** Changed in: unity-scopes-api (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1364464
Title:
unity8-dash has a thread that is polling rather rapidly on epoll wait
Status in “unity-scopes-api” package in Ubuntu:
Fix Committed
Status in “unity-scopes-shell” package in Ubuntu:
Invalid
Status in “unity8” package in Ubuntu:
Invalid
Bug description:
one of the threads to unity8-dash is creating quite a few wakeups per
second:
# eventstat 60 1
Event/s PID Task Init Function Callback
13.02 2812 scopes_ng::Scop hrtimer_start_range_ns hrtimer_wakeup
process 2812 is a thread of unity8-dash
attaching strace to the thread we see:
root@ubuntu-phablet:/proc# strace -p 2812
Process 2812 attached
clock_gettime(CLOCK_MONOTONIC, {925, 47970238}) = 0
epoll_wait(57, {}, 256, 115) = 0
clock_gettime(CLOCK_MONOTONIC, {925, 165670469}) = 0
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC, 0) = 50
fcntl64(50, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(50, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(50, {sa_family=AF_LOCAL,
sun_path="/run/user/32011/zmq/priv/clickscope"}, 110) = -1 ENOENT (No such file
or directory)
close(50) = 0
clock_gettime(CLOCK_MONOTONIC, {925, 174626930}) = 0
epoll_wait(57, {}, 256, 39) = 0
clock_gettime(CLOCK_MONOTONIC, {925, 215561930}) = 0
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC, 0) = 50
fcntl64(50, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(50, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(50, {sa_family=AF_LOCAL,
sun_path="/run/user/32011/zmq/priv/clickscope"}, 110) = -1 ENOENT (No such file
or directory)
close(50) = 0
clock_gettime(CLOCK_MONOTONIC, {925, 222932007}) = 0
epoll_wait(57, {}, 256, 65) = 0
clock_gettime(CLOCK_MONOTONIC, {925, 290266777}) = 0
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC, 0) = 50
fcntl64(50, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(50, F_SETFL, O_RDWR|O_NONBLOCK) = 0
..ad infinitum...
the epoll_wait() is sleeping a very short while before a connect to a
clickscope named socket path is attempted over and over again. Is this
rapid polling really necessary? It's contributing to 0.50%-1.00% of
the CPU load of the phone.
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