kernel-packages team mailing list archive

[Steve Langasek <steve.langasek@xxxxxxxxxxxxx>]

After discussing this with Ted, I think the right answer architecturally
is to move these clients to talking to the session bus, where filtering
of messages will be done for us automatically, and have the session init
register on the session bus, rather than deploying an unreliable change
like having upstart only keep one message at a time in the queue for a
client.  This will require a few changes in upstart, including working
out the correct way to get the session init to register with the session
bus after dbus has been spawned (presumably we want to reuse SIGUSR1 for
this, and maybe get the session bus address out of the global
environment?)

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https://bugs.launchpad.net/bugs/1235649

Title:
  uevent spam causes libdbus client code in session upstart to consume
  massive amounts of memory on Ubuntu Touch

Status in Upstart:
  New
Status in “linux” package in Ubuntu:
  Invalid
Status in “systemd” package in Ubuntu:
  Invalid
Status in “unity” package in Ubuntu:
  New
Status in “upstart” package in Ubuntu:
  Fix Released
Status in “linux” source package in Saucy:
  Invalid
Status in “systemd” source package in Saucy:
  Invalid
Status in “unity” source package in Saucy:
  New
Status in “upstart” source package in Saucy:
  Fix Released

Bug description:
  using ubuntu touch image 82 i see the session init consume about 10MB per minute as long as the screen is on  with Mir.
  running the same session with surfaceflinger only consumes 1MB per minute.

  in both cases the system starts to swap heavily at some point, making
  the UI unresponsive.

  http://paste.ubuntu.com/6196223/ has the top output of a Mir session
  after 30min, the UI just got completely unresponsive when this
  snapshot was taken.

  http://paste.ubuntu.com/6196332/ is the top output of a surfaceflinger
  session where the screen was off for about 10min

  apparently the leak only occurs while the screen is on, it seems to be
  permanently there but in the case of surfaceflinger it hits less hard.

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