RFR: 8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld

[Jon Masamitsu]

On 8/23/2013 5:30 AM, Stefan Johansson wrote:
> Hi all,
>
> I would like some reviews on my fix for bug:
> http://bugs.sun.com/view_bug.do?bug_id=8016155
>
> Webrev:
> http://cr.openjdk.java.net/~sjohanss/8016155/webrev.00
>
> Summary:
> On Linux we have a problem that we hit a SIGBUS when one NUMA node 
> runs out of large pages but the system as a whole has large pages 
> left. To avoid this we need to ease the requirement on which node the 
> memory should be allocated on. This can be done by using the memory 
> policy MPOL_PREFERRED, which prefers a certain node, instead of 
> MPOL_BIND, which requires a certain node.

With your change what happens when the system as a whole
runs out of large pages?

Jon

>
> Testing:
> To verify the fix I've run Kitchensink as describe in the bug report, 
> but also done some manual testing. To sanity test performance I've run 
> SPECjbb2005 with and without UseNUMA before and after the fix and I 
> haven't seen any problem. I also ran SPECjbb2005 on a system where one 
> NUMA node has been configured with no large pages while the other has 
> enough for the test. Without the fix this crashes immediately, but 
> with the fix the results are sane.
>
> Thanks,
> Stefan