Hi everybody, we've encountered an issue today where a phone would have at least one core pegged at ~40% usage when the phone is idle and the screen is on. If you encounter this behavior and want to help check for bug 1062119 [1].
An initial investigation shows the epoll_wait() call in the main process
event loop to be returning continuously even when nothing is happening
on the phone. I'm trying to bisect it but since it's been a long day I
might not make it so if somebody wants to pick it up he'll have my
eternal gratitude.
Cross-posting to dev-gaia because doing any performance / profiling work
on today's build is impossible.
Gabriele
[1] Continuous polling causes high CPU usage when the phone is idle
https://bugzilla.mozilla.org/show_bug.cgi?id=1062119
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