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

src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp line 490:

> 488:   bool is_humongous = words > ShenandoahHeapRegion::humongous_threshold_words();
> 489: 
> 490:   if (try_set_alloc_failure_gc(is_humongous)) {

I think we can replace this with assert(words <= ShenandoahHeapRegion::humongous_ghreshold_words()

We do not evacuate humongous objects.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17638#discussion_r1481751566