Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm

[sfrench/cifs-2.6.git] / Documentation / ABI / testing / sysfs-devices-system-cpu

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index a703b9e9aeb9d778b6591b066abb210811234705..84a710f87c64b17b2eab79a3a2b860c7a9c97319 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -62,6 +62,35 @@ Description: CPU topology files that describe kernel limits related to
                See Documentation/cputopology.txt for more information.
 
 
+What:          /sys/devices/system/cpu/probe
+               /sys/devices/system/cpu/release
+Date:          November 2009
+Contact:       Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description:   Dynamic addition and removal of CPU's.  This is not hotplug
+               removal, this is meant complete removal/addition of the CPU
+               from the system.
+
+               probe: writes to this file will dynamically add a CPU to the
+               system.  Information written to the file to add CPU's is
+               architecture specific.
+
+               release: writes to this file dynamically remove a CPU from
+               the system.  Information writtento the file to remove CPU's
+               is architecture specific.
+
+What:          /sys/devices/system/cpu/cpu#/node
+Date:          October 2009
+Contact:       Linux memory management mailing list <linux-mm@kvack.org>
+Description:   Discover NUMA node a CPU belongs to
+
+               When CONFIG_NUMA is enabled, a symbolic link that points
+               to the corresponding NUMA node directory.
+
+               For example, the following symlink is created for cpu42
+               in NUMA node 2:
+
+               /sys/devices/system/cpu/cpu42/node2 -> ../../node/node2
+
 
 What:          /sys/devices/system/cpu/cpu#/node
 Date:          October 2009
@@ -136,6 +165,24 @@ Description:       Discover cpuidle policy and mechanism
                See files in Documentation/cpuidle/ for more information.
 
 
+What:          /sys/devices/system/cpu/cpu#/cpufreq/*
+Date:          pre-git history
+Contact:       cpufreq@vger.kernel.org
+Description:   Discover and change clock speed of CPUs
+
+               Clock scaling allows you to change the clock speed of the
+               CPUs on the fly. This is a nice method to save battery
+               power, because the lower the clock speed, the less power
+               the CPU consumes.
+
+               There are many knobs to tweak in this directory.
+
+               See files in Documentation/cpu-freq/ for more information.
+
+               In particular, read Documentation/cpu-freq/user-guide.txt
+               to learn how to control the knobs.
+
+
 What:      /sys/devices/system/cpu/cpu*/cache/index*/cache_disable_X
 Date:      August 2008
 KernelVersion: 2.6.27