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[Colin King <1308130@xxxxxxxxxxxxxxxxxx>]

OK, I understand. My concern is that we do have a lot of processes doing
this kind of polling, so the cumulative effect of the same root issue is
causing a lot of unwanted wakeups on a "so called" idle system.

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https://bugs.launchpad.net/bugs/1308130

Title:
  indicator-messages-service is waking up every 4 seconds adding
  inotifies on paths that don't exist

Status in “indicator-messages” package in Ubuntu:
  Confirmed

Bug description:
  I've observed that an "idle" indicator-messages-services is waking up
  every 4 seconds on a poll() and doing two inotify_add_watch() calls on
  paths that don't exist, which wastes power on devices such as phones.

  strace shows:

  clock_gettime(CLOCK_MONOTONIC, {10117, 224455428}) = 0
  poll([{fd=8, events=POLLIN}, {fd=9, events=POLLIN}], 2, 3991) = 0 (Timeout)
  clock_gettime(CLOCK_MONOTONIC, {10121, 224516469}) = 0
  inotify_add_watch(9, "/usr/local/share/applications", IN_MODIFY|IN_ATTRIB|IN_CLOSE_WRITE|IN_MOVED_FROM|IN_MOVED_TO|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|IN_ONLYDIR) = -1 ENOENT (No such file or directory)
  inotify_add_watch(9, "/usr/share/ubuntu-touch/applications", IN_MODIFY|IN_ATTRIB|IN_CLOSE_WRITE|IN_MOVED_FROM|IN_MOVED_TO|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|IN_ONLYDIR) = -1 ENOENT (No such file or directory)
  clock_gettime(CLOCK_MONOTONIC, {10121, 232085521}) = 0
  poll([{fd=8, events=POLLIN}, {fd=9, events=POLLIN}], 2, 3984) = 0 (Timeout)
  clock_gettime(CLOCK_MONOTONIC, {10125, 222593684}) = 0
  inotify_add_watch(9, "/usr/local/share/applications", IN_MODIFY|IN_ATTRIB|IN_CLOSE_WRITE|IN_MOVED_FROM|IN_MOVED_TO|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|IN_ONLYDIR) = -1 ENOENT (No such file or directory)
  inotify_add_watch(9, "/usr/share/ubuntu-touch/applications", IN_MODIFY|IN_ATTRIB|IN_CLOSE_WRITE|IN_MOVED_FROM|IN_MOVED_TO|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|IN_ONLYDIR) = -1 ENOENT (No such file or directory)
  clock_gettime(CLOCK_MONOTONIC, {10125, 229094524}) = 0

  Can these redundant polling checks be reduced or removed?  Polling
  every 4 seconds is a little bit heavy handed IMHO.

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