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  1. 11 Oct, 2007 1 commit
  2. 12 Jan, 2006 1 commit
    • Andi Kleen's avatar
      [PATCH] x86_64: Add idle notifiers · 95833c83
      Andi Kleen authored
      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: default avatarAndi Kleen <ak@suse.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      95833c83