Merge branches 'pm-cpuidle' and 'pm-qos'
* pm-cpuidle: tick-sched: avoid a maybe-uninitialized warning cpuidle: Add definition of residency to sysfs documentation time: hrtimer: Use timerqueue_iterate_next() to get to the next timer nohz: Avoid duplication of code related to got_idle_tick nohz: Gather tick_sched booleans under a common flag field cpuidle: menu: Avoid selecting shallow states with stopped tick cpuidle: menu: Refine idle state selection for running tick sched: idle: Select idle state before stopping the tick time: hrtimer: Introduce hrtimer_next_event_without() time: tick-sched: Split tick_nohz_stop_sched_tick() cpuidle: Return nohz hint from cpuidle_select() jiffies: Introduce USER_TICK_USEC and redefine TICK_USEC sched: idle: Do not stop the tick before cpuidle_idle_call() sched: idle: Do not stop the tick upfront in the idle loop time: tick-sched: Reorganize idle tick management code * pm-qos: PM / QoS: mark expected switch fall-throughs
This commit is contained in:
Rafael J. Wysocki
Коммит
51798deaff
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@ -40,6 +40,7 @@ total 0
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-r--r--r-- 1 root root 4096 Feb 8 10:42 latency
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-r--r--r-- 1 root root 4096 Feb 8 10:42 name
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-r--r--r-- 1 root root 4096 Feb 8 10:42 power
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-r--r--r-- 1 root root 4096 Feb 8 10:42 residency
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-r--r--r-- 1 root root 4096 Feb 8 10:42 time
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-r--r--r-- 1 root root 4096 Feb 8 10:42 usage
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@ -50,6 +51,7 @@ total 0
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-r--r--r-- 1 root root 4096 Feb 8 10:42 latency
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-r--r--r-- 1 root root 4096 Feb 8 10:42 name
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-r--r--r-- 1 root root 4096 Feb 8 10:42 power
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-r--r--r-- 1 root root 4096 Feb 8 10:42 residency
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-r--r--r-- 1 root root 4096 Feb 8 10:42 time
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-r--r--r-- 1 root root 4096 Feb 8 10:42 usage
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@ -60,6 +62,7 @@ total 0
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-r--r--r-- 1 root root 4096 Feb 8 10:42 latency
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-r--r--r-- 1 root root 4096 Feb 8 10:42 name
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-r--r--r-- 1 root root 4096 Feb 8 10:42 power
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-r--r--r-- 1 root root 4096 Feb 8 10:42 residency
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-r--r--r-- 1 root root 4096 Feb 8 10:42 time
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-r--r--r-- 1 root root 4096 Feb 8 10:42 usage
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@ -70,6 +73,7 @@ total 0
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-r--r--r-- 1 root root 4096 Feb 8 10:42 latency
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-r--r--r-- 1 root root 4096 Feb 8 10:42 name
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-r--r--r-- 1 root root 4096 Feb 8 10:42 power
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-r--r--r-- 1 root root 4096 Feb 8 10:42 residency
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-r--r--r-- 1 root root 4096 Feb 8 10:42 time
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-r--r--r-- 1 root root 4096 Feb 8 10:42 usage
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--------------------------------------------------------------------------------
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@ -78,6 +82,8 @@ total 0
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* desc : Small description about the idle state (string)
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* disable : Option to disable this idle state (bool) -> see note below
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* latency : Latency to exit out of this idle state (in microseconds)
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* residency : Time after which a state becomes more effecient than any
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shallower state (in microseconds)
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* name : Name of the idle state (string)
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* power : Power consumed while in this idle state (in milliwatts)
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* time : Total time spent in this idle state (in microseconds)
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@ -425,6 +425,7 @@ static void xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
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* data back is to call:
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*/
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tick_nohz_idle_enter();
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tick_nohz_idle_stop_tick_protected();
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cpuhp_online_idle(CPUHP_AP_ONLINE_IDLE);
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}
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@ -272,12 +272,18 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
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*
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* @drv: the cpuidle driver
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* @dev: the cpuidle device
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* @stop_tick: indication on whether or not to stop the tick
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*
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* Returns the index of the idle state. The return value must not be negative.
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*
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* The memory location pointed to by @stop_tick is expected to be written the
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* 'false' boolean value if the scheduler tick should not be stopped before
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* entering the returned state.
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*/
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int cpuidle_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
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int cpuidle_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
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bool *stop_tick)
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{
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return cpuidle_curr_governor->select(drv, dev);
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return cpuidle_curr_governor->select(drv, dev, stop_tick);
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}
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/**
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@ -63,9 +63,10 @@ static inline void ladder_do_selection(struct ladder_device *ldev,
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* ladder_select_state - selects the next state to enter
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* @drv: cpuidle driver
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* @dev: the CPU
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* @dummy: not used
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*/
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static int ladder_select_state(struct cpuidle_driver *drv,
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struct cpuidle_device *dev)
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struct cpuidle_device *dev, bool *dummy)
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{
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struct ladder_device *ldev = this_cpu_ptr(&ladder_devices);
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struct device *device = get_cpu_device(dev->cpu);
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@ -123,6 +123,7 @@
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struct menu_device {
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int last_state_idx;
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int needs_update;
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int tick_wakeup;
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unsigned int next_timer_us;
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unsigned int predicted_us;
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@ -279,8 +280,10 @@ again:
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* menu_select - selects the next idle state to enter
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* @drv: cpuidle driver containing state data
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* @dev: the CPU
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* @stop_tick: indication on whether or not to stop the tick
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*/
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static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
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static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
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bool *stop_tick)
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{
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struct menu_device *data = this_cpu_ptr(&menu_devices);
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struct device *device = get_cpu_device(dev->cpu);
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@ -292,6 +295,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
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unsigned int expected_interval;
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unsigned long nr_iowaiters, cpu_load;
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int resume_latency = dev_pm_qos_raw_read_value(device);
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ktime_t delta_next;
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if (data->needs_update) {
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menu_update(drv, dev);
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@ -303,11 +307,13 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
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latency_req = resume_latency;
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/* Special case when user has set very strict latency requirement */
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if (unlikely(latency_req == 0))
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if (unlikely(latency_req == 0)) {
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*stop_tick = false;
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return 0;
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}
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/* determine the expected residency time, round up */
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data->next_timer_us = ktime_to_us(tick_nohz_get_sleep_length());
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data->next_timer_us = ktime_to_us(tick_nohz_get_sleep_length(&delta_next));
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get_iowait_load(&nr_iowaiters, &cpu_load);
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data->bucket = which_bucket(data->next_timer_us, nr_iowaiters);
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@ -346,14 +352,30 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
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*/
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data->predicted_us = min(data->predicted_us, expected_interval);
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/*
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* Use the performance multiplier and the user-configurable
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* latency_req to determine the maximum exit latency.
