[crac] RFR: Persist memory in-JVM

[Anton Kozlov]

On Tue, 5 Sep 2023 07:03:42 GMT, Radim Vansa <rvansa at openjdk.org> wrote:

> I have no issues with restoring the memory just from the info in MemoryLoader

 👍 
 
 > We would need to allocate a new memory, get into impl details of the bitmap (`_committed._map`) etc.; I wouldn't do it in release mode for sure. Given the complexity the check seems as an overkill.

Hmm, that indeed does not look nice. Thinking about alternatives, we may have a boolean flag set to true during checkpoints only, and check the flag during operations with _committed, asserting accidental change. I agree that the checks should be pretty cheap in production and easy to implement.

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PR Review Comment: https://git.openjdk.org/crac/pull/95#discussion_r1319650962