Code review request: NMT: assertion failed: assert(rec->addr() + rec->size() <= cur->base()) failed: Can not overlap in memSnapshot.cpp

[Zhengyu Gu]

Updated the webrev based on David's comment.  Overlapping stacks is 
tracked by 8001743.

http://cr.openjdk.java.net/~zgu/8001591/webrev.01/

Thanks,

-Zhengyu

On 10/31/2012 9:32 PM, David Holmes wrote:
> On 1/11/2012 2:12 AM, Zhengyu Gu wrote:
>> NMT did not allow overlapped commit on memory regions, which is
>> incorrect. Committing overlapped memory regions should be allowed, as
>> long as the regions are within a reserved region.
>
> So the overlapping stacks that were detected is perfectly valid?
>
>>
>> http://cr.openjdk.java.net/~zgu/8001591/webrev.00/
>
> The renaming from contains_xx to contain_xx is not correct. "contains" 
> is the correct form to use, and "overlaps" rather than "overlap".
>
> Why the variable rename in VMMemPointerIterator::add_reserved_region? 
> Given it is initialized from current() then 'cur' seems quite 
> acceptable. Otherwise maybe it is current() that has the wrong name? 
> The renaming generates a lot of noise in the webrev - it is hard to 
> see the actual substantive changes that were made.
>
> Cheers,
> David
>
>
>> Thanks,
>>
>> -Zhengyu