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*/
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interactivity_req = data->predicted_us / performance_multiplier(nr_iowaiters, cpu_load);
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if (latency_req > interactivity_req)
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latency_req = interactivity_req;
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if (tick_nohz_tick_stopped()) {
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/*
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* If the tick is already stopped, the cost of possible short
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* idle duration misprediction is much higher, because the CPU
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* may be stuck in a shallow idle state for a long time as a
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* result of it. In that case say we might mispredict and try
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* to force the CPU into a state for which we would have stopped
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* the tick, unless a timer is going to expire really soon
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* anyway.
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*/
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if (data->predicted_us < TICK_USEC)
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data->predicted_us = min_t(unsigned int, TICK_USEC,
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ktime_to_us(delta_next));
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} else {
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/*
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* Use the performance multiplier and the user-configurable
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* latency_req to determine the maximum exit latency.
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*/
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interactivity_req = data->predicted_us / performance_multiplier(nr_iowaiters, cpu_load);
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if (latency_req > interactivity_req)
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latency_req = interactivity_req;
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}
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expected_interval = data->predicted_us;
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/*
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* Find the idle state with the lowest power while satisfying
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* our constraints.
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@ -369,15 +391,52 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
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idx = i; /* first enabled state */
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if (s->target_residency > data->predicted_us)
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break;
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if (s->exit_latency > latency_req)
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if (s->exit_latency > latency_req) {
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/*
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* If we break out of the loop for latency reasons, use
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* the target residency of the selected state as the
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* expected idle duration so that the tick is retained
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* as long as that target residency is low enough.
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*/
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expected_interval = drv->states[idx].target_residency;
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break;
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}
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idx = i;
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}
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if (idx == -1)
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idx = 0; /* No states enabled. Must use 0. */
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/*
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* Don't stop the tick if the selected state is a polling one or if the
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* expected idle duration is shorter than the tick period length.
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*/
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if ((drv->states[idx].flags & CPUIDLE_FLAG_POLLING) ||
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expected_interval < TICK_USEC) {
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unsigned int delta_next_us = ktime_to_us(delta_next);
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*stop_tick = false;
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if (!tick_nohz_tick_stopped() && idx > 0 &&
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drv->states[idx].target_residency > delta_next_us) {
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/*
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* The tick is not going to be stopped and the target
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* residency of the state to be returned is not within
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* the time until the next timer event including the
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* tick, so try to correct that.
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*/
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for (i = idx - 1; i >= 0; i--) {
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if (drv->states[i].disabled ||
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dev->states_usage[i].disable)
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continue;
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idx = i;
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if (drv->states[i].target_residency <= delta_next_us)
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break;
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}
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}
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}
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data->last_state_idx = idx;
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return data->last_state_idx;
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@ -397,6 +456,7 @@ static void menu_reflect(struct cpuidle_device *dev, int index)
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data->last_state_idx = index;
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data->needs_update = 1;
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data->tick_wakeup = tick_nohz_idle_got_tick();
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}
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/**
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@ -427,14 +487,27 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev)
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* assume the state was never reached and the exit latency is 0.
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*/
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/* measured value */
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measured_us = cpuidle_get_last_residency(dev);
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if (data->tick_wakeup && data->next_timer_us > TICK_USEC) {
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/*
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* The nohz code said that there wouldn't be any events within
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* the tick boundary (if the tick was stopped), but the idle
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* duration predictor had a differing opinion. Since the CPU
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* was woken up by a tick (that wasn't stopped after all), the
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* predictor was not quite right, so assume that the CPU could
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* have been idle long (but not forever) to help the idle
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* duration predictor do a better job next time.
