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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/