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

[Zhengyu Gu]

On Wed, 13 Jul 2022 19:02:39 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> 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.

Shenandoah SATB/IU both elide barrier on newly allocated objects. SATB barrier should guarantee they can only refer marked objects. Do I miss anything?

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