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*/
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measured_us = 9 * MAX_INTERESTING / 10;
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} else {
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/* measured value */
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measured_us = cpuidle_get_last_residency(dev);
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/* Deduct exit latency */
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if (measured_us > 2 * target->exit_latency)
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measured_us -= target->exit_latency;
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else
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measured_us /= 2;
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/* Deduct exit latency */
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if (measured_us > 2 * target->exit_latency)
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measured_us -= target->exit_latency;
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else
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measured_us /= 2;
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}
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/* Make sure our coefficients do not exceed unity */
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if (measured_us > data->next_timer_us)
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|
|
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|
|
@ -375,7 +375,7 @@ static int efx_mcdi_poll(struct efx_nic *efx)
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* because generally mcdi responses are fast. After that, back off
|
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* and poll once a jiffy (approximately)
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*/
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spins = TICK_USEC;
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spins = USER_TICK_USEC;
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finish = jiffies + MCDI_RPC_TIMEOUT;
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|
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while (1) {
|
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|
|
|
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|
|
@ -135,7 +135,8 @@ extern bool cpuidle_not_available(struct cpuidle_driver *drv,
|
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struct cpuidle_device *dev);
|
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|
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extern int cpuidle_select(struct cpuidle_driver *drv,
|
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struct cpuidle_device *dev);
|
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struct cpuidle_device *dev,
|
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bool *stop_tick);
|
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extern int cpuidle_enter(struct cpuidle_driver *drv,
|
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struct cpuidle_device *dev, int index);
|
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extern void cpuidle_reflect(struct cpuidle_device *dev, int index);
|
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|
|
@ -167,7 +168,7 @@ static inline bool cpuidle_not_available(struct cpuidle_driver *drv,
|
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struct cpuidle_device *dev)
|
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{return true; }
|
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static inline int cpuidle_select(struct cpuidle_driver *drv,
|
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struct cpuidle_device *dev)
|
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struct cpuidle_device *dev, bool *stop_tick)
|
||||
{return -ENODEV; }
|
||||
static inline int cpuidle_enter(struct cpuidle_driver *drv,
|
||||
struct cpuidle_device *dev, int index)
|
||||
|
|
@ -250,7 +251,8 @@ struct cpuidle_governor {
|
|||
struct cpuidle_device *dev);
|
||||
|
||||
int (*select) (struct cpuidle_driver *drv,
|
||||
struct cpuidle_device *dev);
|
||||
struct cpuidle_device *dev,
|
||||
bool *stop_tick);
|
||||
void (*reflect) (struct cpuidle_device *dev, int index);
|
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};
|
||||
|
||||
|
|
|
|||
|
|
@ -424,6 +424,7 @@ static inline ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
|
|||
}
|
||||
|
||||
extern u64 hrtimer_get_next_event(void);
|
||||
extern u64 hrtimer_next_event_without(const struct hrtimer *exclude);
|
||||
|
||||
extern bool hrtimer_active(const struct hrtimer *timer);
|
||||
|
||||
|
|
|
|||
|
|
@ -62,8 +62,11 @@ extern int register_refined_jiffies(long clock_tick_rate);
|
|||
/* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */
|
||||
#define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ)
|
||||
|
||||
/* TICK_USEC is the time between ticks in usec assuming fake USER_HZ */
|
||||
#define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
|
||||
/* TICK_USEC is the time between ticks in usec assuming SHIFTED_HZ */
|
||||
#define TICK_USEC ((USEC_PER_SEC + HZ/2) / HZ)
|
||||
|
||||
/* USER_TICK_USEC is the time between ticks in usec assuming fake USER_HZ */
|
||||
#define USER_TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
|
||||
|
||||
#ifndef __jiffy_arch_data
|
||||
#define __jiffy_arch_data
|
||||
|
|
|
|||
|
|
@ -115,27 +115,46 @@ enum tick_dep_bits {
|
|||
extern bool tick_nohz_enabled;
|
||||
extern bool tick_nohz_tick_stopped(void);
|
||||
extern bool tick_nohz_tick_stopped_cpu(int cpu);
|
||||
extern void tick_nohz_idle_stop_tick(void);
|
||||
extern void tick_nohz_idle_retain_tick(void);
|
||||
extern void tick_nohz_idle_restart_tick(void);
|
||||
extern void tick_nohz_idle_enter(void);
|
||||
extern void tick_nohz_idle_exit(void);
|
||||
extern void tick_nohz_irq_exit(void);
|
||||
extern ktime_t tick_nohz_get_sleep_length(void);
|
||||
extern bool tick_nohz_idle_got_tick(void);
|
||||
extern ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next);
|
||||
extern unsigned long tick_nohz_get_idle_calls(void);
|
||||
extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu);
|
||||
extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
|
||||
extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
|
||||
|
||||
static inline void tick_nohz_idle_stop_tick_protected(void)
|
||||
{
|
||||
local_irq_disable();
|
||||
tick_nohz_idle_stop_tick();
|
||||
local_irq_enable();
|
||||
}
|
||||
|
||||
#else /* !CONFIG_NO_HZ_COMMON */
|
||||
#define tick_nohz_enabled (0)
|
