RFR: 8342382: Implementation of JEP G1: Improve Application Throughput with a More Efficient Write-Barrier [v5]

[Thomas Schatzl]

On Mon, 3 Mar 2025 15:17:27 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   * fix comment (trailing whitespace)
>>   * another assert when snapshotting at a safepoint.
>
> src/hotspot/share/gc/g1/g1YoungGCPostEvacuateTasks.cpp line 857:
> 
>> 855:     // We do not expect too many non-Java threads compared to Java threads, so just
>> 856:     // let one worker claim that work.
>> 857:     if (!_non_java_threads_claim && !Atomic::cmpxchg(&_non_java_threads_claim, false, true, memory_order_relaxed)) {
> 
> Do non-java threads have card-table-base?

This code should not be necessary (any more). Will remove.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23739#discussion_r1977853483