参考内核文档
Supporting multiple CPU idle levels in kernel cpuidle sysfs System global cpuidle related information and tunables are under /sys/devices/system/cpu/cpuidle The current interfaces in this directory has self-explanatory names: * current_driver * current_governor_ro With cpuidle_sysfs_switch boot option (meant for developer testing) following objects are visible instead. * current_driver * available_governors * current_governor In this case users can switch the governor at run time by writing to current_governor. Per logical CPU specific cpuidle information are under /sys/devices/system/cpu/cpuX/cpuidle for each online cpu X -------------------------------------------------------------------------------- # ls -lR /sys/devices/system/cpu/cpu0/cpuidle/ /sys/devices/system/cpu/cpu0/cpuidle/: total 0 drwxr-xr-x 2 root root 0 Feb 8 10:42 state0 drwxr-xr-x 2 root root 0 Feb 8 10:42 state1 drwxr-xr-x 2 root root 0 Feb 8 10:42 state2 drwxr-xr-x 2 root root 0 Feb 8 10:42 state3 /sys/devices/system/cpu/cpu0/cpuidle/state0: total 0 -r--r--r-- 1 root root 4096 Feb 8 10:42 desc -rw-r--r-- 1 root root 4096 Feb 8 10:42 disable -r--r--r-- 1 root root 4096 Feb 8 10:42 latency -r--r--r-- 1 root root 4096 Feb 8 10:42 name -r--r--r-- 1 root root 4096 Feb 8 10:42 power -r--r--r-- 1 root root 4096 Feb 8 10:42 residency -r--r--r-- 1 root root 4096 Feb 8 10:42 time -r--r--r-- 1 root root 4096 Feb 8 10:42 usage /sys/devices/system/cpu/cpu0/cpuidle/state1: total 0 -r--r--r-- 1 root root 4096 Feb 8 10:42 desc -rw-r--r-- 1 root root 4096 Feb 8 10:42 disable -r--r--r-- 1 root root 4096 Feb 8 10:42 latency -r--r--r-- 1 root root 4096 Feb 8 10:42 name -r--r--r-- 1 root root 4096 Feb 8 10:42 power -r--r--r-- 1 root root 4096 Feb 8 10:42 residency -r--r--r-- 1 root root 4096 Feb 8 10:42 time -r--r--r-- 1 root root 4096 Feb 8 10:42 usage /sys/devices/system/cpu/cpu0/cpuidle/state2: total 0 -r--r--r-- 1 root root 4096 Feb 8 10:42 desc -rw-r--r-- 1 root root 4096 Feb 8 10:42 disable -r--r--r-- 1 root root 4096 Feb 8 10:42 latency -r--r--r-- 1 root root 4096 Feb 8 10:42 name -r--r--r-- 1 root root 4096 Feb 8 10:42 power -r--r--r-- 1 root root 4096 Feb 8 10:42 residency -r--r--r-- 1 root root 4096 Feb 8 10:42 time -r--r--r-- 1 root root 4096 Feb 8 10:42 usage /sys/devices/system/cpu/cpu0/cpuidle/state3: total 0 -r--r--r-- 1 root root 4096 Feb 8 10:42 desc -rw-r--r-- 1 root root 4096 Feb 8 10:42 disable -r--r--r-- 1 root root 4096 Feb 8 10:42 latency -r--r--r-- 1 root root 4096 Feb 8 10:42 name -r--r--r-- 1 root root 4096 Feb 8 10:42 power -r--r--r-- 1 root root 4096 Feb 8 10:42 residency -r--r--r-- 1 root root 4096 Feb 8 10:42 time -r--r--r-- 1 root root 4096 Feb 8 10:42 usage -------------------------------------------------------------------------------- * desc : Small description about the idle state (string) * disable : Option to disable this idle state (bool) -> see note below * latency : Latency to exit out of this idle state (in microseconds) * residency : Time after which a state becomes more effecient than any shallower state (in microseconds) * name : Name of the idle state (string) * power : Power consumed while in this idle state (in milliwatts) * time : Total time spent in this idle state (in microseconds) * usage : Number of times this state was entered (count) Note: The behavior and the effect of the disable variable depends on the implementation of a particular governor. In the ladder governor, for example, it is not coherent, i.e. if one is disabling a light state, then all deeper states are disabled as well, but the disable variable does not reflect it. Likewise, if one enables a deep state but a lighter state still is disabled, then this has no effect.
其中time显示了每个idle阶段的时间长短。
前后两次idle/state*/time的时间即是进入idle的时间。
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原文链接：【cpuidle】计算每个cpu进入idle的时间，转载请注明来源！