[Bug 1235649] Re: session upstart leaks massive amounts of memory on Ubuntu Touch

[James Hunt]

I don't have a maguro device so debugging is going to have to be by
proxy :)

A few questions:

1) Does this only occur when the system is read-only?
2) Are logs growning fast in ~/.cache/upstart/ ?
3) What is the screen doing when it is on? Is it enough to run "powerd-cli display on" to see the issue?
4) Is the issue seen on any other hardware?
5) How do you toggle between Mir and SF?

Please could you:

a) Run the Session Init in debug mode by adding '--debug' to 'init --user' in /usr/bin/ubuntu-touch-session.
b) attach ~/.xsession-errors
c) Get an strace of the Session Init.

Sounds like this issue may be related to kernel bug 1234743.

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

Title:
  session upstart leaks massive amounts of memory on Ubuntu Touch

Status in “upstart” package in Ubuntu:
  Confirmed
Status in “upstart” source package in Saucy:
  Confirmed

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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