On Sun, Dec 09, 2012 at 08:36:31PM +0000, Mel Gorman wrote: > Either way, last night I applied a patch on top of latest tip/master to > remove the nr_cpus_allowed check so that numacore would be enabled again > and tested that. In some places it has indeed much improved. In others > it is still regressing badly and in two case, it's corrupting memory -- > specjbb when THP is enabled crashes when running for single or multiple > JVMs. It is likely that a zero page is being inserted due to a race with > migration and causes the JVM to throw a null pointer exception. Here is > the comparison on the rough off-chance you actually read it this time. Are you talking about huge zero page, right? I've fixed a race in huge zero page implementation recently[1]. Symptoms were similar -- SIGSEGV in JVM. The patch is in mmotm-2012-12-05-16-56 and later. [1] http://lkml.org/lkml/2012/11/30/279 -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>