||||
static inline int tick_nohz_tick_stopped(void) { return 0; }
|
||||
static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; }
|
||||
static inline void tick_nohz_idle_stop_tick(void) { }
|
||||
static inline void tick_nohz_idle_retain_tick(void) { }
|
||||
static inline void tick_nohz_idle_restart_tick(void) { }
|
||||
static inline void tick_nohz_idle_enter(void) { }
|
||||
static inline void tick_nohz_idle_exit(void) { }
|
||||
static inline bool tick_nohz_idle_got_tick(void) { return false; }
|
||||
|
||||
static inline ktime_t tick_nohz_get_sleep_length(void)
|
||||
static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
|
||||
{
|
||||
return NSEC_PER_SEC / HZ;
|
||||
*delta_next = TICK_NSEC;
|
||||
return *delta_next;
|
||||
}
|
||||
static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
|
||||
static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
|
||||
|
||||
static inline void tick_nohz_idle_stop_tick_protected(void) { }
|
||||
#endif /* !CONFIG_NO_HZ_COMMON */
|
||||
|
||||
#ifdef CONFIG_NO_HZ_FULL
|
||||
|
|
|
|||
|
|
@ -295,6 +295,7 @@ int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
|
|||
* changed
|
||||
*/
|
||||
plist_del(node, &c->list);
|
||||
/* fall through */
|
||||
case PM_QOS_ADD_REQ:
|
||||
plist_node_init(node, new_value);
|
||||
plist_add(node, &c->list);
|
||||
|
|
@ -367,6 +368,7 @@ bool pm_qos_update_flags(struct pm_qos_flags *pqf,
|
|||
break;
|
||||
case PM_QOS_UPDATE_REQ:
|
||||
pm_qos_flags_remove_req(pqf, req);
|
||||
/* fall through */
|
||||
case PM_QOS_ADD_REQ:
|
||||
req->flags = val;
|
||||
INIT_LIST_HEAD(&req->node);
|
||||
|
|
|
|||
|
|
@ -141,13 +141,15 @@ static void cpuidle_idle_call(void)
|
|||
}
|
||||
|
||||
/*
|
||||
* Tell the RCU framework we are entering an idle section,
|
||||
* so no more rcu read side critical sections and one more
|
||||
* The RCU framework needs to be told that we are entering an idle
|
||||
* section, so no more rcu read side critical sections and one more
|
||||
* step to the grace period
|
||||
*/
|
||||
rcu_idle_enter();
|
||||
|
||||
if (cpuidle_not_available(drv, dev)) {
|
||||
tick_nohz_idle_stop_tick();
|
||||
rcu_idle_enter();
|
||||
|
||||
default_idle_call();
|
||||
goto exit_idle;
|
||||
}
|
||||
|
|
@ -164,20 +166,37 @@ static void cpuidle_idle_call(void)
|
|||
|
||||
if (idle_should_enter_s2idle() || dev->use_deepest_state) {
|
||||
if (idle_should_enter_s2idle()) {
|
||||
rcu_idle_enter();
|
||||
|
||||
entered_state = cpuidle_enter_s2idle(drv, dev);
|
||||
if (entered_state > 0) {
|
||||
local_irq_enable();
|
||||
goto exit_idle;
|
||||
}
|
||||
|
||||
rcu_idle_exit();
|
||||
}
|
||||
|
||||
tick_nohz_idle_stop_tick();
|
||||
rcu_idle_enter();
|
||||
|
||||
next_state = cpuidle_find_deepest_state(drv, dev);
|
||||
call_cpuidle(drv, dev, next_state);
|
||||
} else {
|
||||
bool stop_tick = true;
|
||||
|
||||
/*
|
||||
* Ask the cpuidle framework to choose a convenient idle state.
|
||||
*/
|
||||
next_state = cpuidle_select(drv, dev);
|
||||
next_state = cpuidle_select(drv, dev, &stop_tick);
|
||||
|
||||
if (stop_tick)
|
||||
tick_nohz_idle_stop_tick();
|
||||
else
|
||||
tick_nohz_idle_retain_tick();
|
||||
|
||||
rcu_idle_enter();
|
||||
|
||||
entered_state = call_cpuidle(drv, dev, next_state);
|
||||
/*
|
||||
* Give the governor an opportunity to reflect on the outcome
|
||||
|
|
@ -222,6 +241,7 @@ static void do_idle(void)
|
|||
rmb();
|
||||
|
||||
if (cpu_is_offline(cpu)) {
|
||||
tick_nohz_idle_stop_tick_protected();
|
||||
cpuhp_report_idle_dead();
|
||||
arch_cpu_idle_dead();
|
||||
}
|
||||
|
|
@ -235,10 +255,12 @@ static void do_idle(void)
|
|||
* broadcast device expired for us, we don't want to go deep
|
||||
* idle as we know that the IPI is going to arrive right away.
|
||||
*/
|
||||
if (cpu_idle_force_poll || tick_check_broadcast_expired())
|
||||
if (cpu_idle_force_poll || tick_check_broadcast_expired()) {
|
||||
tick_nohz_idle_restart_tick();
|
||||
cpu_idle_poll();
|
||||
else
|
||||
} else {
|
||||
cpuidle_idle_call();
|
||||
}
|
||||
arch_cpu_idle_exit();
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -480,6 +480,7 @@ __next_base(struct hrtimer_cpu_base *cpu_base, unsigned int *active)
|
|||
while ((base = __next_base((cpu_base), &(active))))
|
||||
|
||||
static ktime_t __hrtimer_next_event_base(struct hrtimer_cpu_base *cpu_base,
|
||||
const struct hrtimer *exclude,
|
||||
unsigned int active,
|
||||
ktime_t expires_next)
|
||||
{
|
||||
|
|
@ -492,9 +493,22 @@ static ktime_t __hrtimer_next_event_base(struct hrtimer_cpu_base *cpu_base,
|
|||
|
||||
next = timerqueue_getnext(&base->active);
|
||||
timer = container_of(next, struct hrtimer, node);
|
||||
if (timer == exclude) {
|
||||
/* Get to the next timer in the queue. */
|
||||
next = timerqueue_iterate_next(next);
|
||||
if (!next)
|
||||
continue;
|
||||
|
||||
timer = container_of(next, struct hrtimer, node);
|
||||
}
|
||||
expires = ktime_sub(hrtimer_get_expires(timer), base->offset);
|
||||
if (expires < expires_next) {
|
||||
expires_next = expires;
|
||||
|
||||
/* Skip cpu_base update if a timer is being excluded. */
|
||||
if (exclude)
|
||||
continue;
|
||||
|
||||
if (timer->is_soft)
|
||||
cpu_base->softirq_next_timer = timer;
|
||||
else
|
||||
|
|
@ -538,7 +552,8 @@ __hrtimer_get_next_event(struct hrtimer_cpu_base *cpu_base, unsigned int active_
|
|||
if (!cpu_base->softirq_activated && (active_mask & HRTIMER_ACTIVE_SOFT)) {
|
||||
active = cpu_base->active_bases & HRTIMER_ACTIVE_SOFT;
|
||||
cpu_base->softirq_next_timer = NULL;
|
||||
expires_next = __hrtimer_next_event_base(cpu_base, active, KTIME_MAX);
|
||||
expires_next = __hrtimer_next_event_base(cpu_base, NULL,
|
||||
active, KTIME_MAX);
|
||||
|
||||
next_timer = cpu_base->softirq_next_timer;
|
||||
}
|
||||
|
|
@ -546,7 +561,8 @@ __hrtimer_get_next_event(struct hrtimer_cpu_base *cpu_base, unsigned int active_
|
|||
if (active_mask & HRTIMER_ACTIVE_HARD) {
|
||||
active = cpu_base->active_bases & HRTIMER_ACTIVE_HARD;
|
||||
cpu_base->next_timer = next_timer;
|
||||
expires_next = __hrtimer_next_event_base(cpu_base, active, expires_next);
|
||||
expires_next = __hrtimer_next_event_base(cpu_base, NULL, active,
|
||||
expires_next);
|
||||
}
|
||||
|
||||
return expires_next;
|
||||
|
|
@ -1190,6 +1206,39 @@ u64 hrtimer_get_next_event(void)
|
|||
|
||||
return expires;
|
||||
}
|
||||
|
||||
/**
|
||||
* hrtimer_next_event_without - time until next expiry event w/o one timer
|
||||
* @exclude: timer to exclude
|
||||
*
|
||||
* Returns the next expiry time over all timers except for the @exclude one or
|
||||
* KTIME_MAX if none of them is pending.
