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Subject[PATCH 4/4] thermal/intel_powerclamp: stop sched tick in forced idle
Date
With the introduction of play_idle(), idle injection kthread can
go through the normal idle task processing to get correct accounting
and turn off scheduler tick when possible.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
drivers/thermal/intel_powerclamp.c | 35 +----------------------------------
1 file changed, 1 insertion(+), 34 deletions(-)

diff --git a/drivers/thermal/intel_powerclamp.c b/drivers/thermal/intel_powerclamp.c
index 1310283..83e6971 100644
--- a/drivers/thermal/intel_powerclamp.c
+++ b/drivers/thermal/intel_powerclamp.c
@@ -92,7 +92,6 @@ struct powerclamp_worker_data {
struct kthread_worker *worker;
struct kthread_work balancing_work;
struct kthread_delayed_work idle_injection_work;
- struct timer_list wakeup_timer;
unsigned int cpu;
unsigned int count;
unsigned int guard;
@@ -277,11 +276,6 @@ static u64 pkg_state_counter(void)
return count;
}

-static void noop_timer(unsigned long foo)
-{
- /* empty... just the fact that we get the interrupt wakes us up */
-}
-
static unsigned int get_compensation(int ratio)
{
unsigned int comp = 0;
@@ -431,7 +425,6 @@ static void clamp_balancing_func(struct kthread_work *work)
static void clamp_idle_injection_func(struct kthread_work *work)
{
struct powerclamp_worker_data *w_data;
- unsigned long target_jiffies;

w_data = container_of(work, struct powerclamp_worker_data,
idle_injection_work.work);
@@ -452,31 +445,7 @@ static void clamp_idle_injection_func(struct kthread_work *work)
if (should_skip)
goto balance;

- target_jiffies = jiffies + w_data->duration_jiffies;
- mod_timer(&w_data->wakeup_timer, target_jiffies);
- if (unlikely(local_softirq_pending()))
- goto balance;
- /*
- * stop tick sched during idle time, interrupts are still
- * allowed. thus jiffies are updated properly.
- */
- preempt_disable();
- /* mwait until target jiffies is reached */
- while (time_before(jiffies, target_jiffies)) {
- unsigned long ecx = 1;
- unsigned long eax = target_mwait;
-
- /*
- * REVISIT: may call enter_idle() to notify drivers who
- * can save power during cpu idle. same for exit_idle()
- */
- local_touch_nmi();
- stop_critical_timings();
- mwait_idle_with_hints(eax, ecx);
- start_critical_timings();
- atomic_inc(&idle_wakeup_counter);
- }
- preempt_enable();
+ play_idle(jiffies_to_msecs(w_data->duration_jiffies));

balance:
if (clamping && w_data->clamping && cpu_online(w_data->cpu))
@@ -538,7 +507,6 @@ static void start_power_clamp_worker(unsigned long cpu)
w_data->cpu = cpu;
w_data->clamping = true;
set_bit(cpu, cpu_clamping_mask);
- setup_timer(&w_data->wakeup_timer, noop_timer, 0);
sched_setscheduler(worker->task, SCHED_FIFO, &sparam);
kthread_init_work(&w_data->balancing_work, clamp_balancing_func);
kthread_init_delayed_work(&w_data->idle_injection_work,
@@ -570,7 +538,6 @@ static void stop_power_clamp_worker(unsigned long cpu)
* a big deal. The balancing work is fast and destroy kthread
* will wait for it.
*/
- del_timer_sync(&w_data->wakeup_timer);
clear_bit(w_data->cpu, cpu_clamping_mask);
kthread_destroy_worker(w_data->worker);

--
1.9.1
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