On 10/07/2013 06:29 AM, Mel Gorman wrote: > This patch implements a system-wide search for swap/migration candidates > based on total NUMA hinting faults. It has a balance limit, however it > doesn't properly consider total node balance. > > In the old scheme a task selected a preferred node based on the highest > number of private faults recorded on the node. In this scheme, the preferred > node is based on the total number of faults. If the preferred node for a > task changes then task_numa_migrate will search the whole system looking > for tasks to swap with that would improve both the overall compute > balance and minimise the expected number of remote NUMA hinting faults. > > Not there is no guarantee that the node the source task is placed > on by task_numa_migrate() has any relationship to the newly selected > task->numa_preferred_nid due to compute overloading. > > [[email protected]: Do not swap with tasks that cannot run on source cpu] > Signed-off-by: Peter Zijlstra <[email protected]> > Signed-off-by: Mel Gorman <[email protected]>
Reviewed-by: Rik van Riel <[email protected]> -- All rights reversed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
