RFR: 8229517: Support for optional asynchronous/buffered logging [v11]

[Xin Liu]

On Thu, 6 May 2021 15:25:04 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Use LogTagSetMapping<LogTag::__NO_TAG>::tagset() instead of NULL pointer.
>
> src/hotspot/share/logging/logAsyncFlusher.hpp line 107:
> 
>> 105:   void writeback();
>> 106: 
>> 107:   // two AsyncLogMessage are equal if both _output and _message are same.
> 
> Decorators don't matter here?

This equals() is a placeholder, which is required by LinkedListImpl. 
I create a new PR to loose this constraint. if it works, I will remove this equals() member function.
https://github.com/openjdk/jdk/pull/3944

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PR: https://git.openjdk.java.net/jdk/pull/3135