Expanding this out to systemd-devel mailing list.
On 03/14/2016 01:04 PM, Mrunal Patel wrote:
Hi, Lukas,
We are using systemd cgroups support in docker for Fedora/RHEL and
seeing some issues.
Here is the flow of the code in docker/runc/libcontainer:
1. We create a Transient Unit setting some properties based on what
the user passed or defaults.
For e.g. /system.slice/docker-abcd.scope
2. We then manually join other cgroups subsystems such as devices by
creating the directory
/sys/fs/cgroup/devices/system.slice/docker-abcd.scope. This is done so
we can support cgroups that aren't directly supported by systemd
To see the code you can refer to
https://github.com/projectatomic/docker/pull/71/files (In this PR, I
made the change to always join all the subsystems after creating the
scope to help with first issue below).
There are two classes of issues that are cropping up (especially under
load):
1. Sometimes a cgroup isn't joined even though it is passed as a
property while creating a Transient Unit. For e.g. CPUShares are
specified, however the transient unit doesn't seem to join
the cpu,cpuacct subsystem.
2. cpu.proc file itself goes missing especitally with the devices
subsystemd even thought we mkdir the directory and write to the file.
It is as if the file gets deleted by some other process.
What can we do to fix these issues?
Thanks,
Mrunal
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