RFR: Refactor budgeting to make the logic cleaner

[Roman Kennke]

On Tue, 28 Jun 2022 03:20:44 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> This commit consolidates computations related to budgeting of reserves for old-gen evacuation and old-gen promotion within shenandoahGeneration::prepare_regions_and_collection_set().  Previously, these computations had been scattered between several functional units, including shenandoahHeuristics::choose_collection_set() and shenandoahOldHeuristics::prime_collection_set().  A previous pull request brought some of the redundant functionality into prepare_regions_and_collection_set().  This pull request removes the redundant computations from the other locations.

src/hotspot/share/gc/shenandoah/shenandoahHeap.inline.hpp line 689:

> 687: 
> 688: void ShenandoahHeap::set_previous_promotion(size_t promoted_bytes) {
> 689:   shenandoah_assert_heaplocked();

Is this related and/or relevant?

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PR: https://git.openjdk.org/shenandoah/pull/148