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Commit 1ad74998 authored by Tony Breeds's avatar Tony Breeds Committed by Paul Mackerras
Browse files

[POWERPC] Enable tickless idle and high res timers for powerpc 



Signed-off-by: default avatarTony Breeds <tony@bakeyournoodle.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent d831d0b8

arch/powerpc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -173,6 +173,7 @@ config HIGHMEM 
	bool "High memory support"

	depends on PPC32



source kernel/time/Kconfig

source kernel/Kconfig.hz

source kernel/Kconfig.preempt

source "fs/Kconfig.binfmt"

arch/powerpc/kernel/idle.c

+3 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/smp.h>

#include <linux/cpu.h>

#include <linux/sysctl.h>

#include <linux/tick.h>



#include <asm/system.h>

#include <asm/processor.h>
@@ -59,6 +60,7 @@ void cpu_idle(void) 


	set_thread_flag(TIF_POLLING_NRFLAG);

	while (1) {

		tick_nohz_stop_sched_tick();

		while (!need_resched() && !cpu_should_die()) {

			ppc64_runlatch_off();
@@ -90,6 +92,7 @@ void cpu_idle(void) 


		HMT_medium();

		ppc64_runlatch_on();

		tick_nohz_restart_sched_tick();

		if (cpu_should_die())

			cpu_die();

		preempt_enable_no_resched();

arch/powerpc/platforms/iseries/setup.c

+6 −0
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ 
#include <linux/major.h>

#include <linux/root_dev.h>

#include <linux/kernel.h>

#include <linux/hrtimer.h>

#include <linux/tick.h>



#include <asm/processor.h>

#include <asm/machdep.h>
@@ -561,6 +563,7 @@ static void yield_shared_processor(void) 
static void iseries_shared_idle(void)

{

	while (1) {

		tick_nohz_stop_sched_tick();

		while (!need_resched() && !hvlpevent_is_pending()) {

			local_irq_disable();

			ppc64_runlatch_off();
@@ -574,6 +577,7 @@ static void iseries_shared_idle(void) 
		}



		ppc64_runlatch_on();

		tick_nohz_restart_sched_tick();



		if (hvlpevent_is_pending())

			process_iSeries_events();
@@ -589,6 +593,7 @@ static void iseries_dedicated_idle(void) 
	set_thread_flag(TIF_POLLING_NRFLAG);



	while (1) {

		tick_nohz_stop_sched_tick();

		if (!need_resched()) {

			while (!need_resched()) {

				ppc64_runlatch_off();
@@ -605,6 +610,7 @@ static void iseries_dedicated_idle(void) 
		}



		ppc64_runlatch_on();

		tick_nohz_restart_sched_tick();

		preempt_enable_no_resched();

		schedule();

		preempt_disable();