[aarch64-port-dev ] RFR 8135018: AARCH64: Missing memory barriers for CMS collector

[Andrew Haley]

On 12/13/19 1:38 PM, Doerr, Martin wrote:
> I guess the change would apply cleanly on top of
> http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/4a179f93d775
> 
> If it's easy to backport (I haven't tried) doing that one first should be the preferred way.
> 
> But if that change is not wanted in 8u, I'll be fine with Ix's version.
> Having the UseCondCardMark code only at some places wouldn't break anything. There's no consistency requirement.

OK, but I'm trying to understand what is going on. Either UseCondCardMark is
supported by AArch64 in JDK 8 or it is not. If it is not, then all we have
to do is insert any missing memory barriers. If it's supposed to be, then
we should be consistent.

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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