[crac] Integrated: 8373784: [CRaC] VM Option to require perfect CPU fit

[Radim Vansa]

On Tue, 6 Jan 2026 14:41:20 GMT, Radim Vansa <rvansa at openjdk.org> wrote:

> Right now CRaC will refuse to restore from the image if it is not compatible with current CPU as it assumes extra features. This check can be only relaxed with -XX:+UnlockExperimentalVMOptions -XX:+IgnoreCPUFeatures.
> 
> In scenarios with -XX:CRaCIgnoreRestoreIfUnavailable it might be favorable to skip the restore and proceed with running the application from scratch with all CPU features if the image has these restricted. Therefore I propose to create a new option -XX:CheckCPUFeatures with these values:
> * compatible - this is the current behaviour (default)
> * exact - require CPU features from the image to match perfectly
> * skip - the same behaviour as `-XX:+IgnoreCPUFeatures`.
> 
> The current `-XX:+IgnoreCPUFeatures` option will be deprecated.

This pull request has now been integrated.

Changeset: af6c8445
Author:    Radim Vansa <rvansa at openjdk.org>
URL:       https://git.openjdk.org/crac/commit/af6c8445eff80134cc5c6f814f5c550b3b0f9333
Stats:     155 lines in 9 files changed: 141 ins; 0 del; 14 mod

8373784: [CRaC] VM Option to require perfect CPU fit

Reviewed-by: jkratochvil, tpushkin

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PR: https://git.openjdk.org/crac/pull/285