projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| fe8e288a VP |
1 | |
| 2 | ||
| 3 | Supporting multiple CPU idle levels in kernel | |
| 4 | ||
| 5 | cpuidle sysfs | |
| 6 | ||
| 7 | System global cpuidle related information and tunables are under | |
| 8 | /sys/devices/system/cpu/cpuidle | |
| 9 | ||
| 10 | The current interfaces in this directory has self-explanatory names: | |
| 11 | * current_driver | |
| 12 | * current_governor_ro | |
| 13 | ||
| 14 | With cpuidle_sysfs_switch boot option (meant for developer testing) | |
| 15 | following objects are visible instead. | |
| 16 | * current_driver | |
| 17 | * available_governors | |
| 18 | * current_governor | |
| 19 | In this case users can switch the governor at run time by writing | |
| 20 | to current_governor. | |
| 21 | ||
| 22 | ||
| 23 | Per logical CPU specific cpuidle information are under | |
| 24 | /sys/devices/system/cpu/cpuX/cpuidle | |
| 25 | for each online cpu X | |
| 26 | ||
| 27 | -------------------------------------------------------------------------------- | |
| 28 | # ls -lR /sys/devices/system/cpu/cpu0/cpuidle/ | |
| 29 | /sys/devices/system/cpu/cpu0/cpuidle/: | |
| 30 | total 0 | |
| 31 | drwxr-xr-x 2 root root 0 Feb 8 10:42 state0 | |
| 32 | drwxr-xr-x 2 root root 0 Feb 8 10:42 state1 | |
| 33 | drwxr-xr-x 2 root root 0 Feb 8 10:42 state2 | |
| 34 | drwxr-xr-x 2 root root 0 Feb 8 10:42 state3 | |
| 35 | ||
| 36 | /sys/devices/system/cpu/cpu0/cpuidle/state0: | |
| 37 | total 0 | |
| 38 | -r--r--r-- 1 root root 4096 Feb 8 10:42 desc | |
| 3a53396b | 39 | -rw-r--r-- 1 root root 4096 Feb 8 10:42 disable |
| fe8e288a VP |
40 | -r--r--r-- 1 root root 4096 Feb 8 10:42 latency |
| 41 | -r--r--r-- 1 root root 4096 Feb 8 10:42 name | |
| 42 | -r--r--r-- 1 root root 4096 Feb 8 10:42 power | |
| 43 | -r--r--r-- 1 root root 4096 Feb 8 10:42 time | |
| 44 | -r--r--r-- 1 root root 4096 Feb 8 10:42 usage | |
| 45 | ||
| 46 | /sys/devices/system/cpu/cpu0/cpuidle/state1: | |
| 47 | total 0 | |
| 48 | -r--r--r-- 1 root root 4096 Feb 8 10:42 desc | |
| 3a53396b | 49 | -rw-r--r-- 1 root root 4096 Feb 8 10:42 disable |
| fe8e288a VP |
50 | -r--r--r-- 1 root root 4096 Feb 8 10:42 latency |
| 51 | -r--r--r-- 1 root root 4096 Feb 8 10:42 name | |
| 52 | -r--r--r-- 1 root root 4096 Feb 8 10:42 power | |
| 53 | -r--r--r-- 1 root root 4096 Feb 8 10:42 time | |
| 54 | -r--r--r-- 1 root root 4096 Feb 8 10:42 usage | |
| 55 | ||
| 56 | /sys/devices/system/cpu/cpu0/cpuidle/state2: | |
| 57 | total 0 | |
| 58 | -r--r--r-- 1 root root 4096 Feb 8 10:42 desc | |
| 3a53396b | 59 | -rw-r--r-- 1 root root 4096 Feb 8 10:42 disable |
| fe8e288a VP |
60 | -r--r--r-- 1 root root 4096 Feb 8 10:42 latency |
| 61 | -r--r--r-- 1 root root 4096 Feb 8 10:42 name | |
| 62 | -r--r--r-- 1 root root 4096 Feb 8 10:42 power | |
| 63 | -r--r--r-- 1 root root 4096 Feb 8 10:42 time | |
| 64 | -r--r--r-- 1 root root 4096 Feb 8 10:42 usage | |
| 65 | ||
| 66 | /sys/devices/system/cpu/cpu0/cpuidle/state3: | |
| 67 | total 0 | |
| 68 | -r--r--r-- 1 root root 4096 Feb 8 10:42 desc | |
| 3a53396b | 69 | -rw-r--r-- 1 root root 4096 Feb 8 10:42 disable |
| fe8e288a VP |
70 | -r--r--r-- 1 root root 4096 Feb 8 10:42 latency |
| 71 | -r--r--r-- 1 root root 4096 Feb 8 10:42 name | |
| 72 | -r--r--r-- 1 root root 4096 Feb 8 10:42 power | |
| 73 | -r--r--r-- 1 root root 4096 Feb 8 10:42 time | |
| 74 | -r--r--r-- 1 root root 4096 Feb 8 10:42 usage | |
| 75 | -------------------------------------------------------------------------------- | |
| 76 | ||
| 77 | ||
| 78 | * desc : Small description about the idle state (string) | |
| 3a53396b | 79 | * disable : Option to disable this idle state (bool) |
| fe8e288a VP |
80 | * latency : Latency to exit out of this idle state (in microseconds) |
| 81 | * name : Name of the idle state (string) | |
| 82 | * power : Power consumed while in this idle state (in milliwatts) | |
| 83 | * time : Total time spent in this idle state (in microseconds) | |
| 84 | * usage : Number of times this state was entered (count) |