Changing real time attribs of a process not working

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1

Hello,

I’m trying to change the real time attribs of a process in Angstrom (on beaglebone) with chrt but it is not working:

chrt -p -f

returns always

chrt: failed to set pid 's policy: Operation not permitted

I’m logged in as root and set the real time limit to unlimited (ulimit -r unlimited).

Do I miss something?

Thanks

2

Yes, it's in a cpuset cgroup, change the systemd unit to allow RT access by e.g. removing it from the 'cpu' cgroup

3

Thanks for your answer Koen!

Unfortunately, I’m not able to follow your instructions, what do you mean with “removing it from the ‘cpu’ cgroup”?
Do I have to modify a file in /sys/fs/cgroup/ ?

Thanks