|
||||
*/
|
||||
u64 hrtimer_next_event_without(const struct hrtimer *exclude)
|
||||
{
|
||||
struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
|
||||
u64 expires = KTIME_MAX;
|
||||
unsigned long flags;
|
||||
|
||||
raw_spin_lock_irqsave(&cpu_base->lock, flags);
|
||||
|
||||
if (__hrtimer_hres_active(cpu_base)) {
|
||||
unsigned int active;
|
||||
|
||||
if (!cpu_base->softirq_activated) {
|
||||
active = cpu_base->active_bases & HRTIMER_ACTIVE_SOFT;
|
||||
expires = __hrtimer_next_event_base(cpu_base, exclude,
|
||||
active, KTIME_MAX);
|
||||
}
|
||||
active = cpu_base->active_bases & HRTIMER_ACTIVE_HARD;
|
||||
expires = __hrtimer_next_event_base(cpu_base, exclude, active,
|
||||
expires);
|
||||
}
|
||||
|
||||
raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
|
||||
|
||||
return expires;
|
||||
}
|
||||
#endif
|
||||
|
||||
static inline int hrtimer_clockid_to_base(clockid_t clock_id)
|
||||
|
|
|
|||
|
|
@ -31,7 +31,7 @@
|
|||
|
||||
|
||||
/* USER_HZ period (usecs): */
|
||||
unsigned long tick_usec = TICK_USEC;
|
||||
unsigned long tick_usec = USER_TICK_USEC;
|
||||
|
||||
/* SHIFTED_HZ period (nsecs): */
|
||||
unsigned long tick_nsec;
|
||||
|
|
|
|||
|
|
@ -122,8 +122,7 @@ static ktime_t tick_init_jiffy_update(void)
|
|||
return period;
|
||||
}
|
||||
|
||||
|
||||
static void tick_sched_do_timer(ktime_t now)
|
||||
static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)
|
||||
{
|
||||
int cpu = smp_processor_id();
|
||||
|
||||
|
|
@ -143,6 +142,9 @@ static void tick_sched_do_timer(ktime_t now)
|
|||
/* Check, if the jiffies need an update */
|
||||
if (tick_do_timer_cpu == cpu)
|
||||
tick_do_update_jiffies64(now);
|
||||
|
||||
if (ts->inidle)
|
||||
ts->got_idle_tick = 1;
|
||||
}
|
||||
|
||||
static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
|
||||
|
|
@ -474,7 +476,9 @@ __setup("nohz=", setup_tick_nohz);
|
|||
|
||||
bool tick_nohz_tick_stopped(void)
|
||||
{
|
||||
return __this_cpu_read(tick_cpu_sched.tick_stopped);
|
||||
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
|
||||
|
||||
return ts->tick_stopped;
|
||||
}
|
||||
|
||||
bool tick_nohz_tick_stopped_cpu(int cpu)
|
||||
|
|
@ -537,14 +541,11 @@ static void tick_nohz_stop_idle(struct tick_sched *ts, ktime_t now)
|
|||
sched_clock_idle_wakeup_event();
|
||||
}
|
||||
|
||||
static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
|
||||
static void tick_nohz_start_idle(struct tick_sched *ts)
|
||||
{
|
||||
ktime_t now = ktime_get();
|
||||
|
||||
ts->idle_entrytime = now;
|
||||
ts->idle_entrytime = ktime_get();
|
||||
ts->idle_active = 1;
|
||||
sched_clock_idle_sleep_event();
|
||||
return now;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -653,13 +654,10 @@ static inline bool local_timer_softirq_pending(void)
|
|||
return local_softirq_pending() & TIMER_SOFTIRQ;
|
||||
}
|
||||
|
||||
static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
|
||||
ktime_t now, int cpu)
|
||||
static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)
|
||||
{
|
||||
struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
|
||||
u64 basemono, next_tick, next_tmr, next_rcu, delta, expires;
|
||||
unsigned long seq, basejiff;
|
||||
ktime_t tick;
|
||||
|
||||
/* Read jiffies and the time when jiffies were updated last */
|
||||
do {
|
||||
|
|
@ -668,6 +666,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
|
|||
basejiff = jiffies;
|
||||
} while (read_seqretry(&jiffies_lock, seq));
|
||||
ts->last_jiffies = basejiff;
|
||||
ts->timer_expires_base = basemono;
|
||||
|
||||
/*
|
||||
* Keep the periodic tick, when RCU, architecture or irq_work
|
||||
|
|
@ -712,32 +711,20 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
|
|||
* next period, so no point in stopping it either, bail.
