Public bug reported:
I was looking at what's sucking power on the Trusty desktop and found
that NetworkManager is polling every 4 seconds adding an inotify watch
on /var/lib/ofono (which does not exist on the desktop - isn't that a
phone related component?).
Anyhow, strace on one of the threads of NetworkManager shows:
sudo strace -p 710
Process 710 attached
restart_syscall(<... resuming interrupted call ...>) = 0
inotify_add_watch(8, "/var/lib/ofono",
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)
poll([{fd=9, events=POLLIN}, {fd=8, events=POLLIN}], 2, 3996) = 0 (Timeout)
inotify_add_watch(8, "/var/lib/ofono",
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)
poll([{fd=9, events=POLLIN}, {fd=8, events=POLLIN}], 2, 3995) = 0 (Timeout)
inotify_add_watch(8, "/var/lib/ofono",
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)
poll([{fd=9, events=POLLIN}, {fd=8, events=POLLIN}], 2, 3995) = 0 (Timeout)
inotify_add_watch(8, "/var/lib/ofono",
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)
So:
1. The polling is rather heavy - every 4 seconds? Is that really necessary?
2. Surely we can avoid repeatedly adding a watch on a directory that does not
exist. Are there better ways than doing this so frequently, especially because
it does not seem relevant on my desktop install.
Anyhow, can this be investigated, it's one of the final big causes of
wakeups on an idle desktop image.
** Affects: network-manager-applet (Ubuntu)
Importance: High
Status: New
** Changed in: network-manager-applet (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1289532
Title:
NetworkManager is polling every 4 seconds on the Desktop looking for
/var/lib/ofono
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