RFR: 8258431: Provide a JFR event with live set size estimate [v6]

[Jaroslav Bachorik]

On Mon, 22 Feb 2021 17:10:28 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Jaroslav Bachorik has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Attempt to fix G1 live set size computation
>
> src/hotspot/share/gc/parallel/parallelScavengeHeap.inline.hpp line 49:
> 
>> 47:   _young_live = young_gen()->used_in_bytes();
>> 48:   _eden_live = young_gen()->eden_space()->used_in_bytes();
>> 49:   _old_live = old_gen()->used_in_bytes();
> 
> `_young_live` already seems to contain `_eden_live` looking at the implementation of `PSYoungGen::used_in_bytes()`:
> 
> I.e.
> 
> `size_t PSYoungGen::used_in_bytes() const {
>   return eden_space()->used_in_bytes()
>        + from_space()->used_in_bytes();      // to_space() is only used during scavenge
> }
> `
> 
> but maybe I'm wrong here.

This seems like a correct summary - I have updated the implementation.

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PR: https://git.openjdk.java.net/jdk/pull/2579