From fe8e288a63f2f3c51c288500282d0eb5cd26a534 Mon Sep 17 00:00:00 2001 From: Venkatesh Pallipadi Date: Thu, 14 Feb 2008 00:16:13 -0500 Subject: cpuidle: Add Documentation Documentation for cpuidle infrastructure. (resend) Signed-off-by: Venkatesh Pallipadi Reviewed-by: Randy Dunlap Signed-off-by: Len Brown --- Documentation/cpuidle/governor.txt | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/cpuidle/governor.txt (limited to 'Documentation/cpuidle/governor.txt') diff --git a/Documentation/cpuidle/governor.txt b/Documentation/cpuidle/governor.txt new file mode 100644 index 000000000000..12c6bd50c9f6 --- /dev/null +++ b/Documentation/cpuidle/governor.txt @@ -0,0 +1,29 @@ + + + + Supporting multiple CPU idle levels in kernel + + cpuidle governors + + + + +cpuidle governor is policy routine that decides what idle state to enter at +any given time. cpuidle core uses different callbacks to the governor. + +* enable() to enable governor for a particular device +* disable() to disable governor for a particular device +* select() to select an idle state to enter +* reflect() called after returning from the idle state, which can be used + by the governor for some record keeping. + +More than one governor can be registered at the same time and +users can switch between drivers using /sysfs interface (when enabled). +More than one governor part is supported for developers to easily experiment +with different governors. By default, most optimal governor based on your +kernel configuration and platform will be selected by cpuidle. + +Interfaces: +extern int cpuidle_register_governor(struct cpuidle_governor *gov); +extern void cpuidle_unregister_governor(struct cpuidle_governor *gov); +struct cpuidle_governor -- cgit v1.2.3