Ubuntu 22.04. RAPL Perf Event Interface broken

[netzdoktor]

For some reason on my Ubuntu 22.04, the RAPL perf event interface is broken. Even though I can properly read RAPL information via sysfs.

[netzdoktor]

I asked a friend to test it on his system. The issue is the same, but he has:

• OS: Arch
• Kernel: 5.15.62-1-lts

He's got the same processor as I am: i7-1165G7

[kaivogelgesang]

Friend here :D
For me, the issue seems to be that the device info directory does not exist:

pinpoint/src/data_sources/RAPL.cpp

Line 28 in ff9a769

static const std::string deviceInfoPath = "/sys/bus/event_source/devices/power/";

/sys/bus/event_source/devices is there, but the power subdirectory is not. Could this be due to a missing dependency / kernel module?

[netzdoktor]

I have also used the rapl-read.c from here: https://web.eece.maine.edu/~vweaver/projects/rapl/

It returns: "Found Unsupported model 140" but also "Trying sysfs powercap" based results in actual non-zero joules.