[jdk21u] RFR: 8319650: Improve heap dump performance with class metadata caching
Aleksey Shipilev
shade at openjdk.org
Wed Nov 22 18:20:15 UTC 2023
Unclean backport to improve heap dump performance. The uncleanliness comes from [JDK-8306441](https://bugs.openjdk.org/browse/JDK-8306441) that does not exist in JDK 21, and which I don't think we want to backport at the moment. I had to add a few more `ResourceMark`-s near `HeapDumpWriter` to manage the cache allocations.
Additional testing:
- [x] MacOS AArch64 server release, heap dump performance improved
- [x] Linux x86_64 server fastdebug, serviceability/ (contains heap dump tests)
- [x] Linux x86_64 server fastdebug, runtime/ErrorHandling (contains heap dump on failure tests)
- [x] Linux x86_64 server fastdebug, gc/epsilon (contains heap dump on failure tests)
- [x] Linux x86_64 server fastdebug, sun/tools/jhsdb (contains heap dump tests)
-------------
Commit messages:
- Backport 03db82818b905f21cb5ad1d56a687e238b4a6e33
Changes: https://git.openjdk.org/jdk21u/pull/388/files
Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=388&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8319650
Stats: 138 lines in 1 file changed: 114 ins; 5 del; 19 mod
Patch: https://git.openjdk.org/jdk21u/pull/388.diff
Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/388/head:pull/388
PR: https://git.openjdk.org/jdk21u/pull/388
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