[jdk21u-dev] RFR: 8315373: Change VirtualThread to unmount after freezing, re-mount before thawing

[Aleksey Shipilev]

On Tue, 13 Feb 2024 10:19:19 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> Update: The general consensus to this seems to be that there are no objections. It would be preferable to get this into 21.0.4 (early after 21.0.3 rampdown starts in end of Feb) unless there are very good reasons to get it into 21.0.3.

Thanks for update!

I think there is a reason to get it to 21.0.3. The major driver for JDK 21 is Loom, which was made production-ready in JDK 21. The work done in 21u right now is effectively stabilizing Loom for production use. Shipping 21.0.3 with known bugs would likely delay wide-scale production testing/usage to 21.0.4. This is the crux of the problem, I think: 21u is what customers would ultimately test Loom with.

This stack of patches was in mainline for a while, and only touches the Loom paths, so the risk appears to be low for non-Loom usages. Yes, there is a minor risk of Loom regressions, but unless we assume that JDK 22 GA would be widely used/tested, we would not be in better position for these backports in 21.0.4.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/245#issuecomment-1946009990