RFR: 8243315: ParallelScavengeHeap::initialize() passes GenAlignment as page size to os::trace_page_sizes instead of actual page size

[Joakim Nordström]

On Wed, 25 Nov 2020 08:48:26 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> ### Description
>> The logging for reserved heap space, printed the `GenAlignment` value instead of page size.
>> Before:
>> <pre>
>> [0.369s][info][gc      ] Using Parallel
>> [0.374s][info][pagesize] Heap:  min=2M max=2M base=0x00000000ffe00000 <b>page_size=512K</b> size=2M
>> </pre>
>> Besides changing to display page size using `os::vm_page_size()`, this fix also adds logging of `SpaceAlignment `,`GenAlignment`, and `HeapAlignment`. 
>> After:
>> <pre>
>> [0.367s][info][pagesize] <b>Alignments:  space_align=512K gen_align=512K heap_align=2M</b>
>> [0.369s][info][gc      ] Using Parallel
>> [0.374s][info][pagesize] Heap:  min=2M max=2M base=0x00000000ffe00000 <b>page_size=4K</b> size=2M
>> </pre>
>> Please advice whether the added logging of alignments is sufficient or irrelevant. There were no signs of either alignment being logged anywhere.
>> ### Testing
>> - Tested manually, and logs are showing with arguments <code>-Xlog:pagesize=info -XX:+UseParallelGC</code>
>> - Tested Tier1, Tier2, Tier3.
>
> @jaokim I've run some additional testing and haven't seen any problems so I'm ready to sponsor whenever you want to integrate.

Thank you @kstefanj and @tschatzl for reviewing and comments!

Tested tier1, tier2, tier3 without problems.

-------------

PR: https://git.openjdk.java.net/jdk/pull/1161