Integrated: 8166554: Avoid compilation blocking in OverloadCompileQueueTest.java

[Evgeny Nikitin]

On Mon, 7 Sep 2020 09:59:40 GMT, Evgeny Nikitin <enikitin at openjdk.org> wrote:

> **Problem explanation**
> 
> 1. The stress test [uses 0.8 of allowed running
> time](https://hg.openjdk.java.net/jdk/jdk/file/e10f558e1df5/test/hotspot/jtreg/compiler/codecache/stress/CodeCacheStressRunner.java#l40)
> + 10 seconds, thus exceeding the limit; 2. 10 additional seconds are [given by the
> VM](https://hg.openjdk.java.net/jdk/jdk/file/6db0cb3893c5/src/hotspot/share/runtime/vmOperations.cpp#l388) for stuck
> compiler threads to finish; 3. Compiler threads aren't progressing due to the compilation being blocked; 4. Compilation
> is blocked via WhiteBox by the test, its lockUnlock thread; 5. The lockUnlock thread doesn't unblock the compilation
> because [it is a
> daemon](https://hg.openjdk.java.net/jdk/jdk/file/e10f558e1df5/test/hotspot/jtreg/compiler/codecache/stress/Helper.java#l59),
> it is stopped in the middle of the sleep.
> **Solution**
> 
> Since the 'lockUnlock' is started via InfiniteLoop, it's not possible to un-daemon it. So I just turned the lockUnlock
> method into a Thread descendant, which got joined in the end.

This pull request has now been integrated.

Changeset: 2cceeedf
Author:    Evgeny Nikitin <enikitin at openjdk.org>
Committer: Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/2cceeedf
Stats:     50 lines in 1 file changed: 15 ins; 32 del; 3 mod

8166554: Avoid compilation blocking in OverloadCompileQueueTest.java

Reviewed-by: shade

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PR: https://git.openjdk.java.net/jdk/pull/46