On 10/23/2016 09:31 PM, Anshuman Khandual wrote: > VMAs containing coherent device memory should be marked with VM_CDM. These > VMAs need to be identified in various core kernel paths and this new flag > will help in this regard. ... and it's sticky? So if a VMA *ever* has one of these funky pages in it, it's stuck being VM_CDM forever? Never to be merged with other VMAs? Never to see the light of autonuma ever again? What if a 100TB VMA has one page of fancy pants device memory, and the rest normal vanilla memory? Do we really want to consider the whole thing fancy? This whole patch set is looking really hackish. If you want things to be isolated from the VM, them it should probably *actually* be isolated from the VM. As Jerome mentioned, ZONE_DEVICE is probably a better thing to use here than to try what you're attempting. -- 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>