Segmentation fault with NUMA aware ParallelScavange GC
lokesh.gidra at yahoo.com
Fri Jul 29 07:25:04 UTC 2011
>The only thing I can think of is that we started using
>madvise(MADV_FREE) to uncommit pages in lgrp chunks instead of doing
>mmap over mmap. I've tested it with earlier kernels and it works fine.
>It could be the semantics of MADV_FREE somehow changed. jdk6u25 has
>still the hotspot that would do mmap. So running it would confirm the
But isn't madvise(MADV_FREE) just frees the pages rather than removing the vma region all together?
Can you please tell me which kernel version did it work fine with? I tried with 6b20 and its still the same. I will try with jdk6u25 as well and let you know.
>Alternatively, if you're open to building hotspot, I can send you a
>patch to try.
Yes, I am. Please send me the patch.
More information about the hotspot-gc-dev