Question about ccs reservation, CDS and aarch64 specifics

Thomas Stüfe thomas.stuefe at
Sat Apr 18 06:26:24 UTC 2020

On Fri, Apr 17, 2020 at 10:48 AM Andrew Haley <aph at> wrote:

> On 4/16/20 6:51 PM, Thomas Stüfe wrote:
> > Good to know. So, zero based encoding does not have any special place in
> > your heart? 4G aligned base works just as well?
> Absolutely, yes.
Just occurred to me that aarch64 also relies on SharedBaseAddress being 4G
aligned. The default is 32G so it works out. If you modify it with
-XX:SharedBaseAddress, looks like the setting is ignored when the value is
not usable.

I guess that is all okay, maybe we just need to make it more explicit in


> --
> Andrew Haley  (he/him)
> Java Platform Lead Engineer
> Red Hat UK Ltd. <>
> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671

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