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

Igor Veresov igor.veresov at oracle.com
Tue Sep 6 14:38:14 PDT 2011


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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