On Wed, Aug 10, 2016 at 06:09:44PM -0400, Johannes Weiner wrote:

[ That, and a disturbing number of emotional outbursts against
  systemd, which has nothing to do with any of this. ]

Oh, so I'm entirely dreaming this then:

  https://github.com/systemd/systemd/pull/3905

Completely unrelated.

Also, the argument there seems unfair at best, you don't need cpu-v2 for
buffered write control, you only need memcg and block co-mounted.