With version of 0.9.8.8-0ubuntu5 I still see one of the threads doing:
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, 3997) = 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, 3998) = 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, 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, 3996) = 0 (Timeout)
So a 0.25 Hz timeout and an inotify watch being added each time which
seems redundant on the desktop.
This is on a cleanly installed machine as of last week so I'm confident
that my laptop is relatively sane when it comes to installed packages.
To track this down I did:
sudo health-check -p NetworkManager
this showed up as:
System calls traced:
PID Process Syscall Count Rate/Sec Total
μSecs % Call Time
949 NetworkManager recvmsg 211 3.5167
2520 0.0021
949 NetworkManager sendmsg 108 1.8000
2044 0.0017
949 NetworkManager poll 97 1.6167
53977531 45.3342
949 NetworkManager write 77 1.2833
873 0.0007
949 NetworkManager read 52 0.8667
606 0.0005
949 NetworkManager restart_syscall 1 0.0167
5542655 4.6551
952 NetworkManager rt_sigtimedwait 1 0.0167
0 0.0000
959 NetworkManager inotify_add_watch 15 0.2500
301 0.0003
959 NetworkManager poll 15 0.2500
56001456 47.0340
959 NetworkManager restart_syscall 1 0.0167
3537933 2.9714
963 NetworkManager restart_syscall 1 0.0167
0 0.0000
Total 579 9.6500
119065919
and also:
Inotify watches added:
PID Process Rate/Sec File
959 NetworkManager 0.250 /var/lib/ofono
so then I just strace'd pid 959 and the rogue polling and inotify watch is
apparent. Hope that clarifies.
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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
Status in “network-manager” package in Ubuntu:
Triaged
Bug description:
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.
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