camera_service eats lots of CPU even when in photo roll

[Michi Henning]

I have about a dozen photos and videos on my mako.

When I run the camera app and look at the app log, I see loads of messages like this:

libust[6087/6105]: Error: Error opening shm /lttng-ust-wait-5 (in get_wait_shm() at lttng-ust-comm.c:958)
libust[6087/6106]: Error: Error opening shm /lttng-ust-wait-5-32011 (in get_wait_shm() at lttng-ust-comm.c:958)
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0
 ext1: 1, ext2: 0

These messages are continuously being written to the log, whether I'm in the view finder or the photo roll. With the app just sitting on the photo roll page doing nothing, top reports around 40% CPU usage.

[Michi Henning (michihenning)]

BTW, that's with the latest rc-proposed image:

$ system-image-cli -i
current build number: 205
device name: mako
channel: ubuntu-touch/rc-proposed/ubuntu
last update: 2015-08-05 02:21:57
version version: 205
version ubuntu: 20150804
version device: 20150210
version custom: 20150804

[Michi Henning (michihenning)]

I'm still seeing this with the latest mako image from dc-proposed at version 226. Permanently eating half a CPU is a serious bug.

[Florian Boucault (fboucault)]

While the view finder is shown the camera is going to use CPU continuously, there is no way around that.
While in the photo roll, I do not see the camera app using much CPU however camera_service is. This needs to be investigated and fixed.

[Michi Henning (michihenning)]

Hmmm... This is not what I'm seeing on Mako. When looking at the photo roll, it is camera-app that's eating all the CPU, at 35-40%. camera-service is using about 1.6%.

[Bill Filler (bfiller)]

on latest rc-proposed on krillin I'm seeing camera-app use 20-25% and camera-service using 7-10% when on the photo roll
we should definitely fix this - when on photo roll camera-app should not be consuming any cpu

[Florian Boucault (fboucault)]

We fixed camera-app usage in photo roll, now 0% but not camera-service which is still eating the same amount as before.