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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 /include
parent6b050f8075823b0d9ec4fad38f4f552b74e5c5af (diff)
downloadop-kernel-dev-95833c83f3b812c78e48db4eaa19f6c74958470b.zip
op-kernel-dev-95833c83f3b812c78e48db4eaa19f6c74958470b.tar.gz
[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 'include')
-rw-r--r--include/asm-x86_64/idle.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/asm-x86_64/idle.h b/include/asm-x86_64/idle.h
new file mode 100644
index 0000000..6bd47dc
--- /dev/null
+++ b/include/asm-x86_64/idle.h
@@ -0,0 +1,14 @@
+#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 idle_notifier_unregister(struct notifier_block *n);
+
+void enter_idle(void);
+void exit_idle(void);
+
+#endif
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