On Thu, Aug 01, 2013 at 10:43:27AM +0530, Srikar Dronamraju wrote: > * Mel Gorman <[email protected]> [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 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/
