On Mon, Jan 30, 2017 at 09:05:49AM +0530, Anshuman Khandual wrote: > VMA which contains CDM memory pages should be marked with new VM_CDM flag. > These VMAs need to be identified in various core kernel paths for special > handling and this flag will help in their identification. > > Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx> Why doing this on vma basis ? Why not special casing all those path on page basis ? After all you can have a big vma with some pages in it being cdm and other being regular page. The CPU process might migrate to different CPU in a different node and you might still want to have the regular page to migrate to this new node and keep the cdm page while the device is still working on them. This is just an example, same can apply for ksm or any other kernel feature you want to special case. Maybe we can store a set of flag in node that tells what is allowed for page in node (ksm, hugetlb, migrate, numa, ...). This would be more flexible and the policy choice can be left to each of the device driver. Cheers, Jérôme -- 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>
