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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/smp.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/smp.c')
-rw-r--r--arch/x86_64/kernel/smp.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/smp.c b/arch/x86_64/kernel/smp.c
index cfc3d9dccbd9..6a666d248c12 100644
--- a/arch/x86_64/kernel/smp.c
+++ b/arch/x86_64/kernel/smp.c
@@ -27,6 +27,7 @@
#include <asm/mmu_context.h>
#include <asm/proto.h>
#include <asm/apicdef.h>
+#include <asm/idle.h>
/*
* Smarter SMP flushing macros.
@@ -512,6 +513,7 @@ asmlinkage void smp_call_function_interrupt(void)
/*
* At this point the info structure may be out of scope unless wait==1
*/
+ exit_idle();
irq_enter();
(*func)(info);
irq_exit();