On Tue 25-08-15 15:03:00, Eric B Munson wrote: [...] > Would you drop your objections to the VMA flag if I drop the portions of > the patch that expose it to userspace? > > The rework to not use the VMA flag is pretty sizeable and is much more > ugly IMO. I know that you are not wild about using bit 30 of 32 for > this, but perhaps we can settle on not exporting it to userspace so we > can reclaim it if we really need it in the future? Yes, that would be definitely more acceptable for me. I do understand that you are not wild about changing mremap behavior. Anyway, I would really prefer if the vma flag was really used only at few places - when we are clearing it along with VM_LOCKED (which could be hidden in VM_LOCKED_CLEAR_MASK or something like that) and when we decide whether the populate or not (this should be __mm_populate). But maybe I am missing some call paths where gup is called unconditionally, I haven't checked that. -- 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>