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README.md

Power monitoring permissions

In recent kernel versions, precise power monitoring is only accessible to root users to prevent using it as a side-channel attack. In order to get the power monitoring output you'll need to give the palantir user access to this data using the following steps.

  • Create a group using

    sudo groupadd powermonitoring

  • Create /etc/udev/rules.d/99-powermonitoring.rules with

    SUBSYSTEM=="powercap", ACTION=="add", RUN+="/bin/chgrp -R powermonitoring /sys%p", RUN+="/bin/chmod -R g=u /sys%p"
SUBSYSTEM=="powercap", ACTION=="change", ENV{TRIGGER}!="none", RUN+="/bin/chgrp -R powermonitoring /sys%p", RUN+="/bin/chmod -R g=u /sys%p"

  • Apply the udev rules

    sudo udevadm control --reload-rules && sudo udevadm trigger

  • Add your user to the group

    sudo usermod -a -G powermonitoring palantir

  • Verify that you can read energy usage

    sudo su - palantir -c 'cat /sys/class/powercap/intel-rapl:0:0/energy_uj'