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Using today's phablet image on a Samsung Galaxy Nexus I observed that
one of the threads of ubuntuappmanager is polling every 500ms. I am
filing this bug in a vain attempt to try and reduce system wakeups and
hence reduce battery consumption.
Tracing this with strace, I see:
sudo strace -f -p $(pidof ubuntuappmanager)
Process 477 attached with 8 threads
[pid 1238] ioctl(13, BT819_FIFO_RESET_HIGH <unfinished ...>
[pid 602] futex(0x412b4cac, FUTEX_WAKE_PRIVATE, 2147483647 <unfinished ...>
[pid 601] epoll_wait(20, <unfinished ...>
[pid 602] <... futex resumed> ) = 0
[pid 477] ioctl(13, BT819_FIFO_RESET_HIGH <unfinished ...>
[pid 602] clock_gettime(CLOCK_MONOTONIC, <unfinished ...>
[pid 1239] ioctl(13, BT819_FIFO_RESET_HIGH <unfinished ...>
[pid 606] ioctl(13, BT819_FIFO_RESET_HIGH <unfinished ...>
[pid 604] clock_gettime(CLOCK_MONOTONIC, <unfinished ...>
[pid 603] write(6, "KeyEvents", 9 <unfinished ...>
[pid 604] <... clock_gettime resumed> {17918, 745990561}) = 0
[pid 603] <... write resumed> ) = 9
[pid 604] epoll_wait(5, <unfinished ...>
[pid 603] clock_gettime(CLOCK_MONOTONIC, <unfinished ...>
[pid 602] <... clock_gettime resumed> {17918, 745624350}) = 0
[pid 603] <... clock_gettime resumed> {17918, 746326255}) = 0
[pid 603] write(7, "KeyEvents", 9 <unfinished ...>
[pid 602] clock_gettime(CLOCK_MONOTONIC, <unfinished ...>
[pid 603] <... write resumed> ) = 9
[pid 602] <... clock_gettime resumed> {17918, 746600913}) = 0
[pid 603] epoll_wait(9, <unfinished ...>
[pid 602] epoll_wait(16, <unfinished ...>
[pid 604] <... epoll_wait resumed> {}, 16, 500) = 0
[pid 604] clock_gettime(CLOCK_MONOTONIC, {17919, 248248861}) = 0
[pid 604] epoll_wait(5, {}, 16, 500) = 0
[pid 604] clock_gettime(CLOCK_MONOTONIC, {17919, 749866293}) = 0
[pid 604] epoll_wait(5, {}, 16, 500) = 0
[pid 604] clock_gettime(CLOCK_MONOTONIC, {17920, 409625813}) = 0
[pid 604] epoll_wait(5, {}, 16, 500) = 0
[pid 604] clock_gettime(CLOCK_MONOTONIC, {17920, 911945151}) = 0
where pid 604 epoll_waits on fd 5, which is an event poll fd and is
timing out every 500ms. Perhaps this blocking epoll_wait could wait for
longer rather than continuously waking up the system every 2 seconds?
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
--
ubuntuappmanager has a thread that is polling at 2Hz
https://bugs.launchpad.net/bugs/1231585
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