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95833c83f3
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>
15 lines
287 B
C
15 lines
287 B
C
#ifndef _ASM_X86_64_IDLE_H
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#define _ASM_X86_64_IDLE_H 1
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#define IDLE_START 1
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#define IDLE_END 2
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struct notifier_block;
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void idle_notifier_register(struct notifier_block *n);
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void idle_notifier_unregister(struct notifier_block *n);
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void enter_idle(void);
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void exit_idle(void);
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#endif
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