RFR: 8365512: Replace -Xcomp with -Xmixed for AOT assembly phase

[Aleksey Shipilev]

On Thu, 14 Aug 2025 13:21:49 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> src/hotspot/share/cds/cdsConfig.cpp line 652:
>> 
>>> 650:         // -Xcomp triggers blocking compilation for all called methods,
>>> 651:         // but during AOT assembly phase we should AOT compile in parallel
>>> 652:         // (and not blocking) only methods collected during training run.
>> 
>> Suggestion:
>> 
>>         // Improve testing time with AOT and -Xcomp.
>>         // AOT assembly phase compiles methods collected during training run
>>         // with blocking compilation requests. There is no reason to compile the rest
>>         // of the core/infrastructure methods with aggressive/blocking compilation.
>
> Thank you @shipilev for looking on this.
> 
>> with blocking compilation requests.
> 
> AOT compilation requests are not blocking. We submit bunch of requests for the same compilation level and only then wait when  queues are empty.
> 
> With -Xcomp we wait each compilation request. 
> 
> So I want to use "with non-blocking compilation requests. ". There rest of suggested comment is fine.

Ah yes, right, d'uh. I wrote some of that code! Let me rewrite the comment...

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PR Review Comment: https://git.openjdk.org/jdk/pull/26767#discussion_r2276663001