ubuntuappmanager polls at 2Hz in one of it's threads

[Colin Ian King]

I observed that on an idle Samsung Galaxy Nexus ubuntuappmanager is producing 2 wakeups a second in one of the threads:

Wakeups:
  PID Process Wake/Sec Kernel Functions
   673 ubuntuappmanager 1.99 (hrtimer_start_range_ns, hrtimer_wakeup) (moderate)
   670 ubuntuappmanager 0.21 (hrtimer_start_range_ns, hrtimer_wakeup) (very low)
 Total 2.20

gdb shows:

#0 0x4015edf8 in epoll_wait () from /system/lib/libc.so
#1 0x4003f978 in android::Looper::pollInner(int) () from /system/lib/libutils.so
#2 0x4003fba0 in android::Looper::pollOnce(int, int*, int*, void**) () from /system/lib/libutils.so
#3 0x4003fbf4 in android::Looper::pollAll(int, int*, int*, void**) () from /system/lib/libutils.so
#4 0x40072f22 in ?? ()
#5 0x4003c416 in android::Thread::_threadLoop(void*) () from /system/lib/libutils.so
#6 0x4003bf6e in ?? () from /system/lib/libutils.so
#7 0x40155470 in __thread_entry () from /system/lib/libc.so
#8 0x40154b54 in pthread_create () from /system/lib/libc.so
#9 0x00000000 in ?? ()

strace shows:

sudo strace -p 673
Process 673 attached
clock_gettime(CLOCK_MONOTONIC, {254, 102372559}) = 0
epoll_wait(5, {}, 16, 500) = 0
clock_gettime(CLOCK_MONOTONIC, {254, 604508789}) = 0
epoll_wait(5, {}, 16, 500) = 0
clock_gettime(CLOCK_MONOTONIC, {255, 106400880}) = 0
epoll_wait(5, {}, 16, 500) = 0
clock_gettime(CLOCK_MONOTONIC, {255, 608506592}) = 0
epoll_wait(5, {}, 16, 500) = 0
clock_gettime(CLOCK_MONOTONIC, {256, 110886963}) = 0
epoll_wait(5, {}, 16, 500) = 0
clock_gettime(CLOCK_MONOTONIC, {256, 613236817}) = 0
epoll_wait(5, {}, 16, 500) = 0

so we're seeing epoll_wait() polling at 2Hz and timing out.

[Colin Ian King (colin-king)]

Any update on this bug? It seems to be gettting no attention.

[Colin Ian King (colin-king)]

I think this is an issue in libhybris doing a 2Hz epoll

[Colin Ian King (colin-king)]

This has been fixed with the latest version of libhybris