RFR: 8315923: pretouch_memory by atomic-add-0 fragments huge pages unexpectedly [v12]

[David Holmes]

On Tue, 12 Dec 2023 02:22:12 GMT, Liming Liu <duke at openjdk.org> wrote:

>> I don't have time to look at this for now and step back to wait for others. But I don't want to hold up this patch - if there are enough reviewers that ok it, please don't wait for me. 
>> 
>> As I wrote earlier, the patch itself is mechanically fine. The test has aspects I don't understand, and I am worried about concurrent usage of the about-to-be-pretouched area by other threads.
>
> Hi, @tstuefe , @kimbarrett , @dholmes-ora & @jdksjolen . Could you please continue to review this?

Sorry @limingliu-ampere , as I stated originally I can't comment on the actual use of MADV_POPULATE_WRITE so can't Review this.

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PR Comment: https://git.openjdk.org/jdk/pull/15781#issuecomment-1851419463