RFR (M): 8014659: NPG: performance counters for compressed klass space
david.holmes at oracle.com
Thu Aug 15 10:01:44 UTC 2013
Can you add -XX:+UsePerfData to the @run for all tests that require
UsePerfData to be true (most I expect). This will let the new tests play
nicely with the Embedded builds.
On 15/08/2013 12:49 AM, Erik Helin wrote:
> Hi all,
> this change adds performance counters for compressed class space.
> Changes to hotspot:
> The main changes are in metaspaceCounters.hpp and metaspaceCounters.cpp,
> where the class MetaspaceCounters has been split up into
> MetaspaceCounters and MetaspacePerfCounters. MetaspaceCounters now owns
> an instance of MetaspacePerfCounters. The class
> CompressedClassSpaceCounters has been added which also has its own
> instance of MetaspacePerfCounters. MetaspacePerfCounters initializes and
> updates the actual performance counters.
> The changes in metaspace.hpp/cpp were needed to get some additional data
> from the metaspace data structures. The method
> free_chunks_in_total(mdtype) was made public and the method
> free_bytes(mdtype) was added. Some common functionality was extracted
> into get_space_list(mdtype) which got rid of some duplicated code.
> The changes in:
> - g1MonitorinSupport.cpp
> - parallelScavengeHeap.cpp
> - genCollectedHeap.cpp
> - universe.cpp
> are only "one-liners" that either update or initialize the new performance
> Changes to the testlibrary:
> - Added Asserts.java for writing asserts like "assertTrue",
> "assertEquals", etc.
> - Added PerfCounter.java and PerfCounters.java to make it easy to
> inspect performance counters for the currently running VM.
> - Added InputArguments.java so a test can check the arguments it got
> - Added InMemoryJavaCompiler.java for compiling a string into bytecode.
> Useful for loading classes generated at runtime without using files.
> - Added ByteCodeLoader.java for defining a new class when you already
> have the bytecode.
> - Added the new test TestMetaspacePerfCounters.java
> - JPRT
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