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

[Johan Sjölen]

On Tue, 25 Feb 2025 09:09:03 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/runtime/globals.hpp line 1874:
> 
>> 1872:           "Memory budget (in bytes) for the buffer of Asynchronous "        \
>> 1873:           "Logging (-Xlog:async).")                                         \
>> 1874:           range(DEBUG_ONLY(96) NOT_DEBUG(100*K), 50*M)                      \
> 
> Why 96 when the test uses 192? I guess it could be anything.

Short answer: It should be 192, I was confused.

Long answer: I picked 96 because that's what I used when hard-coding the buffer size, but I forgot that we have 2 buffers who share `AsyncLogBufferSize` and 192/2 = 96.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22770#discussion_r1969328829