RFR: 8292329: Enable CDS shared heap for zero builds

[Thomas Stuefe]

On Tue, 23 Aug 2022 16:57:20 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> > Stupid question, does that not mean that the CDS dump generated at build time is not usable with the VM at runtime if that is started with default options?
> 
> The CDS archive is still useable.
> 
> * If G1 is used at runtime, the shared heap is mmaped
> * If a non-G1 collector is used, all the objects in the shared heap will be copied into the Java heap.
> 
> See comments near `HeapShared::can_use()`:
> 
> https://github.com/openjdk/jdk/blob/d24b7b7026cf85f1aecf44f60819762872cfd5c1/src/hotspot/share/cds/heapShared.hpp#L151-L157

Thanks for the clarification!

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PR: https://git.openjdk.org/jdk/pull/9984