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authorAndi Kleen <ak@suse.de>2006-01-11 22:44:36 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:04:55 -0800
commit95833c83f3b812c78e48db4eaa19f6c74958470b (patch)
tree8ad17da708141d66cf53c2113b4fe1710af929ec /arch/x86_64/kernel/apic.c
parent6b050f8075823b0d9ec4fad38f4f552b74e5c5af (diff)
[PATCH] x86_64: Add idle notifiers
This adds a new notifier chain that is called with IDLE_START when a CPU goes idle and IDLE_END when it goes out of idle. The context can be idle thread or interrupt context. Since we cannot rely on MONITOR/MWAIT existing the idle end check currently has to be done in all interrupt handlers. They were originally inspired by the similar s390 implementation. They have a variety of applications: - They will be needed for CONFIG_NO_IDLE_HZ - They can be used for oprofile to fix up the missing time in idle when performance counters don't tick. - They can be used for better C state management in ACPI - They could be used for microstate accounting. This is just infrastructure so far, no users. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/apic.c')
-rw-r--r--arch/x86_64/kernel/apic.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 40cbd60e2d0..628aebf9f9a 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -34,6 +34,7 @@
#include <asm/pgalloc.h>
#include <asm/mach_apic.h>
#include <asm/nmi.h>
+#include <asm/idle.h>
int apic_verbosity;
@@ -922,6 +923,7 @@ void smp_apic_timer_interrupt(struct pt_regs *regs)
* Besides, if we don't timer interrupts ignore the global
* interrupt lock, which is the WrongThing (tm) to do.
*/
+ exit_idle();
irq_enter();
smp_local_timer_interrupt(regs);
irq_exit();
@@ -981,6 +983,7 @@ __init int oem_force_hpet_timer(void)
asmlinkage void smp_spurious_interrupt(void)
{
unsigned int v;
+ exit_idle();
irq_enter();
/*
* Check if this really is a spurious interrupt and ACK it
@@ -1016,6 +1019,7 @@ asmlinkage void smp_error_interrupt(void)
{
unsigned int v, v1;
+ exit_idle();
irq_enter();
/* First tickle the hardware, only then report what went on. -- REW */
v = apic_read(APIC_ESR);