Mel Gorman <mgorman@xxxxxxx> writes: > zone_reclaim_mode causes processes to prefer reclaiming memory from local > node instead of spilling over to other nodes. This made sense initially when > NUMA machines were almost exclusively HPC and the workload was partitioned > into nodes. The NUMA penalties were sufficiently high to justify reclaiming > the memory. On current machines and workloads it is often the case that > zone_reclaim_mode destroys performance but not all users know how to detect > this. Non local memory also often destroys performance. > Favour the common case and disable it by default. Users that are > sophisticated enough to know they need zone_reclaim_mode will detect it. While I'm not totally against this change, it will destroy many carefully tuned configurations as the default NUMA behavior may be completely different now. So it seems like a big hammer, and it's not even clear what problem you're exactly solving here. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only -- 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>