ static void dbs_input_event(struct input_handle *handle, unsigned int type,
return;
}
for_each_online_cpu(i) {
queue_work_on(i, input_wq, &per_cpu(dbs_refresh_work, i));
}
for_each_online_cpu(i)
queue_work_on(i, dbs_wq, &per_cpu(dbs_refresh_work, i));
}
static int dbs_input_connect(struct input_handler *handler,
@ -1318,9 +1317,9 @@ static int __init cpufreq_gov_dbs_init(void)
MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10);
}
input_wq = create_workqueue("iewq");
if (!input_wq) {
printk(KERN_ERR "Failed to create iewq workqueue\n");
dbs_wq = alloc_workqueue("ondemand_dbs_wq", WQ_HIGHPRI, 0);
if (!dbs_wq) {
printk(KERN_ERR "Failed to create ondemand_dbs_wq workqueue\n");
return -EFAULT;
}
for_each_possible_cpu(i) {
@ -1343,8 +1342,14 @@ static int __init cpufreq_gov_dbs_init(void)
static void __exit cpufreq_gov_dbs_exit(void)
{
int i;
cpufreq_unregister_governor(&cpufreq_gov_ondemand);
destroy_workqueue(input_wq);
for_each_possible_cpu(i) {
struct cpu_dbs_info_s *this_dbs_info =
&per_cpu(od_cpu_dbs_info, i);
mutex_destroy(&this_dbs_info->timer_mutex);
}
destroy_workqueue(dbs_wq);
}