Pcm displays abnormal data, when used in combination with memguard.

[K1ngRay]

Memgurad : https://github.com/heechul/memguard.git

When I insmod memguard, the IPC becomes -1, and all other indicators are abnormal. As long as I rmmod memguard, the PCM is normal again.

Where may this be the problem? How should I correct it?

[rdementi]

could you try to run PCM without RDT (https://github.com/intel/pcm/blob/master/doc/ENVVAR_README.md):

export PCM_NO_RDT=1
pcm

does it help or you still see the contention issue?

[K1ngRay]

could you try to run PCM without RDT (https://github.com/intel/pcm/blob/master/doc/ENVVAR_README.md):

export PCM_NO_RDT=1
pcm

does it help or you still see the contention issue?

don't work! IPC still is -1.00.

[rdementi]

I had a look at the source code of memguard. Same as PCM, memguard relies on exclusive access to the performance monitoring unit (CPU performance counters):
https://github.com/heechul/memguard/blob/bcb08a4ad64316e193d635b535984795a9e9cc50/memguard.c#L755

ALso memguard seems to have a higher priority such that it revoked access to CPU performance counters from pcm.

[K1ngRay]

I had a look at the source code of memguard. Same as PCM, memguard relies on exclusive access to the performance monitoring unit (CPU performance counters): https://github.com/heechul/memguard/blob/bcb08a4ad64316e193d635b535984795a9e9cc50/memguard.c#L755

ALso memguard seems to have a higher priority such that it revoked access to CPU performance counters from pcm.

Oh, I see. Thank you very much!