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authorTony Breeds <tony@bakeyournoodle.com>2007-09-21 13:26:03 +1000
committerPaul Mackerras <paulus@samba.org>2007-10-03 15:44:34 +1000
commit1ad749980a5fda46f7ec920d8409ddcc89b38714 (patch)
tree3c1b28f1f6e03660c36e6f320fce54e4e5a1eb5e /arch
parentd831d0b83f205888f4be4dee0a074ad67ef809b3 (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/Kconfig1
-rw-r--r--arch/powerpc/kernel/idle.c3
-rw-r--r--arch/powerpc/platforms/iseries/setup.c6
3 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a46f8116f47..b387e1ed517 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -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"
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
index a9e9cbd3297..abd2957fe53 100644
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -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();
diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index fad493e29d3..37ae07ee54a 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -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();