JDK-8014478 : EnableTracing: output from multiple threads may be mixed together
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Output from multiple threads may be mixed together when using EnableTracing.
The solution adds a -XX VM flag " UseLockedTracing" to enable use of a ttyLocker during tracing. This is not enabled by default as it may not be valid to acquire, or block acquiring, a lock in all event tracing contexts. Hence this is an opt-in mechanism.
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