Re: [rvm-research] Understanding GC implementations

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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