Public bug reported:
In order to reduce system wakeups to improve laptop battery life I've
noticed that update-notifier is polling every 5 seconds, strace'ing the
process shows:
recvfrom(6, 0x8b16e4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=3, events=POLLIN}], 3,
4373) = 0 (Timeout)
recvfrom(6, 0x8b16e4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=3, events=POLLIN}], 3,
4995) = 0 (Timeout)
recvfrom(6, 0x8b16e4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=3, events=POLLIN}], 3,
4994) = 0 (Timeout)
recvfrom(6, 0x8b16e4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=3, events=POLLIN}], 3,
4999) = 0 (Timeout)
recvfrom(6, 0x8b16e4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=3, events=POLLIN}], 3,
4995) = 0 (Timeout)
recvfrom(6, 0x8b16e4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
It appears that file_monitor_periodic_check() is being called every 5
seconds and it checks to see if variables such as un->crashreport is
NULL or un->dpkg_was_run is true.
>From a casual look at the code, these are set by monitor_cb() which is
called when files are modified, so does this make the 5 second poll
unnecessary? Can we remove the 5 second polling and just do the
file_monitor_periodic_checks when monitor_cb detects something to act
upon?
As it stands, polling every 5 seconds unnecessarily keeps the CPU out of
deep sleep C states and consumes a small amount of power. This is a
low priority issue, but it would be a nice to have fix to make the code
a little more power optimal.
** Affects: update-notifier (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1227000
Title:
update-notifier is polling every 5 seconds
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