On Tue, 2013-09-24 at 15:22 -0700, Tim Chen wrote: > We have incorporated various suggestions from Ingo for version 5 of this patchset > and will like to have it merged if there are no objections. > > In this patchset, we introduce two categories of optimizations to read > write semaphore. The first four patches from Alex Shi reduce cache bouncing of the > sem->count field by doing a pre-read of the sem->count and avoid cmpxchg > if possible. > > The last two patches introduce similar optimistic spinning logic as > the mutex code for the writer lock acquisition of rwsem. Right. We address the general 'mutexes out perform writer-rwsems' situations that has been seen in more than one case. Users now need not worry about performance issues when choosing between these two locking mechanisms. Thanks, Davidlohr -- 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>