Re: [rvm-research] Force allocation into specific space(MMTK/GC)

[Jipeng H. <hua...@cs...>]

Thanks, Daniel. Those places are really worth looking at and thinking
about but actually they were all in my consideration. And I defined my
new allocator and returned the allocator in the first few lines of
pickAllocator if the RVMType's my own object type(There I didn't use
RVMMethod to determine whether to return my own allocator). And I don't
think MutatorContext.checkAllocator should affect my own allocator since
my own allocator didn't fall into those several if checks.

By the way, I forgot to mention that I put my own object type in
RVM.txt(Hope that shouldn't be the reason).

Thanks,
Jipeng
On Tue, 2011-07-26 at 09:30 +1000, Daniel Frampton wrote:
> This is largely from memory, but hopefully it helps.
>  
> I think pickAllocator is not called for each allocation, but when
> compiling allocation sites (an exception being unresolved allocation
> sites, which may also means the method information is null/not
> available).
>  
> MutatorContext.checkAllocator is also called during allocation and may
> change the allocator (e.g., based on size).
>  
> You can look at RuntimeEntrypoints.unresolvedScalar, and at
> org.jikesrvm.mm.mminterface.MemoryManager.allocateScalar (or
> allocateArray), to see more of the allocation path.
>  
> Cheers,
> Daniel.
> 
> 
> On Tue, Jul 26, 2011 at 12:52 AM, Jipeng Huang
> <hua...@cs...> wrote:
>         Hi all,
>         
>         I am doing something that may interfere with GC/MMTK, but I
>         always got
>         unexpected behaviors. In MemoryManager pickAllocator, I added
>         several
>         lines to return my own allocator based on the RVMType. Later
>         when some
>         conditions occur, I used new operation to allocate my own
>         object. And
>         there to avoid GC affecting the allocation, I defered GC. But
>         interestingly, I found sometimes it didn't execute
>         pickAllocator for
>         that new allocation, i.e, my own allocator sometimes wouldn't
>         be got and
>         the object in turn wouldn't be allocated into my space. I
>         wonder if
>         there're any other places that return an allocator before
>         allocating
>         space.
>         
>         Thanks,
>         Jipeng
>         
>         
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