Comment 10 for bug 1405477

Reviewed: https://review.openstack.org/243135
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=b0aee5f006031ec0a9ac938b035615d5b8b92ddf
Submitter: Jenkins
Branch: stable/6.0

commit b0aee5f006031ec0a9ac938b035615d5b8b92ddf
Author: Denis V. Meltsaykin <email address hidden>
Date: Mon Nov 9 17:15:17 2015 +0300

    Speedup gathering pids from namespaces by OCF

    Currently, neutron OCF scripts are using `lsof` to gather pids of
    processes running in particular namespace. `lsof` is extremely slow
    due to inoptimal architecture and causes significant timeouts:
    2+ minutes on 300 pids in 300 namespaces. On the other hand,
    we cannot use `ip netns pids`, as this command is not present in
    precise. The fix changes this call to the 2-stage execution inspired
    by the original code of `ip netns pids`, which uses comparison of
    the namespace inode with the `ns/net` symlink of the running
    process that points to the required namespace. This scales about
    linear: 1.7 seconds per 300 pids in 300 namespaces.

    Closes-Bug: #1464815
    Closes-Bug: #1405477

    Change-Id: Ife3f5da3558bf4b5ddd0abbe997cd4b845a8d53c