RFR: 8261213: [BACKOUT] MutableSpace's end should be atomic

[Thomas Schatzl]

On Fri, 5 Feb 2021 10:03:56 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> This reverts commit 1e0a1013efcb3983d277134f04f5e38f687e88c5.
> 
> Please review this backout of
> JDK-8259862: MutableSpace's end should be atomic
> 
> With that change:
> gc/TestVerifyDuringStartup.java with -XX:+UseParallelGC -XX:-UseNUMA fails with:
> # guarantee(false) failed: inline contiguous allocation not supported 
> 
> Testing:
> Locally (linux-x64) verified the failure is reproducible.
> Locally (linux-x64) verified no failure with the backout applied.
> Locally (linux-x64) hotspot:tier1 with -XX:+UseParallelGC -XX:-UseNUMA
>   is fine except for two serviceability tests that always fail locally with
>   UseParallelGC
> mach5 tier1-2 (in progress)

Lgtm.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2426