RFR: Handle old, pinned regions [v7]

[William Kemper]

On Thu, 4 Aug 2022 21:39:01 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

> 



> Or does the use of the marking bitmap always ensure that our closures are never trying to walk over dead objects by trying to determine their size?

Yes - exactly. The mark bitmap is used to prevent the remembered set scan from touching any unmarked (i.e., garbage) objects. Before we clear the bitmap for the next old generation mark, we make the old regions parseable (coalesce and fill).

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PR: https://git.openjdk.org/shenandoah/pull/149