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

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Tony Breeds 2007-09-21 13:26:03 +10:00 committed by Paul Mackerras
parent d831d0b83f
commit 1ad749980a
3 changed files with 10 additions and 0 deletions
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1
arch/powerpc/Kconfig
View File

@ -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"

3
arch/powerpc/kernel/idle.c
View File

@ -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();

6
arch/powerpc/platforms/iseries/setup.c
View File

@ -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();