On Wed 20-07-16 14:45:01, Michal Hocko wrote: [...] > I was talking to Mel (CCed) and he has raised a good question. So if you > encounter a page under migration and fail to share the pmd with it how > can you have a proper content of the target page in the end? Hmm, I was staring into the code some more and it seems this would be OK because we should hit hugetlb_no_page with the newel instantiated pmd and associate it with a page from the radix tree. So unless I am missing something the corruption shouldn't be possible. I believe the post pmd_populate race is still there, though, so I believe the approach should be rethought. -- Michal Hocko SUSE Labs -- 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>