------- Comment From [email protected] 2015-03-23 17:37 EDT-------
Making my own comment external:

Preeti, is this fixed upstream with the default hierarchy and the
"effective_cpus" file?

be4c9dd7aee5ecf3e748da68c27b38bdca70d444

e2b9a3d7d8f4ab2f3491b8ed2ac6af692a2269b2

It seems like with the new default hierarchy upstream and the
effective_cpus file, we now will be able to distinguish between
configured cpuset and effective cpusets, which is the root cause of this
bug, afaict.

Does 15.04 ship with the legacy hierarchy on by default, I'm assuming it
does to minimize regressions? Sort of annoying to have a cgmanager flag
that only should apply if legacy is in-use?

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https://bugs.launchpad.net/bugs/1392176

Title:
  mounts cgroups unconditionally which causes undesired effects with cpu
  hotplug

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