Re: [rvm-research] Introducing AllocationStrategy annotation

Take a look at the @NonMoving annotation.

cheers


On 08/07/18 00:34, Ruben Peter Vervaeke wrote:
>
> Hi,
>
> My name is Ruben Vervaeke and I’m a Master student in Applied Computer 
> Science at the VUB in Belgium. For my thesis project I need to 
> introduce a new annotation in the JDK (provisionally called 
> AllocationStrategy). I need to make such an annotation available to 
> the runtime rvm. The idea is that a developer can hint to the rvm that 
> certain heap allocations will be written a lot or will be written once 
> (or few times). Using this information the rvm should be able to 
> decide a specific allocation plan for the object(s) in question. This 
> is to support a hybrid memory model that can switch between 
> conventional DRAM memory hardware and NVM-based memory hardware.
>
> The focus for me lies on making such an annotation available to the 
> rvm, so it can decide what allocation plan to use. Another PhD student 
> has already modified the rvm for supporting the hybrid memory model 
> (using conventional DRAM or NVM memory).
>
> My question is: is it possible to make such an annotation available to 
> the rvm at allocation-time? If so, what would be the steps to take to 
> achieve this?
>
> An initial challenge that comes to mind: how to add an annotation to 
> the JDK library and use it in the RVM codebase?
>
> The declaration of this annotation in the JDK would look like this:
>
> @Retention(RetentionPolicy.RUNTIME)
>
> @Target({ElementType.CONSTRUCTOR, ElementType.FIELD, ElementType.TYPE})
>
> public @interface AllocationStrategy {
>
> MutationFrequency mutationFrequency();
>
> }
>
> public enum MutationFrequency {
>
>                 NONE,
>
>                 LOW,
>
>                 MID,
>
>                 HIGH;
>
> }
>
> The semantics of the annotation:
>
>   * CONSTRUCTOR: when declared on a specific constructor,
>     instantiations of the class using that constructor would be
>     allocated with NVM/DRAM in mind
>   * FIELD: when declared on a field, instantiations of the class type
>     that are immediately assigned to that field would be allocated
>     with NVM/DRAM in mind
>   * TYPE: when declared on a class, instantiations of that class would
>     be allocated with NVM/DRAM in mind
>
>
>
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