RFR: 8273916: Remove 'special' ranking [v3]

[Coleen Phillimore]

On Tue, 21 Sep 2021 21:50:27 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

>> Coleen Phillimore has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:
>> 
>>  - Remove blank line.
>>  - Merge branch 'master' into remove-special
>>  - Add comment about ThreadSMRDelete_lock
>>  - Remove "special" rank.
>>  - Partition safepoint checking and nonchecking lock ranks.  The nonchecking locks are always lower ranked than the safepoint checking locks because they cannot block.
>>  - Partition safepoint checking and nonchecking lock ranks.  The nonchecking locks are always lower ranked than the safepoint checking locks because they cannot block.
>
> src/hotspot/share/runtime/mutexLocker.cpp line 228:
> 
>> 226:   def(StringDedupIntern_lock       , PaddedMutex  , nosafepoint, true,  _safepoint_check_never);
>> 227:   def(ParGCRareEvent_lock          , PaddedMutex  , leaf,        true,  _safepoint_check_always);
>> 228:   def(CodeCache_lock               , PaddedMonitor, nosafepoint-3, true,  _safepoint_check_never);
> 
> nit: There is a comment in mutexLocker.hpp that rank of CodeCache_lock is special.

Thanks for noticing that.

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PR: https://git.openjdk.java.net/jdk/pull/5563