Presentation: Understanding OrderAccess

[David Holmes]

On 23/11/2016 8:40 PM, Andrew Haley wrote:
> On 23/11/16 05:08, David Holmes wrote:
>> This is a presentation I recently gave internally to the runtime and
>> serviceability teams that may be of more general interest to hotspot
>> developers.
>>
>> http://cr.openjdk.java.net/~dholmes/presentations/Understanding-OrderAccess-v1.1.pdf
>
> That's pretty cool; nicely done.

Thanks Andrew.

> I'd quibble about a couple of minor things:
>
> In Data Race Example: Using Barriers, the use of a naked StoreStore is
> rather terrifying.  In real-world code it'd be better to use
> StoreStore|LoadStore or release unless the author really knows what
> they're doing.

It would all depend on the exact code of course. The simple flag+data 
example doesn't require it.

> The use of "fence" to mean a full barrier is rather idiosyncratic; it
> confused me the first time I saw it in HotSpot source, and from time
> to time it still does.

Yeah not sure the detailed history there - possibly related to x86 mfence.

Cheers,
David

> But, as I said, these are minor criticisms.
>
> Andrew.
>