RFR: 8064814: Print more helpful error message when getting OOM due to low Java Heap base when running with CompressedOops

[David Holmes]

Hi Poonam,

The changes seem okay to me - I think Coleen would need to confirm the 
accuracy of the actual words used.

Note that this enhancement requires approval before it can be pushed.

Thanks,
David

On 27/05/2016 7:39 AM, Poonam Bajaj Parhar wrote:
> Hello,
>
> Gentle reminder!
>
> Thanks,
> Poonam
>
> On 5/10/2016 1:04 PM, Poonam Bajaj Parhar wrote:
>> Hello,
>>
>> Could I get reviews for this small change, please!
>> http://cr.openjdk.java.net/~poonam/8064814/webrev.00/
>>
>> Thanks,
>> Poonam
>>
>> On 5/5/2016 6:49 AM, poonam.bajaj at oracle.com wrote:
>>> Hello,
>>>
>>> Please review this simple fix for:
>>> Bug 8064814 <https://bugs.openjdk.java.net/browse/JDK-8064814> : Print
>>> more helpful error message when getting OOM due to low Java Heap base
>>> when running with CompressedOops
>>> Webrev: http://cr.openjdk.java.net/~poonam/8064814/webrev.00/
>>>
>>> Problem: We can encounter out-of-native-heap errors when the Java heap
>>> is either placed in the first 4gb or 32gb address space when running
>>> with the CompressedOops. The Java Heap base in these cases limits and
>>> blocks the growth of the native heap.
>>>
>>> Fix: Print better error message giving an indication that the
>>> out-of-native heap error may be due to the use of CompressedOops and how
>>> it can be resolved. These changes also check if the process is running
>>> in 32-bit mode and then print the appropriate 32-bit or 64-bit related
>>> suggestions.
>>>
>>> Testing: Manual testing
>>>
>>> Thanks,
>>> Poonam
>>>
>>
>