RFR: 8278756: Parallel: Drop PSOldGen::_reserved

[Albert Mingkun Yang]

On Wed, 15 Dec 2021 12:56:56 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Simple change of removing `PSOldGen::_reserved` and constructing reserved mem region on the fly.
>> 
>> Test: hotspot_gc, tier1-3
>
> src/hotspot/share/gc/parallel/vmStructs_parallelgc.hpp line 60:
> 
>> 58:   nonstatic_field(PSYoungGen,                  _max_gen_size,                                 const size_t)                          \
>> 59:                                                                                                                                      \
>> 60:   nonstatic_field(PSOldGen,                    _reserved,                                     MemRegion)                             \
> 
> Can you please test tier4/5 because of the removal of this `vmStructs` field to make sure that the SA agent still runs? The tests for it are in tier4 (or 5).

Tier4-6 pass.

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PR: https://git.openjdk.java.net/jdk/pull/6829