review(XS): 7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)

Y. S. Ramakrishna y.s.ramakrishna at oracle.com
Tue Sep 6 15:49:20 PDT 2011


Looks good to me.

-- ramki

On 09/06/11 14:38, Igor Veresov wrote:
> Hotspot will fail allocating the heap on linux >= 2.6.32 if there're more than 1 large page present but not enough to cover all the heap. The solution is to try small pages if mmap(MAP_HUGETLB) fails and also apply madvise(MADV_HUGETLB) in case some pages are freed by the time we touch this space. 
> 
> Webrev: http://cr.openjdk.java.net/~iveresov/7087583/webrev.00/
> 
> Thanks!
> igor
> 


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