[jdk19] RFR: 8290250: Shenandoah: disable Loom for iu mode

Wed Jul 13 19:06:21 UTC 2022

On Wed, 13 Jul 2022 18:39:51 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> Please review this trivial patch to disable Loom for Shenandoah iu mode (an experimental feature).
> 
> Test:
> - [x] hotspot_gc_shenandoah
> - [x] jdk_loom with Shenandoah + iu
> - [x] hotspot_loom with Shenandoah + iu

Speaking of IU mode, how does Shenandoah IU mode deal with barrier elision on newly allocated objects? It was only valid in CMS because the entire young generation was traversed when terminating the concurrent marking, so that unvisited pointers could be found.

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PR: https://git.openjdk.org/jdk19/pull/140