|
||||
*/
|
||||
if (!ts->tick_stopped) {
|
||||
tick = 0;
|
||||
ts->timer_expires = 0;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* If this CPU is the one which updates jiffies, then give up
|
||||
* the assignment and let it be taken by the CPU which runs
|
||||
* the tick timer next, which might be this CPU as well. If we
|
||||
* don't drop this here the jiffies might be stale and
|
||||
* do_timer() never invoked. Keep track of the fact that it
|
||||
* was the one which had the do_timer() duty last. If this CPU
|
||||
* is the one which had the do_timer() duty last, we limit the
|
||||
* sleep time to the timekeeping max_deferment value.
|
||||
* If this CPU is the one which had the do_timer() duty last, we limit
|
||||
* the sleep time to the timekeeping max_deferment value.
|
||||
* Otherwise we can sleep as long as we want.
|
||||
*/
|
||||
delta = timekeeping_max_deferment();
|
||||
if (cpu == tick_do_timer_cpu) {
|
||||
tick_do_timer_cpu = TICK_DO_TIMER_NONE;
|
||||
ts->do_timer_last = 1;
|
||||
} else if (tick_do_timer_cpu != TICK_DO_TIMER_NONE) {
|
||||
if (cpu != tick_do_timer_cpu &&
|
||||
(tick_do_timer_cpu != TICK_DO_TIMER_NONE || !ts->do_timer_last))
|
||||
delta = KTIME_MAX;
|
||||
ts->do_timer_last = 0;
|
||||
} else if (!ts->do_timer_last) {
|
||||
delta = KTIME_MAX;
|
||||
}
|
||||
|
||||
/* Calculate the next expiry time */
|
||||
if (delta < (KTIME_MAX - basemono))
|
||||
|
|
@ -745,14 +732,42 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
|
|||
else
|
||||
expires = KTIME_MAX;
|
||||
|
||||
expires = min_t(u64, expires, next_tick);
|
||||
tick = expires;
|
||||
ts->timer_expires = min_t(u64, expires, next_tick);
|
||||
|
||||
out:
|
||||
return ts->timer_expires;
|
||||
}
|
||||
|
||||
static void tick_nohz_stop_tick(struct tick_sched *ts, int cpu)
|
||||
{
|
||||
struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
|
||||
u64 basemono = ts->timer_expires_base;
|
||||
u64 expires = ts->timer_expires;
|
||||
ktime_t tick = expires;
|
||||
|
||||
/* Make sure we won't be trying to stop it twice in a row. */
|
||||
ts->timer_expires_base = 0;
|
||||
|
||||
/*
|
||||
* If this CPU is the one which updates jiffies, then give up
|
||||
* the assignment and let it be taken by the CPU which runs
|
||||
* the tick timer next, which might be this CPU as well. If we
|
||||
* don't drop this here the jiffies might be stale and
|
||||
* do_timer() never invoked. Keep track of the fact that it
|
||||
* was the one which had the do_timer() duty last.
|
||||
*/
|
||||
if (cpu == tick_do_timer_cpu) {
|
||||
tick_do_timer_cpu = TICK_DO_TIMER_NONE;
|
||||
ts->do_timer_last = 1;
|
||||
} else if (tick_do_timer_cpu != TICK_DO_TIMER_NONE) {
|
||||
ts->do_timer_last = 0;
|
||||
}
|
||||
|
||||
/* Skip reprogram of event if its not changed */
|
||||
if (ts->tick_stopped && (expires == ts->next_tick)) {
|
||||
/* Sanity check: make sure clockevent is actually programmed */
|
||||
if (tick == KTIME_MAX || ts->next_tick == hrtimer_get_expires(&ts->sched_timer))
|
||||
goto out;
|
||||
return;
|
||||
|
||||
WARN_ON_ONCE(1);
|
||||
printk_once("basemono: %llu ts->next_tick: %llu dev->next_event: %llu timer->active: %d timer->expires: %llu\n",
|
||||
|
|
@ -786,7 +801,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
|
|||
if (unlikely(expires == KTIME_MAX)) {
|
||||
if (ts->nohz_mode == NOHZ_MODE_HIGHRES)
|
||||
hrtimer_cancel(&ts->sched_timer);
|
||||
goto out;
|
||||
return;
|
||||
}
|
||||
|
||||
hrtimer_set_expires(&ts->sched_timer, tick);
|
||||
|
|
@ -795,15 +810,23 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
|
|||
hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS_PINNED);
|
||||
else
|
||||
tick_program_event(tick, 1);
|
||||
out:
|
||||
/*
|
||||
* Update the estimated sleep length until the next timer
|
||||
* (not only the tick).
|
||||
*/
|
||||
ts->sleep_length = ktime_sub(dev->next_event, now);
|
||||
return tick;
|
||||
}
|
||||
|
||||
static void tick_nohz_retain_tick(struct tick_sched *ts)
|
||||
{
|
||||
ts->timer_expires_base = 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_NO_HZ_FULL
|
||||
static void tick_nohz_stop_sched_tick(struct tick_sched *ts, int cpu)
|
||||
{
|
||||
if (tick_nohz_next_event(ts, cpu))
|
||||
tick_nohz_stop_tick(ts, cpu);
|
||||
else
|
||||
tick_nohz_retain_tick(ts);
|
||||
}
|
||||
#endif /* CONFIG_NO_HZ_FULL */
|
||||
|
||||
static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now)
|
||||
{
|
||||
/* Update jiffies first */
|
||||
|
|
@ -839,7 +862,7 @@ static void tick_nohz_full_update_tick(struct tick_sched *ts)
|
|||
return;
|
||||
|
||||
if (can_stop_full_tick(cpu, ts))
|
||||
tick_nohz_stop_sched_tick(ts, ktime_get(), cpu);
|
||||
tick_nohz_stop_sched_tick(ts, cpu);
|
||||
else if (ts->tick_stopped)
|
||||
tick_nohz_restart_sched_tick(ts, ktime_get());
|
||||
#endif
|
||||
|
|
@ -865,10 +888,8 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
|
|||
return false;
|
||||
}
|
||||
|
||||
if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE)) {
|
||||
ts->sleep_length = NSEC_PER_SEC / HZ;
|
||||
if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))
|
||||
return false;
|
||||
}
|
||||
|
||||
if (need_resched())
|
||||
return false;
|
||||
|
|
@ -903,42 +924,65 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
|
|||
return true;
|
||||
}
|
||||
|
||||
static void __tick_nohz_idle_enter(struct tick_sched *ts)
|
||||
static void __tick_nohz_idle_stop_tick(struct tick_sched *ts)
|
||||
{
|
||||
ktime_t now, expires;
|
||||
ktime_t expires;
|
||||
int cpu = smp_processor_id();
|
||||
|
||||
now = tick_nohz_start_idle(ts);
|
||||
/*
|
||||
* If tick_nohz_get_sleep_length() ran tick_nohz_next_event(), the
|
||||
* tick timer expiration time is known already.
