RFR: 8357188: Remove the field MemAllocator::Allocation::_overhead_limit_exceeded and the related code

[Albert Mingkun Yang]

On Sat, 30 Aug 2025 10:49:45 GMT, Guoxiong Li <gli at openjdk.org> wrote:

> Hi all,
> 
> After JDK-8338977 [1], the field `MemAllocator::Allocation::_overhead_limit_exceeded` and the parameter `gc_overhead_limit_was_exceeded` of the method `CollectedHeap::mem_allocate` are not used by any GC. This patch removes them.
> 
> Test:
> All the tests of the command `make test TEST="hotspot:hotspot_gc"` passed locally (linux, x86_64, release build).
> 
> Best Regards,
> -- Guoxiong
> 
> [1] https://bugs.openjdk.org/browse/JDK-8338977

src/hotspot/share/gc/parallel/parallelScavengeHeap.hpp line 197:

> 195:   // an excessive amount of time is being spent doing collections
> 196:   // and caused a null to be returned.  If a null is not returned,
> 197:   // "gc_time_limit_was_exceeded" has an undefined meaning.

Outdated comments about "gc_time_limit_was_exceeded".

Looks good otherwise.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27020#discussion_r2311911209