[10] RFR: 8179040: Avoid Ticks::now calls when EventClassLoad is not enabled
Claes Redestad
claes.redestad at oracle.com
Tue Apr 25 13:21:11 UTC 2017
Hi,
this patch removes calling Ticks::now when EventClassLoad isn't enabled,
which
has an effect on class loading performance:
http://cr.openjdk.java.net/~redestad/8179040/hotspot.01/
When tracing isn't enabled trace/tracing.hpp has dummy implementations
which
are easily optimized away by a compiler, which I've verified happens on
linux
OpenJDK builds with tracing disabled.
On builds with tracing enabled then the changes means the call to get
the time
only happen if the event is enabled, which achieves the sought after startup
optimization.
Thanks!
/Claes
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