/**
* tick_nohz_idle_enter - stop the idle tick from the idle task
*
* When the next event is more than a tick into the future, stop the idle tick
* 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)
{
struct tick_sched *ts;
WARN_ON_ONCE(irqs_disabled());
/*
* Update the idle state in the scheduler domain hierarchy
* when tick_nohz_stop_sched_tick() is called from the idle loop.
* State will be updated to busy during the first busy tick after
* exiting idle.
*/
set_cpu_sd_state_idle();
local_irq_disable();
ts = &__get_cpu_var(tick_cpu_sched);
/*
* set ts->inidle unconditionally. even if the system did not
* switch to nohz mode the cpu frequency governers rely on the
* update of the idle time accounting in tick_nohz_start_idle().
*/
ts->inidle = 1;
tick_nohz_stop_sched_tick(ts);
local_irq_enable();
}
void tick_nohz_idle_enter(void)
{
struct tick_sched *ts;
WARN_ON_ONCE(irqs_disabled());
set_cpu_sd_state_idle();
local_irq_disable();
ts = &__get_cpu_var(tick_cpu_sched);
ts->inidle = 1;
tick_nohz_stop_sched_tick(ts);
local_irq_enable();
}
