On Fri 27-05-16 08:45:10, Michal Hocko wrote: [...] > It is still an operation which is not needed for 99% of situations. So > if we do not need it for correctness then I do not think this is worth > bothering. Since you have pointed out exit_mm vs. __exit_signal race yesterday I was thinking how to make the check reliable. Even atomic_read(mm->mm_users) > get_nr_threads() is not reliable and we can miss other tasks just because the current thread group is mostly past exit_mm. So far I couldn't find a way to tweak this around though. I will think about it more but I am afraid that a flag would be really needed afterall. -- 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>