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Merge branch 'pm-cpuidle'

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* pm-cpuidle:
  cpuidle: Pass exit latency limit to cpuidle_use_deepest_state()
  cpuidle: Allow idle injection to apply exit latency limit
  cpuidle: Introduce cpuidle_driver_state_disabled() for driver quirks
  cpuidle: teo: Avoid code duplication in conditionals
  cpuidle: teo: Avoid using "early hits" incorrectly
  cpuidle: teo: Exclude cpuidle overhead from computations
  cpuidle: Use nanoseconds as the unit of time
  cpuidle: Consolidate disabled state checks
  ACPI: processor_idle: Skip dummy wait if kernel is in guest
  cpuidle: Do not unset the driver if it is there already
  cpuidle: teo: Fix "early hits" handling for disabled idle states
  cpuidle: teo: Consider hits and misses metrics of disabled states
  cpuidle: teo: Rename local variable in teo_select()
  cpuidle: teo: Ignore disabled idle states that are too deep
This commit is contained in:
Rafael J. Wysocki
2019-11-26 10:26:26 +01:00
parent 05ff1ba412 5aa9ba6312
commit 6221403952
16 changed files with 402 additions and 265 deletions
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24
kernel/sched/idle.c
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@@ -104,7 +104,7 @@ static int call_cpuidle(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* update no idle residency and return.
*/
if (current_clr_polling_and_test()) {
dev->last_residency = 0;
dev->last_residency_ns = 0;
local_irq_enable();
return -EBUSY;
}
@@ -165,7 +165,9 @@ static void cpuidle_idle_call(void)
* until a proper wakeup interrupt happens.
*/
if (idle_should_enter_s2idle() || dev->use_deepest_state) {
if (idle_should_enter_s2idle() || dev->forced_idle_latency_limit_ns) {
u64 max_latency_ns;
if (idle_should_enter_s2idle()) {
rcu_idle_enter();
@@ -176,12 +178,16 @@ static void cpuidle_idle_call(void)
}
rcu_idle_exit();
max_latency_ns = U64_MAX;
} else {
max_latency_ns = dev->forced_idle_latency_limit_ns;
}
tick_nohz_idle_stop_tick();
rcu_idle_enter();
next_state = cpuidle_find_deepest_state(drv, dev);
next_state = cpuidle_find_deepest_state(drv, dev, max_latency_ns);
call_cpuidle(drv, dev, next_state);
} else {
bool stop_tick = true;
@@ -311,7 +317,7 @@ static enum hrtimer_restart idle_inject_timer_fn(struct hrtimer *timer)
return HRTIMER_NORESTART;
}
void play_idle(unsigned long duration_us)
void play_idle_precise(u64 duration_ns, u64 latency_ns)
{
struct idle_timer it;
@@ -323,29 +329,29 @@ void play_idle(unsigned long duration_us)
WARN_ON_ONCE(current->nr_cpus_allowed != 1);
WARN_ON_ONCE(!(current->flags & PF_KTHREAD));
WARN_ON_ONCE(!(current->flags & PF_NO_SETAFFINITY));
WARN_ON_ONCE(!duration_us);
WARN_ON_ONCE(!duration_ns);
rcu_sleep_check();
preempt_disable();
current->flags |= PF_IDLE;
cpuidle_use_deepest_state(true);
cpuidle_use_deepest_state(latency_ns);
it.done = 0;
hrtimer_init_on_stack(&it.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
it.timer.function = idle_inject_timer_fn;
hrtimer_start(&it.timer, ns_to_ktime(duration_us * NSEC_PER_USEC),
hrtimer_start(&it.timer, ns_to_ktime(duration_ns),
HRTIMER_MODE_REL_PINNED);
while (!READ_ONCE(it.done))
do_idle();
cpuidle_use_deepest_state(false);
cpuidle_use_deepest_state(0);
current->flags &= ~PF_IDLE;
preempt_fold_need_resched();
preempt_enable();
}
EXPORT_SYMBOL_GPL(play_idle);
EXPORT_SYMBOL_GPL(play_idle_precise);
void cpu_startup_entry(enum cpuhp_state state)
{