On Thu, Aug 01, 2013 at 10:43:27AM +0530, Srikar Dronamraju wrote: > * Mel Gorman <mgorman@xxxxxxx> [2013-07-15 16:20:19]: > > > When a preferred node is selected for a tasks there is an attempt to migrate > > the task to a CPU there. This may fail in which case the task will only > > migrate if the active load balancer takes action. This may never happen if > > Apart from load imbalance or heavily loaded cpus on the preferred node, > what could be the other reasons for migration failure with > migrate_task_to()? These were the reasons I expected that migration might fail. > I see it almost similar to active load balance except > for pushing instead of pulling tasks. > > If load imbalance is the only reason, do we need to retry? If the task > is really so attached to memory on that node, shouldn't we getting > task_numa_placement hit before the next 5 seconds? > Depends on the PTE scanning rate. -- 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>