Re: [rvm-research] Understanding GC implementations

I'll start writing a user guide page about how an MMTk plan works.

Email me direct with specific questions and I'll address them first.

cheers,
Robin

On 30/04/13 13:02, Rifat Shahriyar wrote:
> Hello,
> Garbage collectors in Jikes RVM work in phases. There are phases for
> mutator and collector. There are no explicit calls to invoke mark and
> sweep phases.
>
> For mark sweep collector, marking is done by tracing the heap. Tracing
> starts from the roots (see STACK_ROOTS and ROOTS phases in
> SimpleCollector.java) and finishes with a transitive closure (see
> CLOSURE phase in MSCollector.java). Sweeping is done by walking
> through the heap and sweep objects that are not marked (see
> msSpace.release method of RELEASE phase in MS.java).
>
> if you want to know how the phases are executed have a look at the
> processPhaseStack method in Phase.java.
>
>
> Regards
> -
> Rifat
> Australian National University
>
> On 30/04/13 6:31 AM, Thai, Richard P wrote:
>>
>> I’ve mentioned before that I was trying my hand at making a garbage
>> collector and that I wanted a better way towards understanding how
>> GC’s operate in JikesRVM. I’ve read through how memory allocation
>> works in JikesRVM, but my understanding of garbage collectors remains
>> unchanged. Maybe a better approach would be to map a garbage
>> collector who implementation I know (mark sweep for instance), and
>> understand where the key phases of its execution are. Would anyone
>> know where I’d be able to find the explicit calls to invoke the
>> **mark** and **sweep** phases?
>>
>> Best Regards,
>>
>> Richard Thai
>>
>>
>>
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>
>
>
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