RFR: 8330523: Reduce runtime and improve efficiency of KeepAliveTest [v3]

[Christoph Langer]

On Wed, 24 Apr 2024 14:04:47 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

>> Yes, but there's always new instance per test. One could certainly change it to use a global static semaphore...
>
> Ah, good point, missed that.

Nevertheless, I changed synchronization to a static Phaser in my newest version.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18817#discussion_r1578996144