> I still don't think that's possible. Please explain how you expect > to change the semantics of the streaming mapping API to allow multiple > mappers without having explicit serialization points that are visible > to all users. For simplicity, let's assume a cache coherent system I would agree. It's not just about barriers but in many cases where you have multiple mappings by hardware devices the actual hardware interface is specific to the devices. Just take a look at the fencing in TTM and the graphics drivers. Its not something the low level API can deal with, it requires high level knowledge. Alan -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>