i can definitely make it stop consuming more ram by stopping the 
upstart-event-bridge session job.
this works on both devices. 
the ram does not get freed but the consumption does not keep rising either 
anymore then.

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  session upstart leaks massive amounts of memory on Ubuntu Touch

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

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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