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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 | |
39 | -r--r--r-- 1 root root 4096 Feb 8 10:42 latency | |
40 | -r--r--r-- 1 root root 4096 Feb 8 10:42 name | |
41 | -r--r--r-- 1 root root 4096 Feb 8 10:42 power | |
42 | -r--r--r-- 1 root root 4096 Feb 8 10:42 time | |
43 | -r--r--r-- 1 root root 4096 Feb 8 10:42 usage | |
44 | ||
45 | /sys/devices/system/cpu/cpu0/cpuidle/state1: | |
46 | total 0 | |
47 | -r--r--r-- 1 root root 4096 Feb 8 10:42 desc | |
48 | -r--r--r-- 1 root root 4096 Feb 8 10:42 latency | |
49 | -r--r--r-- 1 root root 4096 Feb 8 10:42 name | |
50 | -r--r--r-- 1 root root 4096 Feb 8 10:42 power | |
51 | -r--r--r-- 1 root root 4096 Feb 8 10:42 time | |
52 | -r--r--r-- 1 root root 4096 Feb 8 10:42 usage | |
53 | ||
54 | /sys/devices/system/cpu/cpu0/cpuidle/state2: | |
55 | total 0 | |
56 | -r--r--r-- 1 root root 4096 Feb 8 10:42 desc | |
57 | -r--r--r-- 1 root root 4096 Feb 8 10:42 latency | |
58 | -r--r--r-- 1 root root 4096 Feb 8 10:42 name | |
59 | -r--r--r-- 1 root root 4096 Feb 8 10:42 power | |
60 | -r--r--r-- 1 root root 4096 Feb 8 10:42 time | |
61 | -r--r--r-- 1 root root 4096 Feb 8 10:42 usage | |
62 | ||
63 | /sys/devices/system/cpu/cpu0/cpuidle/state3: | |
64 | total 0 | |
65 | -r--r--r-- 1 root root 4096 Feb 8 10:42 desc | |
66 | -r--r--r-- 1 root root 4096 Feb 8 10:42 latency | |
67 | -r--r--r-- 1 root root 4096 Feb 8 10:42 name | |
68 | -r--r--r-- 1 root root 4096 Feb 8 10:42 power | |
69 | -r--r--r-- 1 root root 4096 Feb 8 10:42 time | |
70 | -r--r--r-- 1 root root 4096 Feb 8 10:42 usage | |
71 | -------------------------------------------------------------------------------- | |
72 | ||
73 | ||
74 | * desc : Small description about the idle state (string) | |
75 | * latency : Latency to exit out of this idle state (in microseconds) | |
76 | * name : Name of the idle state (string) | |
77 | * power : Power consumed while in this idle state (in milliwatts) | |
78 | * time : Total time spent in this idle state (in microseconds) | |
79 | * usage : Number of times this state was entered (count) |