Eric Lee / smarc-fsl-linux-kernel

12 Jan, 2006

1 commit

  • 95833c83f   [PATCH] x86_64: Add idle notifiers ... Browse Code ยป

    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
    Signed-off-by: Linus Torvalds

    Andi Kleen