[Bug 1303649] Re: systemd-logind spins in cgmanager_ping_sync()

[Serge Hallyn]

Actually the source of the problem is that I was calling
nih_dbus_setup(), which actually sets up the mainloop.  It is not needed
- as I thought it was - for making *_sync calls from cgmanager-
client.so.  So the right fix is to not call that.

Two comments on this.  First, nih_dbus_setup() seems misleadingly named,
though that may just be how I read it.  The comments above that function
are plenty clear and I should have seen those.

Second, the default nih dbus connection is a shared one, which always
does nih_dbus_setup().  So for anyone to use libcgmanager without a nih
mainloop, they  *must* use the dbus_connection_open_private().  We
should probably mention that somewhere  in the libcgmanager
documentation.

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https://bugs.launchpad.net/bugs/1303649

Title:
  systemd-logind spins in cgmanager_ping_sync()

Status in “cgmanager” package in Ubuntu:
  Confirmed
Status in “libnih” package in Ubuntu:
  Confirmed
Status in “lxc” package in Ubuntu:
  Confirmed
Status in “systemd” package in Ubuntu:
  Confirmed

Bug description:
  systemd-logind is consuming a high level of cpu on a continual basis:

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                
    676 root      20   0   43644   2144   1568 R 100.0  0.0  74:43.77 systemd-logind

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: systemd-services 204-5ubuntu17
  ProcVersionSignature: Ubuntu 3.13.0-22.44-generic 3.13.8
  Uname: Linux 3.13.0-22-generic x86_64
  ApportVersion: 2.14.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Apr  7 09:09:37 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-04-23 (348 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130423)
  SourcePackage: systemd
  UpgradeStatus: Upgraded to trusty on 2013-11-11 (146 days ago)

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