RFR(S): 8229422: Taskqueue: Outdated selection of weak memory model platforms

Andrew Haley aph at redhat.com
Tue Jan 14 15:05:43 UTC 2020


On 1/14/20 3:00 PM, Andrew Haley wrote:
> On 8/15/19 4:49 PM, Derek White wrote:
>> However, setting CPU_MULTI_COPY_ATOMIC for AArch64 would result in changing behavior (removing fence in taskqueue) that should be looked at and tested by the aarch64 folks, so if Andrew Haley agrees, I suggest deferring changing this AArch64 behavior to a separate issue.
> 
> Well, yes. What i don't understand is what any of this has to do with
> multi-copy atomicity. The fence is needed for _age.get() on all machines
> with relaxed memory consitency, AFAICS.

Ah, I found the answer in another thread:

http://mail.openjdk.java.net/pipermail/hotspot-dev/2013-March/008853.html

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