Hi Michael,
I've tried hard to reproduce this on today's image with the latest
updates and can no longer reproduce this. I guess something must have
got fixed between 2nd September and now. With lots of apps open and
various attempts to make this fail, I get a very low CPU load and just a
few context switches a second, and no crazy high futex() system call
counts per second.
CPU usage:
PID Process USR% SYS% TOTAL% Duration
911 unity8 0.01 0.00 0.01 73.50 (very light load)
Wakeups:
PID Process Wake/Sec Kernel Functions
911 unity8 0.01 (hrtimer_start_range_ns, hrtimer_wakeup)
(very low)
Context Switches:
PID Process Voluntary Involuntary Total
Ctxt Sw/Sec Ctxt Sw/Sec Ctxt Sw/Sec
911 unity8 0.34 0.00 0.34 (very low)
1224 unity8 0.16 0.03 0.19 (very low)
1220 unity8 0.18 0.00 0.18 (very low)
2113 unity8 0.16 0.00 0.16 (very low)
1520 unity8 0.16 0.00 0.16 (very low)
1466 unity8 0.16 0.00 0.16 (very low)
1465 unity8 0.16 0.00 0.16 (very low)
1226 unity8 0.16 0.00 0.16 (very low)
1219 unity8 0.16 0.00 0.16 (very low)
1218 unity8 0.16 0.00 0.16 (very low)
1198 unity8 0.16 0.00 0.16 (very low)
1197 unity8 0.16 0.00 0.16 (very low)
1192 unity8 0.16 0.00 0.16 (very low)
1169 unity8 0.16 0.00 0.16 (very low)
1168 unity8 0.16 0.00 0.16 (very low)
1156 unity8 0.16 0.00 0.16 (very low)
Total 2.80 0.03 2.83
I guess this is now fixed.
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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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