Hello, On (06/03/16 15:49), Michal Hocko wrote: > __khugepaged_exit is called during the final __mmput and it employs a > complex synchronization dances to make sure it doesn't race with the > khugepaged which might be scanning this mm at the same time. This is > all caused by the fact that khugepaged doesn't pin mm_users. Things > would simplify considerably if we simply check the mm at > khugepaged_scan_mm_slot and if mm_users was already 0 then we know it > is dead and we can unhash the mm_slot and move on to another one. This > will also guarantee that __khugepaged_exit cannot race with khugepaged > and so we can free up the slot if it is still hashed. > > Signed-off-by: Michal Hocko <mhocko@xxxxxxxx> with this patch and http://ozlabs.org/~akpm/mmotm/broken-out/mm-thp-make-swapin-readahead-under-down_read-of-mmap_sem-fix-2.patch I saw no problems during my tests (well, may be didn't test hard enough). -ss -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
