On Tue, Dec 02, 2014 at 09:58:25AM +0100, Jan Kara wrote: > On Mon 01-12-14 17:58:01, Johannes Weiner wrote: > > The only way a VMA can have shared and writable semantics is with a > > backing file. > OK, one always learns :) After some digging I found that MAP_SHARED | > MAP_ANONYMOUS mappings are in fact mappings of a temporary file in tmpfs. > It would be worth to mention this in the changelog I believe. Otherwise > feel free to add: > Reviewed-by: Jan Kara <jack@xxxxxxx> Thanks, Jan. I updated the changelog to read: Shared anonymous mmaps are implemented with shmem files, so all VMAs with shared writable semantics also have an underlying backing file. -- 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>