[11u] RFR/A: 8231209: [REDO] JDK-8207266 ThreadMXBean::getThreadAllocatedBytes() can be quicker for self thread

[Hohensee, Paul]

This request is for a pair of backports. 8231209 is the first (and primary), 8231968 is a minor cleanup. There are CSR’s for both. The effect is to add a convenience method getCurrentThreadAllocatedBytes() to com.sun.management.ThreadMXBean that can be implemented more efficiently than the equivalent getThreadAllocatedBytes(long id), and to make the implementation of getThreadAllocatedBytes(long id) and getThreadAllocatedBytes(long[] id) more efficient. These methods are heavily used by heap profiling tools, including Amazon’s, and their efficiency is important to us. There is no effect on the TCK because com.sun.management is a platform-specific package. See the CSRs for more detail.

The patches apply cleanly (in sequence) to 11u, but I’m posting a review/approval request because the backport CSRs need approval. Once the backport CSRs are reviewed, finalized, and approved, l can tag 8231209 and 8231968.

Tested with

hotspot/jtreg/vmTestbase/nsk/monitoring
jdk/com/sun/management
jdk/jdk/jfr/event/runtime

The same tests pass/fail as with unpatched jdk11u-dev.

JDK-8231209: [REDO] JDK-8207266 ThreadMXBean::getThreadAllocatedBytes() can be quicker for self thread

Original RFE: https://bugs.openjdk.java.net/browse/JDK-8231209
Original Patch: https://hg.openjdk.java.net/jdk/jdk/rev/c29e49148be7
Original CSR: https://bugs.openjdk.java.net/browse/JDK-8231374
Original review thread: https://mail.openjdk.java.net/pipermail/serviceability-dev/2019-September/029208.html
Backport RFE: https://bugs.openjdk.java.net/browse/JDK-8247806
Backport CSR: https://bugs.openjdk.java.net/browse/JDK-8247807
JDK-8231968: getCurrentThreadAllocatedBytes default implementation s/b getThreadAllocatedBytes
Original RFE: https://bugs.openjdk.java.net/browse/JDK-8231968
Original Patch: https://hg.openjdk.java.net/jdk/jdk/rev/5bb426e9acc4
Original CSR: https://bugs.openjdk.java.net/browse/JDK-8232072
Original review thread: https://mail.openjdk.java.net/pipermail/serviceability-dev/2019-October/029659.html
Backport RFE: https://bugs.openjdk.java.net/browse/JDK-8247809
Backport CSR: https://bugs.openjdk.java.net/browse/JDK-8247810

Thanks,
Paul


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