JDK-6580131 : CompiledMethodLoad events don't produce the expected extra notifications to describe inlining
  • Type: Bug
  • Component: hotspot
  • Sub-Component: jvmti
  • Affected Version: 7
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: solaris_9
  • CPU: sparc
  • Submitted: 2007-07-12
  • Updated: 2017-05-16
  • Resolved: 2010-02-09
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JDK 6 JDK 7 Other
6u21Fixed 7Fixed hs17Fixed
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Description
The spec for JVMTI says or implies that CompiledMethodLoad should generate extra events to describe the inlining in a piece of compiled code.  Currently we don't do this which really limits the amount of information available for methods with heavy inlining.  We should probably be producing the extra events, assuming that existing tools don't barf when they get them.

Comments
EVALUATION ChangeSet=http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/7fbf850d87b7,ChangeRequest=6580131
2010-01-28

EVALUATION ChangeSet=http://hg.openjdk.java.net/jdk7/tl/jdk/rev/b19cd193245e,ChangeRequest=6580131
2010-01-20

EVALUATION ChangeSet=http://hg.openjdk.java.net/jdk6/jdk6/jdk/rev/6073840fbd22,ChangeRequest=6580131
2010-01-20

EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-rt/hotspot/rev/7fbf850d87b7
2010-01-20

EVALUATION http://hg.openjdk.java.net/jdk6/jdk6/hotspot/rev/7fbf850d87b7
2010-01-20

SUGGESTED FIX See the attached 6580131-webrev-cr0.tgz file for the proposed fix. This is the OpenJDK6 version of the fix.
2010-01-08

EVALUATION The folks at AMD Labs have been kind enough to provide an extension to the JVM/TI CompileMethodLoad event in order to provide additional information about in-lining. This extension uses the existing (but previously unused) compile_info paramter: http://java.sun.com/javase/6/docs/platform/jvmti/jvmti.html#CompiledMethodLoad Vasanth and company provided the HotSpot code changes and the original demo program. I'm listed as the RE for this bug, but I just did the Makefile changes to export the new jvmticmlr.h file in the HotSpot repo and the integration of the demo program into JAVA_HOME/demo/jvmti in the JDK repo. I'm also handling the CCC request for getting the jvmticmlr.h file added.
2010-01-08