> What's your suggestions? a new zone or a new migratetype? > Maybe add a new zone will change more mm code. I don't understand this code well enough (yet) to make a recommendation. I think our primary concern may not be "how much code we change", but more "how can we minimize the run-time impact on systems that don't have any mirrored memory. Just putting all the heavy work behind a CONFIG option isn't sufficient ... we want enterprise distributions to ship with the option turned on ... even though most machines won't be using this feature. -Tony -- 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