RFR: 8272807: Permit use of memory concurrent with pretouch

[Aleksey Shipilev]

On Thu, 26 Aug 2021 02:20:50 GMT, David Holmes <dholmes at openjdk.org> wrote:

> That said, how can we be actively using an oop located in a page that we are also in the process of pre-touching?

I think that is what this patch is supposed to enable: concurrent pretouch. Where "concurrent" might mean "concurrent with application code". For example, init the heap, let the Java code run, and then use a background GC worker to concurrently pre-touch the heap. ("Pre-" becomes a little fuzzy here...).

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PR: https://git.openjdk.java.net/jdk/pull/5215