[Linux] offline cpus raise NotImplementedError in cpu_freq

[ohsix]

python3-psutil (5.9.2) on fedora 38

turn cpu1 off:
echo 0 > /sys/devices/system/cpu/cpu1/online

or every cpu but cpu0:
for i in $(seq 1 $(nproc --ignore=1)); do echo 0 > /sys/devices/system/cpu/cpu$i/online; done
cpu_freq needs one more case to skip offline cpus (or ones without the sysfs files for frequency, which means the same thing)

psutil/psutil/_pslinux.py

Line 749 in 7eadee3

raise NotImplementedError(

[singingtelegram]

Experienced the same issue after turning some cores off.

  File "/usr/lib/python3/dist-packages/psutil/__init__.py", line 1864, in cpu_freq
    ret = _psplatform.cpu_freq()
          ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/psutil/_pslinux.py", line 742, in cpu_freq
    raise NotImplementedError(
NotImplementedError: can't find current frequency file