| Venkatesh Pallipadi | fe8e288 | 2008-02-14 00:16:13 -0500 | [diff] [blame] | 1 | |
| 2 | Supporting multiple CPU idle levels in kernel |
| 3 | |
| 4 | cpuidle |
| 5 | |
| 6 | General Information: |
| 7 | |
| 8 | Various CPUs today support multiple idle levels that are differentiated |
| 9 | by varying exit latencies and power consumption during idle. |
| 10 | cpuidle is a generic in-kernel infrastructure that separates |
| 11 | idle policy (governor) from idle mechanism (driver) and provides a |
| 12 | standardized infrastructure to support independent development of |
| 13 | governors and drivers. |
| 14 | |
| 15 | cpuidle resides under drivers/cpuidle. |
| 16 | |
| 17 | Boot options: |
| 18 | "cpuidle_sysfs_switch" |
| 19 | enables current_governor interface in /sys/devices/system/cpu/cpuidle/, |
| 20 | which can be used to switch governors at run time. This boot option |
| 21 | is meant for developer testing only. In normal usage, kernel picks the |
| 22 | best governor based on governor ratings. |
| 23 | SEE ALSO: sysfs.txt in this directory. |