RFR: 8335217: Fix memory ordering in ClassLoaderData::ChunkedHandleList

[Zhengyu Gu]

On Thu, 27 Jun 2024 07:55:47 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Seems appropriate. It isn't very clear which methods are actually used lock-free.
> 
> Thanks


Thanks for reviewing.  

I believe the lock-free method (`ClassLoaderData::ChunkedHandleList::oops_do()`) is called during class loader root scanning by GCs. Z and Shenandoah GC scan class loader roots in concurrent phase.

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PR Comment: https://git.openjdk.org/jdk/pull/19919#issuecomment-2194579148