Making PrintEscapeAnalysis a diagnostic option on product VM? (original) (raw)

Chris Newland cnewland at chrisnewland.com
Fri Jun 19 10:16:24 UTC 2015

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Hi, hope this is the correct list (perhaps serviceability?)

I'm experimenting with some HotSpot changes that log escape analysis decisions so that I can visualise eliminated allocations at the source and bytecode levels in JITWatch[1].

My plan was to build a companion VM for JITWatch based on the product VM that would allow users to inspect some of the deeper workings such as EA and DCE that are not present in the LogCompilation output.

I mentioned this to some performance guys at Devoxx and they didn't like the custom VM idea and suggested I put in a request to consider making -XX:+PrintEscapeAnalysis available under -XX:+UnlockDiagnosticVMOptions on the product VM (it's currently a notproduct option).

If this is something you would consider than could I also request consideration of -XX:+PrintEliminateAllocations.

All I would need is the class, method, and bci of each NoEscape detected.

Kind regards,

Chris

[1] https://github.com/AdoptOpenJDK/jitwatch

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