Page History

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''TO DO:'' Pull in content from the following sources:

• http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2008-April/000134.html^{Image Removed}
• http://forum.java.sun.com/thread.jspa?threadID=790229^{Image Removed}
• http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6316156^{Image Removed}
• http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6565458^{Image Removed}
• http://blogs.sunoracle.com/watt/resource/jvm-options-list.html^{Image Removed}

Heuristics

• ''TO DO...
• Source code: http://hg.openjdk..''java.net/jdk7/hotspot/hotspot/file/tip/src/share/vm/opto/bytecodeInfo.cpp

Phasing

Currently, inlining decisions are performed eagerly (in both C1 and C2), as soon as the parser reaches a call site the first time.

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Hot methods are more likely to be inlined... ''(Say on...)''

Manual advice to the inliner

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• Warm up your code properly.
• Segregate fast paths from slow paths, keeping hot methods small (35 bytecodes or less) with error processing and slow paths in separate methods.
• Request inlining from the compiler oracle. ''(Need a ref.)''
• ''Future:'' Find better heuristics and code them into the JVM.
• ''Future:'' Add an @Inline annotation to the JVM. (Needs hacky POC experimentation first.)
• ''Future:'' Extend the oracle to include profiling information collected from earlier runs, or generated by an offline configuration tool.