RFR: 8324995: Shenandoah: Skip to full gc for humongous allocation failures [v3]

[Kelvin Nilsen]

On Wed, 31 Jan 2024 21:50:06 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Shenandoah degenerated cycles do not compact regions. When a humongous allocation fails, it is likely due to fragmentation which is better addressed by a full gc.
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix typo in comment

There is a separate issue going that has been uncovered by testing of this PR.  We have observed that VM_HandshakeAllThreads::doit() very rarely iterates very slowly over threads.  This has been observed with HandShakeForDeflation causing a pause of over 280s.  I will file a JBS ticket for this.

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PR Comment: https://git.openjdk.org/jdk/pull/17638#issuecomment-1934700201