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Commit 342c8ec5 authored by Kazuki H's avatar Kazuki H Committed by Pranav Vashi
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sched/idle: Enter wfi state instead of polling during active migration 



WFI's wakeup latency is low enough, use that instead of polling and
burning power.

Change-Id: Iee1c1cdf515224267925037a859c6a74fc61abb7
Signed-off-by: default avatarKazuki H <kazukih0205@gmail.com>
Signed-off-by: default avatarAlexander Winkowski <dereference23@outlook.com>
Signed-off-by: default avatarPranav Vashi <neobuddy89@gmail.com>
parent ab3b8b1b

drivers/cpuidle/lpm-levels.c

+3 −1
Original line number Diff line number Diff line
@@ -51,6 +51,7 @@ 
#elif defined(CONFIG_COMMON_CLK_MSM)

#include "../../drivers/clk/msm/clock.h"

#endif /* CONFIG_COMMON_CLK */

#include "../../kernel/sched/sched.h"

#define CREATE_TRACE_POINTS

#include <trace/events/trace_msm_low_power.h>
@@ -640,7 +641,8 @@ static int cpu_power_select(struct cpuidle_device *dev, 
	struct power_params *pwr_params;

	uint64_t bias_time = 0;



	if ((sleep_disabled && !cpu_isolated(dev->cpu)) || sleep_us < 0)

	if ((sleep_disabled && !cpu_isolated(dev->cpu)) ||

	    is_reserved(dev->cpu) || sleep_us < 0)

		return best_level;



	idx_restrict = cpu->nlevels + 1;

kernel/sched/idle.c

+2 −4
Original line number Diff line number Diff line
@@ -66,8 +66,7 @@ static noinline int __cpuidle cpu_idle_poll(void) 
	local_irq_enable();

	stop_critical_timings();

	while (!tif_need_resched() &&

		(cpu_idle_force_poll || tick_check_broadcast_expired() ||

		is_reserved(smp_processor_id())))

		(cpu_idle_force_poll || tick_check_broadcast_expired()))

		cpu_relax();

	start_critical_timings();

	trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
@@ -263,8 +262,7 @@ 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() ||

				is_reserved(smp_processor_id())) {

		if (cpu_idle_force_poll || tick_check_broadcast_expired()) {

			tick_nohz_idle_restart_tick();

			cpu_idle_poll();

		} else {