Missing /sys/fs/cgroup/cpu/fapped/cpu.cfs_quota_us ?

[petterreinholdtsen]

Hi

I tried following the recipe in the README file, and was unable to get it to work. First, I discovered that root needed to give write access to the user (ie add "chmod u+w /sys/fs/cgroup/cpu/"). Next, I try to run "echo 10000 > /sys/fs/cgroup/cpu/fapped/cpu.cfs_quota_us" as myself, but this is rejected with "Permission denied", even though my user have write access to the fapped directory.

Did this file change name since 2013? I got these files in fapped after creation:

-rw-r--r-- 1 pere pere 0 april 14 10:53 cgroup.clone_children
-rw-r--r-- 1 pere pere 0 april 14 10:53 cgroup.procs
-r--r--r-- 1 pere pere 0 april 14 10:53 cpuacct.stat
-rw-r--r-- 1 pere pere 0 april 14 10:53 cpuacct.usage
-r--r--r-- 1 pere pere 0 april 14 10:53 cpuacct.usage_percpu
-rw-r--r-- 1 pere pere 0 april 14 10:53 cpu.shares
-rw-r--r-- 1 pere pere 0 april 14 10:53 notify_on_release
-rw-r--r-- 1 pere pere 0 april 14 10:53 tasks

I'm using kernel 3.16.0.

[petterreinholdtsen]

I investigated this a bit more and found
http://unix.stackexchange.com/questions/245139/why-cgroup-cpu-items-are-miss-in-debian-8/245344 leading to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=789019 which explain that the default kernel in Debian Stable lack CONFIG_CFS_BANDWIDTH=y.

[rugginoso]

Also you have to run the chmod as root, as you can note the # at the start of the line:

# chown youruser:yourgroup /sys/fs/cgroup/cpu/