Use sched_yield in Monitor::MonitorEnter.
Previously we used NanoSleep(1000), but this was unreliable. It could
result in waiting for >= 40ms instead of 1us. Since this was in a loop
it was especially bad if the GC was trying to suspend all the
threads when we were sleeping. This resulted in thread suspension
occasionally taking longer than a second.
Results on the provided picasso-sample app on Nexus 5:
Longest GC pause before: ~1.5s.
Longest GC pause after: <5ms.
Also added a warning if thread suspension takes longer than a
threshold (currently 5ms).
External bug: https://code.google.com/p/android-developer-preview/issues/detail?id=367
2 files changed