On Tue, 2013-08-06 at 16:55 -0700, Davidlohr Bueso wrote: > I got good numbers, recovering the performance drop I noticed with the > i_mmap_mutex to rwsem patches. That's good. I remembered that the earlier version of the patch not only recovered the performance drop, but also provide some boost when you switch from i_mmap_mutex to rwsem for aim7. Do you see similar boost with this version? > Looking forward to a more upstreamable > patchset that deals with this work, including the previous patches. > > One thing that's bugging me about this series though is the huge amount > of duplicated code being introduced to rwsems from mutexes. We can share > common functionality such as mcs locking (perhaps in a new file under > lib/), can_spin_on_owner() and owner_running(), perhaps moving those > functions into sheduler code, were AFAIK they were originally. I think that MCS locking is worth breaking out as its own library. After we've done that, the rest of the duplication are minimal. It is easier to keep them separate as there are some rwsem specific logic that may require tweaking to can_spin_on_owner and owner_running. Thanks. Tim -- 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>