On Sat 04-06-16 16:51:14, Sergey Senozhatsky wrote: > 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 <mho...@suse.com> > > 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).
Thanks for the testing! -- Michal Hocko SUSE Labs
