Current heap layout of generational mark-sweep GC

[Neo Jia]

hi,

I am wondering that for the generational mark-sweep GC, if the block
offset shared array is the last allocated object on the CHeap.

The following is my understanding of the current heap layout:

1. The nursery space is on the lowest address
2. The mature space is following the nursery address.
3. The permanent space is following the nursery address at a higher address.
4. The card table is allocated from the end of the permanent space,
the regions inside it will be mapped to these previous three spaces
sequentially, from lower address to higher address.
5. The block offset shared array used by the mature space will be
allocated at the end of the card table area, which is used by mature
space. And the virtual space size of this area will be set according
to the mature space and word bits.

So, is there any space allocated following?

Thanks,
Neo
-- 
I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!