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

[Jaroslav Bachorik]

On Mon, 22 Feb 2021 16:50:48 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> src/hotspot/share/gc/g1/g1CollectedHeap.cpp line 4578:
>> 
>>> 4576: 
>>> 4577: void G1CollectedHeap::set_live(size_t bytes) {
>>> 4578:   Atomic::release_store(&_live_size, bytes);
>> 
>> I don't think this requires `release_store`, regular `store` would be enough. G1 folks can say for sure.
>
> Not required.

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>> src/hotspot/share/gc/shared/genCollectedHeap.hpp line 183:
>> 
>>> 181:     size_t live = _live_size;
>>> 182:     return live > 0 ? live : used();
>>> 183:   };
>> 
>> I think the implementation belongs to `genCollectedHeap.cpp`.
>
> +1. Does not seem to be performance sensitive.

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