[concurrency-interest] @Contended (JEP-142)

Mohan Radhakrishnan radhakrishnan.mohan at gmail.com
Fri Nov 30 03:25:23 EST 2012


Isn't this specific to the processor ? The JVM will know how to calculate
cache line sizes dynamically and then pad ?

Thanks,
Mohan

On Fri, Nov 30, 2012 at 6:13 AM, Vitaly Davidovich <vitalyd at gmail.com>wrote:

> What use case is that? If we're saying that this annotation is purely a VM
> hint, then I don't think it needs to surface at all in java code.
>
> How much overhead is there for having these be runtime retained? I don't
> imagine many classes will have themselves or fields annotated with it, so
> it may not be much of a concern.  However, making it runtime from the get
> go puts us into a compatibility corner.
>
> Sent from my phone
> On Nov 29, 2012 7:35 PM, "Remi Forax" <forax at univ-mlv.fr> wrote:
>
>> On 11/30/2012 01:06 AM, Vitaly Davidovich wrote:
>>
>>>
>>> Oh I see - you're saying CLASS retention is sufficient.  I guess that
>>> depends on whether java level tooling (or generally, some java code period)
>>> should be able to grab this info or not.
>>>
>>> Sent from my phone
>>>
>>>
>> if the rentention policy is CLASS, I believe that there is no way using
>> the reflection API to get a runtime failure if the annotation class is not
>> present in the classpath.
>>
>> Rémi
>>
>>
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