RFR: 8312116: GenShen: make instantaneous allocation rate triggers more timely [v29]

[Kelvin Nilsen]

On Tue, 17 Feb 2026 23:37:55 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Improve comments
>
> src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp line 138:
> 
>> 136: }
>> 137: 
>> 138: void ShenandoahAdaptiveHeuristics::compute_headroom_adjustment(size_t mutator_available) {
> 
> No need for mutator_available as an argument and no need to compute byte_allocated_at_start_of_idle.
> 
> Comment: if someone changes soft_max_capacity(), this should be called to recompute.

I've simplified implementation of compute_headroom_adjustment() and removed unnecessary argument.
I've added a call to compute_headroom_adjustment() when soft_max_capacity is changed.

> src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.hpp line 123:
> 
>> 121:   void start_idle_span() override;
>> 122: 
>> 123:   // If old-generation marking finishes during an idle span and immediate old-generation garbage is identified, we will rebuild
> 
> Maybe this is redundant with start_idle_span or not even necessary (since start_idle_span doesn't need bytes_available.

I've removed resume_idle_span().

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/29039#discussion_r2824734749
PR Review Comment: https://git.openjdk.org/jdk/pull/29039#discussion_r2824735599