Following Jean-Baptiste's notes above, I can reproduce it by taking 2
photos and then switching to the Gallery and leaving it to blank the
screen. Immediately it blanks the context switch rate jumped from ~230
cs/s to ~1200 cs/s.
Context Switches:
PID Process Voluntary Involuntary Total
Ctxt Sw/Sec Ctxt Sw/Sec Ctxt Sw/Sec
1267 unity8 326.05 71.53 397.58 (quite high)
971 unity8 315.04 0.18 315.22 (quite high)
1235 unity8 1.77 0.00 1.77 (low)
System calls traced:
PID Process Syscall Count Rate/Sec
971 unity8 futex 9006 146.4693
1267 unity8 futex 7162 116.4793
1267 unity8 ioctl 6902 112.2508
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https://bugs.launchpad.net/bugs/1219871
Title:
when idle with screen blank, unity8 generates hundreds of context
switches per second
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