RFR: 8293873: Centralize the initialization of UL [v2]

[Johan Sjölen]

On Fri, 23 Sep 2022 13:47:05 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix copyright years
>
> src/hotspot/share/logging/logFileStreamOutput.hpp line 77:
> 
>> 75:   LogStdoutOutput() : LogFileStreamOutput(stdout) {
>> 76:     set_config_string("all=warning");
>> 77:   }
> 
> Since you are here :-)
> 
> Wonder whether `_config_string` and `_config_string_buffer_size` could be replaced by an inline `stringStream,` and then we could save the awkward string shuffling in `set_config_string()` and `add_to_config_string()`.

We can do that, but it requires a larger move from buffer pointer + length to outputStream pointers in UL's API:s to be effective.

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PR: https://git.openjdk.org/jdk/pull/10307