RFR: 8229517: Support for optional asynchronous/buffered logging [v21]

[Volker Simonis]

On Tue, 25 May 2021 05:23:56 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> This patch provides a buffer to store asynchrounous messages and flush them to
>> underlying files periodically.
>
> Xin Liu has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Remove AsyncLogWriter::flush() from os::shutdown().
>    
>    When jvm aborts, it won't invoke AsyncLogWriter::flush() and guarantee
>    not to hinder the aborting process.
>    
>    Run all unified logging tests in async mode.
>  - Biased to the thread which is taking buffer lock.

I'm fine with the latest version of this patch.

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Marked as reviewed by simonis (Reviewer).

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