RFR: 8319200: Don't use test thread factory in ProcessTools.createLimitedTestJavaProcessBuilder() [v5]

[David Holmes]

On Fri, 10 Nov 2023 01:49:17 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

>> Test thread factory is a mode similar to VM flags and should not be used in ProcessTools.createLimitedTestJavaProcessBuilder(). Only createTestJavaProcessBuilder() should use it like jtreg VM options.
>> 
>> Adding the test thread factory requires the injection of arguments in the middle of the list. I don't think it makes sense to modify arguments in several places so I replaced it with the flag isLimited and moved all modifications in createJavaProcessBuilder().
>> 
>> Testing tier1-5.
>
> Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   variable was renamed.

Okay, sorry, I've misunderstood the nature of this issue. This change has no affect on whether jtreg runs a specific test (or set of tests) using the virtual thread wrapper to launch the test. This only affects code that uses ProcessTools and where the launched JVM would examine the `test.thread.factory` property. How many tests actually look at this property directly in code that is run via ProcessTools? The only tests that appear to look at this property are JDB and JDI tests, where we have a test framework that selects use of virtual threads based on this property. I couldn't find any test that would actually be affected by this. Sorry for the noise.

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PR Comment: https://git.openjdk.org/jdk/pull/16442#issuecomment-1805069620