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Re: [mat-dev] processing of HPROF_GC_CLASS_DUMP
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> From: Dacong Yan <tonywinslow1986@xxxxxxxxx>
>
> Hi,
>
> Where can I find the source code in MAT that processes
> HPROF_GC_CLASS_DUMP? I am trying to modify openjdk and dump additional
> info from perm gen, so I want to make sure MAT can read the extra
> info.
>
> Looking at the vm source code
> (http://hg.openjdk.java.net/jdk7/jdk7/hotspot/file/57552dca1708/src/
> share/vm/services/heapDumper.cpp#l215),
> I can see two reserved fields in HPROF_GC_CLASS_DUMP and the plan is
> to make use of them for extra info.
>
> Thanks,
> Tony
The source code is at
http://dev.eclipse.org/viewsvn/viewvc.cgi/trunk/plugins/org.eclipse.mat.hprof/src/org/eclipse/mat/hprof/?root=TOOLS_MAT
See also here for Javadoc:
http://help.eclipse.org/luna/topic/org.eclipse.mat.ui.help/doc/org/eclipse/mat/hprof/package-summary.html
The general way that heap dump parsers work is explained here:
http://wiki.eclipse.org/MemoryAnalyzer/Adding_a_new_heap_dump_format_to_the_Memory_Analyzer
OpenJDK is GPL, which isn't compatible with the Eclipse Public License, so
we aren't able to include any OpenJDK source code into the MAT codebase,
but we can and do inter-operate with the HPROF dump format.
Andrew Johnson
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