[jdk21u-dev] RFR: 8319650: Improve heap dump performance with class metadata caching [v2]

[Aleksey Shipilev]

On Wed, 10 Jan 2024 15:33:46 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Transplanted from https://github.com/openjdk/jdk21u/pull/388
>> 
>> 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)
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
> 
>  - Merge branch 'master' into JDK-8319650-heapdump-cache-class
>  - Backport 03db82818b905f21cb5ad1d56a687e238b4a6e33

Not now, bot.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/8#issuecomment-1925283569