|
||||
*/
|
||||
if (ts->timer_expires_base)
|
||||
expires = ts->timer_expires;
|
||||
else if (can_stop_idle_tick(cpu, ts))
|
||||
expires = tick_nohz_next_event(ts, cpu);
|
||||
else
|
||||
return;
|
||||
|
||||
if (can_stop_idle_tick(cpu, ts)) {
|
||||
ts->idle_calls++;
|
||||
|
||||
if (expires > 0LL) {
|
||||
int was_stopped = ts->tick_stopped;
|
||||
|
||||
ts->idle_calls++;
|
||||
tick_nohz_stop_tick(ts, cpu);
|
||||
|
||||
expires = tick_nohz_stop_sched_tick(ts, now, cpu);
|
||||
if (expires > 0LL) {
|
||||
ts->idle_sleeps++;
|
||||
ts->idle_expires = expires;
|
||||
}
|
||||
ts->idle_sleeps++;
|
||||
ts->idle_expires = expires;
|
||||
|
||||
if (!was_stopped && ts->tick_stopped) {
|
||||
ts->idle_jiffies = ts->last_jiffies;
|
||||
nohz_balance_enter_idle(cpu);
|
||||
}
|
||||
} else {
|
||||
tick_nohz_retain_tick(ts);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* tick_nohz_idle_enter - stop the idle tick from the idle task
|
||||
* tick_nohz_idle_stop_tick - stop the idle tick from the idle task
|
||||
*
|
||||
* When the next event is more than a tick into the future, stop the idle tick
|
||||
*/
|
||||
void tick_nohz_idle_stop_tick(void)
|
||||
{
|
||||
__tick_nohz_idle_stop_tick(this_cpu_ptr(&tick_cpu_sched));
|
||||
}
|
||||
|
||||
void tick_nohz_idle_retain_tick(void)
|
||||
{
|
||||
tick_nohz_retain_tick(this_cpu_ptr(&tick_cpu_sched));
|
||||
/*
|
||||
* Undo the effect of get_next_timer_interrupt() called from
|
||||
* tick_nohz_next_event().
|
||||
*/
|
||||
timer_clear_idle();
|
||||
}
|
||||
|
||||
/**
|
||||
* tick_nohz_idle_enter - prepare for entering idle on the current CPU
|
||||
*
|
||||
* Called when we start the idle loop.
|
||||
*
|
||||
* The arch is responsible of calling:
|
||||
*
|
||||
* - rcu_idle_enter() after its last use of RCU before the CPU is put
|
||||
* to sleep.
|
||||
* - rcu_idle_exit() before the first use of RCU after the CPU is woken up.
|
||||
*/
|
||||
void tick_nohz_idle_enter(void)
|
||||
{
|
||||
|
|
@ -949,8 +993,11 @@ void tick_nohz_idle_enter(void)
|
|||
local_irq_disable();
|
||||
|
||||
ts = this_cpu_ptr(&tick_cpu_sched);
|
||||
|
||||
WARN_ON_ONCE(ts->timer_expires_base);
|
||||
|
||||
ts->inidle = 1;
|
||||
__tick_nohz_idle_enter(ts);
|
||||
tick_nohz_start_idle(ts);
|
||||
|
||||
local_irq_enable();
|
||||
}
|
||||
|
|
@ -968,21 +1015,62 @@ void tick_nohz_irq_exit(void)
|
|||
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
|
||||
|
||||
if (ts->inidle)
|
||||
__tick_nohz_idle_enter(ts);
|
||||
tick_nohz_start_idle(ts);
|
||||
else
|
||||
tick_nohz_full_update_tick(ts);
|
||||
}
|
||||
|
||||
/**
|
||||
* tick_nohz_get_sleep_length - return the length of the current sleep
|
||||
*
|
||||
* Called from power state control code with interrupts disabled
|
||||
* tick_nohz_idle_got_tick - Check whether or not the tick handler has run
|
||||
*/
|
||||
ktime_t tick_nohz_get_sleep_length(void)
|
||||
bool tick_nohz_idle_got_tick(void)
|
||||
{
|
||||
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
|
||||
|
||||
return ts->sleep_length;
|
||||
if (ts->got_idle_tick) {
|
||||
ts->got_idle_tick = 0;
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* tick_nohz_get_sleep_length - return the expected length of the current sleep
|
||||
* @delta_next: duration until the next event if the tick cannot be stopped
|
||||
*
|
||||
* Called from power state control code with interrupts disabled
|
||||
*/
|
||||
ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
|
||||
{
|
||||
struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
|
||||
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
|
||||
int cpu = smp_processor_id();
|
||||
/*
|
||||
* The idle entry time is expected to be a sufficient approximation of
|
||||
* the current time at this point.
