include/asm-x86/idle.h

#ifndef _ASM_X86_64_IDLE_H
#define _ASM_X86_64_IDLE_H 1

#define IDLE_START 1
#define IDLE_END 2

struct notifier_block;
void idle_notifier_register(struct notifier_block *n);

void enter_idle(void);
void exit_idle(void);

#endif
[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> 2006-01-11 22:44:36 +01:00			`#ifndef _ASM_X86_64_IDLE_H`
			`#define _ASM_X86_64_IDLE_H 1`

			`#define IDLE_START 1`
			`#define IDLE_END 2`

			`struct notifier_block;`
			`void idle_notifier_register(struct notifier_block *n);`

			`void enter_idle(void);`
			`void exit_idle(void);`

			`#endif`