Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit bceefad5 authored by Venkatesh Pallipadi's avatar Venkatesh Pallipadi Committed by Len Brown
Browse files

ACPI: Eliminate us to pm ticks conversion in common path 



acpi_enter_[simple|bm] routines does us to pm tick conversion on every
idle wakeup and the value is only used in /proc/acpi display. We can
store the time in us and convert it into pm ticks before printing instead and
avoid the conversion in the common path.

Signed-off-by: default avatarVenkatesh Pallipadi <venki@google.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 157317ba

drivers/acpi/processor_idle.c

+5 −10
Original line number Diff line number Diff line
@@ -80,7 +80,7 @@ module_param(nocst, uint, 0000); 
static unsigned int latency_factor __read_mostly = 2;

module_param(latency_factor, uint, 0644);



static s64 us_to_pm_timer_ticks(s64 t)

static u64 us_to_pm_timer_ticks(s64 t)

{

	return div64_u64(t * PM_TIMER_FREQUENCY, 1000000);

}
@@ -731,10 +731,10 @@ static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) 


		seq_puts(seq, "demotion[--] ");



		seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",

		seq_printf(seq, "latency[%03d] usage[%08d] duration[%020Lu]\n",

			   pr->power.states[i].latency,

			   pr->power.states[i].usage,

			   (unsigned long long)pr->power.states[i].time);

			   us_to_pm_timer_ticks(pr->power.states[i].time));

	}



      end:
@@ -861,7 +861,6 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev, 
	ktime_t  kt1, kt2;

	s64 idle_time_ns;

	s64 idle_time;

	s64 sleep_ticks = 0;



	pr = __get_cpu_var(processors);
@@ -906,8 +905,6 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev, 
	idle_time = idle_time_ns;

	do_div(idle_time, NSEC_PER_USEC);



	sleep_ticks = us_to_pm_timer_ticks(idle_time);



	/* Tell the scheduler how much we idled: */

	sched_clock_idle_wakeup_event(idle_time_ns);
@@ -918,7 +915,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev, 
	cx->usage++;



	lapic_timer_state_broadcast(pr, cx, 0);

	cx->time += sleep_ticks;

	cx->time += idle_time;

	return idle_time;

}
@@ -940,7 +937,6 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, 
	ktime_t  kt1, kt2;

	s64 idle_time_ns;

	s64 idle_time;

	s64 sleep_ticks = 0;





	pr = __get_cpu_var(processors);
@@ -1026,7 +1022,6 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, 
	idle_time = idle_time_ns;

	do_div(idle_time, NSEC_PER_USEC);



	sleep_ticks = us_to_pm_timer_ticks(idle_time);

	/* Tell the scheduler how much we idled: */

	sched_clock_idle_wakeup_event(idle_time_ns);
@@ -1037,7 +1032,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev, 
	cx->usage++;



	lapic_timer_state_broadcast(pr, cx, 0);

	cx->time += sleep_ticks;

	cx->time += idle_time;

	return idle_time;

}