RFR: JDK-8260282: Add option to compress heap dumps created by -XX:+HeapDumpOnOutOfMemoryError [v2]

[Chris Plummer]

On Mon, 25 Jan 2021 20:36:08 GMT, Ralf Schmelter <rschmelter at openjdk.org> wrote:

>> This change adds the optiont to created a gzipped heap dump by -XX:+HeapDumpOnOutOfMemoryError.
>> 
>> -XX:HeapDumpGzipLevel=<level> sets the compression level. 0 (the default) means no gzipping of the dump. Otherwise the level has to be between 1 and 10.
>
> Ralf Schmelter 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 six additional commits since the last revision:
> 
>  - Merge branch 'master' of https://github.com/openjdk/jdk into JDK-8260282
>  - Fixed maximum supported compression level.
>  - Fixed trailing whitespace.
>  - Merge branch 'master' of https://github.com/openjdk/jdk into JDK-8260282
>  - Change allowed levels. 0 now means disabled.#
>  - Added option to compress the heap dump created by -XX:+HeapDumpOnOutOfMemoryError

You need to run the test with a limited sized heap. Otherwise it may impact other tests, and would need to be moved into the resourcehogs directory.

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PR: https://git.openjdk.java.net/jdk/pull/2222