[jmm-dev] [concurrency-interest] Will the real memory read barrier please stand up?

Doug Lea dl at cs.oswego.edu
Mon Nov 24 00:09:54 UTC 2014

On 11/20/2014 05:25 AM, Andrew Haley wrote:
> On 20/11/14 10:12, Joe Bowbeer wrote:
>> As far as I can tell, the cookbook hasn't been updated yet for ARMv8.

Mainly out of conservatism given the history of revising ARM and POWER
entries multiple times over the years, sometimes based on incomplete or
wrong information. It seems worth waiting for multiple validations,
including experience from the ARMv8 hotspot port. This is cruel to Andrew
(sorry!) but still better than alternatives.

>> looks like the following might be helpful in updating the recipes.
>> http://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html
> Yes, it looks like the DMB LD is now stronger if, that page is right.
> It'd be nice if someone could point me at the language in the
> ARMv8 spec that this derives from.

I'm hoping that someone from ARM answers this.


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