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ACPI / cpuidle: Drop unnecessary calls from ->enter callback routines 

acpi_idle_enter_simple() and acpi_idle_enter_bm() don't need to
call sched_clock_idle_sleep/wakeup_event(), because that's taken
care of by the core already.  Namely, sched_clock_idle_sleep_event()
is called by tick_nohz_start_idle() called by __tick_nohz_idle_enter()
which in turn is called by tick_nohz_idle_enter() and that is called
by cpu_idle_loop().  Analogously for sched_clock_idle_wakeup_event().

For this reason, drop those calls from the ACPI cpuidle driver's
->enter callback routines.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2015-02-02 23:55:17 +01:00
parent b00783fd90
commit 67f592c8f6
1 changed files with 0 additions and 8 deletions
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8
drivers/acpi/processor_idle.c
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@ -791,12 +791,8 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
if (cx->type == ACPI_STATE_C3)
ACPI_FLUSH_CPU_CACHE();
/* Tell the scheduler that we are going deep-idle: */
sched_clock_idle_sleep_event();
acpi_idle_do_entry(cx);
sched_clock_idle_wakeup_event(0);
lapic_timer_state_broadcast(pr, cx, 0);
return index;
}
@ -842,8 +838,6 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
acpi_unlazy_tlb(smp_processor_id());
/* Tell the scheduler that we are going deep-idle: */
sched_clock_idle_sleep_event();
/*
* Must be done before busmaster disable as we might need to
* access HPET !
@ -881,8 +875,6 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
raw_spin_unlock(&c3_lock);
}
sched_clock_idle_wakeup_event(0);
lapic_timer_state_broadcast(pr, cx, 0);
return index;
}