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

[Chris Plummer]

On Mon, 25 Jan 2021 16:07:24 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.

src/hotspot/share/runtime/globals.hpp line 561:

> 559:           "level of the dump file. 0 (the default) disables gzip "          \
> 560:           "compression. Otherwise the level must be between 1 and 10.")     \
> 561:           range(0, 10)                                                      \

Isn't the range 0-9? Although `HeapDumper::dump()` imposes no upper limit (it seems it should), the `HeapDumpDCMD` sets the upper limit to 9. See `HeapDumpDCmd::execute()`.

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