RFR: 8318507: G1: Improve remset clearing for humongous candidates

[Thomas Schatzl]

On Mon, 23 Oct 2023 07:20:11 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> > actually the second one is wrong, there may be code roots attached to the region.
> 
> `occupancy_less_or_equal_than` should have ensured that code-roots is empty. (The method name is not very obvious on that, IMO. Breaking it into two might be better.) I believe one can `assert(r->rem_set()->is_complete() && r->rem_set()->is_empty(), "inv");` after `clear(...)`.

👍 
This is similar to @Hamlin-Li 's question.

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PR Comment: https://git.openjdk.org/jdk/pull/16270#issuecomment-1774581765