RFR: 8317007: Add bulk removal of dead nmethods during class unloading [v4]

[Thomas Schatzl]

On Thu, 7 Dec 2023 15:46:44 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:
>> 
>>   ayang review; merge fixes :(
>
> src/hotspot/share/gc/shared/scavengableNMethods.hpp line 52:
> 
>> 50:   static void prune_nmethods_not_into_young();
>> 51:   // Remvoe unlinked (dead) nmethods.
>> 52:   static void prune_unlinked_nmethods();
> 
> Can they be merged into one API, pruning nmethods that are either unlinked or doesn't point into young-gen?

I left this out because at the time we unlink nmethods we have not moved the objects yet, only marked them. If we moved the class unloading to where `prune_nmethods_not_into_young` is, it might be possible. Going to file a CR to investigate this.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16767#discussion_r1425223536