|
||||
*/
|
||||
ktime_t now = ts->idle_entrytime;
|
||||
ktime_t next_event;
|
||||
|
||||
WARN_ON_ONCE(!ts->inidle);
|
||||
|
||||
*delta_next = ktime_sub(dev->next_event, now);
|
||||
|
||||
if (!can_stop_idle_tick(cpu, ts))
|
||||
return *delta_next;
|
||||
|
||||
next_event = tick_nohz_next_event(ts, cpu);
|
||||
if (!next_event)
|
||||
return *delta_next;
|
||||
|
||||
/*
|
||||
* If the next highres timer to expire is earlier than next_event, the
|
||||
* idle governor needs to know that.
|
||||
*/
|
||||
next_event = min_t(u64, next_event,
|
||||
hrtimer_next_event_without(&ts->sched_timer));
|
||||
|
||||
return ktime_sub(next_event, now);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -1031,6 +1119,20 @@ static void tick_nohz_account_idle_ticks(struct tick_sched *ts)
|
|||
#endif
|
||||
}
|
||||
|
||||
static void __tick_nohz_idle_restart_tick(struct tick_sched *ts, ktime_t now)
|
||||
{
|
||||
tick_nohz_restart_sched_tick(ts, now);
|
||||
tick_nohz_account_idle_ticks(ts);
|
||||
}
|
||||
|
||||
void tick_nohz_idle_restart_tick(void)
|
||||
{
|
||||
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
|
||||
|
||||
if (ts->tick_stopped)
|
||||
__tick_nohz_idle_restart_tick(ts, ktime_get());
|
||||
}
|
||||
|
||||
/**
|
||||
* tick_nohz_idle_exit - restart the idle tick from the idle task
|
||||
*
|
||||
|
|
@ -1041,24 +1143,26 @@ static void tick_nohz_account_idle_ticks(struct tick_sched *ts)
|
|||
void tick_nohz_idle_exit(void)
|
||||
{
|
||||
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
|
||||
bool idle_active, tick_stopped;
|
||||
ktime_t now;
|
||||
|
||||
local_irq_disable();
|
||||
|
||||
WARN_ON_ONCE(!ts->inidle);
|
||||
WARN_ON_ONCE(ts->timer_expires_base);
|
||||
|
||||
ts->inidle = 0;
|
||||
idle_active = ts->idle_active;
|
||||
tick_stopped = ts->tick_stopped;
|
||||
|
||||
if (ts->idle_active || ts->tick_stopped)
|
||||
if (idle_active || tick_stopped)
|
||||
now = ktime_get();
|
||||
|
||||
if (ts->idle_active)
|
||||
if (idle_active)
|
||||
tick_nohz_stop_idle(ts, now);
|
||||
|
||||
if (ts->tick_stopped) {
|
||||
tick_nohz_restart_sched_tick(ts, now);
|
||||
tick_nohz_account_idle_ticks(ts);
|
||||
}
|
||||
if (tick_stopped)
|
||||
__tick_nohz_idle_restart_tick(ts, now);
|
||||
|
||||
local_irq_enable();
|
||||
}
|
||||
|
|
@ -1074,7 +1178,7 @@ static void tick_nohz_handler(struct clock_event_device *dev)
|
|||
|
||||
dev->next_event = KTIME_MAX;
|
||||
|
||||
tick_sched_do_timer(now);
|
||||
tick_sched_do_timer(ts, now);
|
||||
tick_sched_handle(ts, regs);
|
||||
|
||||
/* No need to reprogram if we are running tickless */
|
||||
|
|
@ -1169,7 +1273,7 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer)
|
|||
struct pt_regs *regs = get_irq_regs();
|
||||
ktime_t now = ktime_get();
|
||||
|
||||
tick_sched_do_timer(now);
|
||||
tick_sched_do_timer(ts, now);
|
||||
|
||||
/*
|
||||
* Do not call, when we are not in irq context and have
|
||||
|
|
|
|||
|
|
@ -38,31 +38,37 @@ enum tick_nohz_mode {
|
|||
* @idle_exittime: Time when the idle state was left
|
||||
* @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
|
||||
* @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding
|
||||
* @sleep_length: Duration of the current idle sleep
|
||||
* @timer_expires: Anticipated timer expiration time (in case sched tick is stopped)
|
||||
* @timer_expires_base: Base time clock monotonic for @timer_expires
|
||||
* @do_timer_lst: CPU was the last one doing do_timer before going idle
|
||||
* @got_idle_tick: Tick timer function has run with @inidle set
|
||||
*/
|
||||
struct tick_sched {
|
||||
struct hrtimer sched_timer;
|
||||
unsigned long check_clocks;
|
||||
enum tick_nohz_mode nohz_mode;
|
||||
|
||||
unsigned int inidle : 1;
|
||||
unsigned int tick_stopped : 1;
|
||||
unsigned int idle_active : 1;
|
||||
unsigned int do_timer_last : 1;
|
||||
unsigned int got_idle_tick : 1;
|
||||
|
||||
ktime_t last_tick;
|
||||
ktime_t next_tick;
|
||||
int inidle;
|
||||
int tick_stopped;
|
||||
unsigned long idle_jiffies;
|
||||
unsigned long idle_calls;
|
||||
unsigned long idle_sleeps;
|
||||
int idle_active;
|
||||
ktime_t idle_entrytime;
|
||||
ktime_t idle_waketime;
|
||||
ktime_t idle_exittime;
|
||||
ktime_t idle_sleeptime;
|
||||
ktime_t iowait_sleeptime;
|
||||
ktime_t sleep_length;
|
||||
unsigned long last_jiffies;
|
||||
u64 timer_expires;
|
||||
u64 timer_expires_base;
|
||||
u64 next_timer;
|
||||
ktime_t idle_expires;
|
||||
int do_timer_last;
|
||||
atomic_t tick_dep_mask;
|
||||
};
|
||||
|
||||
|
|
|
|||
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