RFR: JDK-8262326: MaxMetaspaceSize does not have to be aligned to metaspace commit alignment

[Ioi Lam]

On Thu, 25 Feb 2021 06:50:38 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Currently MaxMetaspaceSize is aligned to commit alignment in Metaspace::ergo_initialize(). 
> 
> That is unnecessary. MaxMetaspaceSize is just a number to compare the metaspace commit charge against. The fact that we commit in discrete uniform steps (since JEP-387, the size of a commit granule) makes no difference to that comparison.
> 
> This alignment introduced subtle display errors where the default value of max_uintx was aligned down, and that not-quite-max_uintx was not recognized to mean "infinite" (see JDK-8262099).
> 
> -----------
> 
> Tests: GA, nightlies at SAP

LGTM

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Marked as reviewed by iklam (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2721