RFR: 8323807: Async UL: Add a stalling mode to async UL [v19]

[Johan Sjölen]

On Tue, 25 Feb 2025 09:04:04 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Self-review
>
> src/hotspot/share/logging/logConfiguration.cpp line 639:
> 
>> 637: 
>> 638:   out->print_cr("Asynchronous logging (off by default):");
>> 639:   out->print_cr(" -Xlog:async[:[mode]]");
> 
> This reminded me we need an update to the Java manpage/command-reference as well.

Fixed! See picture for a render.

![image](https://github.com/user-attachments/assets/105ff56a-d79e-49ee-bc91-89733af5b1b0)

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PR Review Comment: https://git.openjdk.org/jdk/pull/22770#discussion_r1969560749