On 10/09/2015 03:36 AM, Xishi Qiu wrote: > I mean the mirrored region can not at the middle or end of the zone, > BIOS should report the memory like this, > > e.g. > BIOS > node0: 0-4G mirrored, 4-8G mirrored, 8-16G non-mirrored > node1: 16-24G mirrored, 24-32G non-mirrored > > OS > node0: DMA DMA32 are both mirrored, NORMAL(4-8G), MOVABLE(8-16G) > node1: NORMAL(16-24G), MOVABLE(24-32G) I understand if the mirrored regions are always at the start of the zone today, but is that somehow guaranteed going forward on all future hardware? I think it's important to at least consider what we would do if DMA32 turned out to be non-reliable. -- 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>