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. > > [riel@xxxxxxxxxx: Do not swap with tasks that cannot run on source cpu] > Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Signed-off-by: Mel Gorman <mgorman@xxxxxxx> Reviewed-by: Rik van Riel <riel@xxxxxxxxxx> -- All rights reversed -- 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>