docker/libcontainer — pull request #189 by vmarmol (2014-09-11 00:45:28+00:00)
Title: Cache cgroup root mount location.

We calculate this on every cgroup call. It comprised of 30%+ of the CPU
usage in cAdvisor.

Docker-DCO-1.1-Signed-off-by: Victor Marmol (github: vmarmol)