42ac777ed3
cpu.rt_runtime PR https://github.com/docker/docker/pull/23430 introduced a couple more flags including `--cpu-rt-runtime` to the docker daemon. It appears recent changes or merge issues may have broken this. It currently does not take the cgroup mount point into account when determining the cgroup files to write values to. This breaks docker setting its own `cpu.rt_runtime` for the daemon. This also means containers aren't able to set theirs. Also, the cgroups.FindCgroupMountpointAndRoot returns back a mount point that includes the cgroup of the currently running container when docker is run inside a docker container. this breaks the `--cpu-rt-runtime` flag when running docker in docker. A fix has been placed here, but potentially could be pulled up into libcontainer if this is a better place for it. Signed-off-by: Erik St. Martin <alakriti@gmail.com> Upstream-commit: 40e075532ab4d01b4ceb36f145b95e2d3a5d951f Component: engine