Re: [rvm-research] How to record objects' read/write times

Hi,Robin

Thank you for your help very much!!   I have confirmed what you have
said. I can get most of them.
But I still have some doubts that I can't understand.


>
>> 1)
>> So,my first  doubt is   I can't find which variable to describe the
>> "the nursery size is set to 1/2 the available heap size ".
>> I mean the program set which variable to control this ?
>> May be the nursery size is set as the min of the range
>> (fixedNursery.value) ,and round to the max size (boundedNursery.value)
>> when the program is running ?
>
> Look at the method Plan#getPagesReserved().

1）
I have read this function, I think this function is about to get the
current reserved pages. I can't find its connection with the Nursery's
initial size in GenImmix.

But I really have seen that the nursery's initial size is 16M, half of
the nursery's max size( default max size is 32M).


>
> No, all spaces dynamically resize, but they don't change their virtual
> memory.  When we use a nursery in high memory, the base virtual address
> of the nursery is fixed at build time.  When we talk about "resizing"
> spaces, we simply mean using more or less of the space that has been set
> aside.
>

2)
I have read the functions about how to manage the nursery space
(GenImmix config).
In my opinion ,The nursery is a MonotonePageResource , and the nursery
space is allocated in the top of the heap.
But,when allocate pages ,the nursery's allocator will start from the
nursery's  low address ( Monotone.cursor / nursery.start ) to the heap
end ( Monotone.sentinel ).
And the nursery's virtual memory will not be occupied by other
discontiguous space,even if the nursery only use little of it.

Are these right?



Than you !


-- 
ChenXi.Wang

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