On Wed, Jul 17, 2013 at 01:22:22PM +0800, Sam Ben wrote: > On 07/15/2013 11:20 PM, Mel Gorman wrote: > >Currently automatic NUMA balancing is unable to distinguish between false > >shared versus private pages except by ignoring pages with an elevated > > What's the meaning of false shared? > Two tasks may be operating on a shared buffer that is not aligned. It is expected that will at least cache align to avoid CPU cache line bouncing but the buffers are not necessarily page aligned. A page is the minimum granularity we can track NUMA hinting faults so two tasks sharing such a page will appear to be sharing data when in fact they are not. -- Mel Gorman SUSE Labs -- 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>