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authorVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>2008-02-14 00:16:13 -0500
committerLen Brown <len.brown@intel.com>2008-02-14 00:16:13 -0500
commitfe8e288a63f2f3c51c288500282d0eb5cd26a534 (patch)
treef2d0178448df4367ce3692e4b0a4ebb3f7dcbd4e /Documentation/cpuidle/core.txt
parent4fcb2fcd4d0678b8ae103d257dcb28074cbfc7fa (diff)
cpuidle: Add Documentation
Documentation for cpuidle infrastructure. (resend) Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Len Brown <len.brown@intel.com>
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+
+ 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.

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