RFR: 8291555: Implement alternative fast-locking scheme [v71]

[Roman Kennke]

On Thu, 4 May 2023 19:35:58 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Address @dholmes-ora's review comments
>
> src/hotspot/share/runtime/lockStack.inline.hpp line 53:
> 
>> 51:   bool is_owning = &JavaThread::cast(thread)->lock_stack() == this;
>> 52:   assert(is_owning == (get_thread() == thread), "is_owning sanity");
>> 53:   return is_owning;
> 
> This is going to require a re-test just to make sure that we don't have
> a code path into here from the VMThread when it is doing some
> JVM/TI stuff (again...).

I don't think so. That code did use JavaThread::cast(thread) before which would have fired. But that means I can leave out the JavaThread::cast() now. Let me do that change.

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PR Review Comment: https://git.openjdk.org/jdk/pull/10907#discussion_r1185508726