RFR: 8375981: G1: Convert G1RemSet helper classes to use Atomic<T>

[Aleksey Shipilev]

On Wed, 21 Jan 2026 12:31:34 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this conversion of `G1RemSet` helper classes to use `Atomic<>`.
> 
> There has been one additional non-volatile member that has been converted to use `Atomic<T>`.
> 
> Testing: gha, tier1
> 
> Thanks,
>   Thomas

src/hotspot/share/gc/g1/g1RemSet.cpp line 234:

> 232:           // either.
> 233:         }
> 234:         cur = next;

Wait a second, is it really the same? `next` is from fetch-then-add, so it is "old" value? Original code re-reads `_cur_dirty_regions`, which looks more like "new" value after fetch-then-add?

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

PR Review Comment: https://git.openjdk.org/jdk/pull/29345#discussion_r2716035412