diff options
Diffstat (limited to 'Documentation/cpuidle')
-rw-r--r-- | Documentation/cpuidle/core.txt | 23 | ||||
-rw-r--r-- | Documentation/cpuidle/driver.txt | 31 | ||||
-rw-r--r-- | Documentation/cpuidle/governor.txt | 29 | ||||
-rw-r--r-- | Documentation/cpuidle/sysfs.txt | 84 |
4 files changed, 0 insertions, 167 deletions
diff --git a/Documentation/cpuidle/core.txt b/Documentation/cpuidle/core.txt deleted file mode 100644 index 63ecc5dc9d8..00000000000 --- a/Documentation/cpuidle/core.txt +++ /dev/null @@ -1,23 +0,0 @@ - - Supporting multiple CPU idle levels in kernel - - cpuidle - -General Information: - -Various CPUs today support multiple idle levels that are differentiated -by varying exit latencies and power consumption during idle. -cpuidle is a generic in-kernel infrastructure that separates -idle policy (governor) from idle mechanism (driver) and provides a -standardized infrastructure to support independent development of -governors and drivers. - -cpuidle resides under drivers/cpuidle. - -Boot options: -"cpuidle_sysfs_switch" -enables current_governor interface in /sys/devices/system/cpu/cpuidle/, -which can be used to switch governors at run time. This boot option -is meant for developer testing only. In normal usage, kernel picks the -best governor based on governor ratings. -SEE ALSO: sysfs.txt in this directory. diff --git a/Documentation/cpuidle/driver.txt b/Documentation/cpuidle/driver.txt deleted file mode 100644 index 7a9e09ece93..00000000000 --- a/Documentation/cpuidle/driver.txt +++ /dev/null @@ -1,31 +0,0 @@ - - - Supporting multiple CPU idle levels in kernel - - cpuidle drivers - - - - -cpuidle driver hooks into the cpuidle infrastructure and handles the -architecture/platform dependent part of CPU idle states. Driver -provides the platform idle state detection capability and also -has mechanisms in place to support actual entry-exit into CPU idle states. - -cpuidle driver initializes the cpuidle_device structure for each CPU device -and registers with cpuidle using cpuidle_register_device. - -It can also support the dynamic changes (like battery <-> AC), by using -cpuidle_pause_and_lock, cpuidle_disable_device and cpuidle_enable_device, -cpuidle_resume_and_unlock. - -Interfaces: -extern int cpuidle_register_driver(struct cpuidle_driver *drv); -extern void cpuidle_unregister_driver(struct cpuidle_driver *drv); -extern int cpuidle_register_device(struct cpuidle_device *dev); -extern void cpuidle_unregister_device(struct cpuidle_device *dev); - -extern void cpuidle_pause_and_lock(void); -extern void cpuidle_resume_and_unlock(void); -extern int cpuidle_enable_device(struct cpuidle_device *dev); -extern void cpuidle_disable_device(struct cpuidle_device *dev); diff --git a/Documentation/cpuidle/governor.txt b/Documentation/cpuidle/governor.txt deleted file mode 100644 index 12c6bd50c9f..00000000000 --- a/Documentation/cpuidle/governor.txt +++ /dev/null @@ -1,29 +0,0 @@ - - - - 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 diff --git a/Documentation/cpuidle/sysfs.txt b/Documentation/cpuidle/sysfs.txt deleted file mode 100644 index 9d28a3406e7..00000000000 --- a/Documentation/cpuidle/sysfs.txt +++ /dev/null @@ -1,84 +0,0 @@ - - - Supporting multiple CPU idle levels in kernel - - cpuidle sysfs - -System global cpuidle related information and tunables are under -/sys/devices/system/cpu/cpuidle - -The current interfaces in this directory has self-explanatory names: -* current_driver -* current_governor_ro - -With cpuidle_sysfs_switch boot option (meant for developer testing) -following objects are visible instead. -* current_driver -* available_governors -* current_governor -In this case users can switch the governor at run time by writing -to current_governor. - - -Per logical CPU specific cpuidle information are under -/sys/devices/system/cpu/cpuX/cpuidle -for each online cpu X - --------------------------------------------------------------------------------- -# ls -lR /sys/devices/system/cpu/cpu0/cpuidle/ -/sys/devices/system/cpu/cpu0/cpuidle/: -total 0 -drwxr-xr-x 2 root root 0 Feb 8 10:42 state0 -drwxr-xr-x 2 root root 0 Feb 8 10:42 state1 -drwxr-xr-x 2 root root 0 Feb 8 10:42 state2 -drwxr-xr-x 2 root root 0 Feb 8 10:42 state3 - -/sys/devices/system/cpu/cpu0/cpuidle/state0: -total 0 --r--r--r-- 1 root root 4096 Feb 8 10:42 desc --rw-r--r-- 1 root root 4096 Feb 8 10:42 disable --r--r--r-- 1 root root 4096 Feb 8 10:42 latency --r--r--r-- 1 root root 4096 Feb 8 10:42 name --r--r--r-- 1 root root 4096 Feb 8 10:42 power --r--r--r-- 1 root root 4096 Feb 8 10:42 time --r--r--r-- 1 root root 4096 Feb 8 10:42 usage - -/sys/devices/system/cpu/cpu0/cpuidle/state1: -total 0 --r--r--r-- 1 root root 4096 Feb 8 10:42 desc --rw-r--r-- 1 root root 4096 Feb 8 10:42 disable --r--r--r-- 1 root root 4096 Feb 8 10:42 latency --r--r--r-- 1 root root 4096 Feb 8 10:42 name --r--r--r-- 1 root root 4096 Feb 8 10:42 power --r--r--r-- 1 root root 4096 Feb 8 10:42 time --r--r--r-- 1 root root 4096 Feb 8 10:42 usage - -/sys/devices/system/cpu/cpu0/cpuidle/state2: -total 0 --r--r--r-- 1 root root 4096 Feb 8 10:42 desc --rw-r--r-- 1 root root 4096 Feb 8 10:42 disable --r--r--r-- 1 root root 4096 Feb 8 10:42 latency --r--r--r-- 1 root root 4096 Feb 8 10:42 name --r--r--r-- 1 root root 4096 Feb 8 10:42 power --r--r--r-- 1 root root 4096 Feb 8 10:42 time --r--r--r-- 1 root root 4096 Feb 8 10:42 usage - -/sys/devices/system/cpu/cpu0/cpuidle/state3: -total 0 --r--r--r-- 1 root root 4096 Feb 8 10:42 desc --rw-r--r-- 1 root root 4096 Feb 8 10:42 disable --r--r--r-- 1 root root 4096 Feb 8 10:42 latency --r--r--r-- 1 root root 4096 Feb 8 10:42 name --r--r--r-- 1 root root 4096 Feb 8 10:42 power --r--r--r-- 1 root root 4096 Feb 8 10:42 time --r--r--r-- 1 root root 4096 Feb 8 10:42 usage --------------------------------------------------------------------------------- - - -* desc : Small description about the idle state (string) -* disable : Option to disable this idle state (bool) -* latency : Latency to exit out of this idle state (in microseconds) -* name : Name of the idle state (string) -* power : Power consumed while in this idle state (in milliwatts) -* time : Total time spent in this idle state (in microseconds) -* usage : Number of times this state was entered (count) |