RFR: 8255234: ZGC: Bulk allocate forwarding data structures [v2]

[Albert Mingkun Yang]

On Fri, 23 Oct 2020 07:48:22 GMT, Per Liden <pliden at openjdk.org> wrote:

>> src/hotspot/share/gc/z/zRelocationSet.cpp line 70:
>> 
>>> 68: 
>>> 69: void ZRelocationSet::reset() {
>>> 70:   _nforwardings = 0;
>> 
>> This is not needed, right? `_nforwardings` will be properly reset in `populate`.
>
> Yes, this is strictly not needed. But even if the backing memory is still there, the relocation set is conceptually reset here. For example, RelocationSetIterator should not return any forwardings after this point.

True; the set is conceptually empty after this.

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PR: https://git.openjdk.java.net/jdk/pull/804