On Sat, 2007-05-12 at 11:27 +0200, Esben Nielsen wrote: > > On Fri, 11 May 2007, Peter Zijlstra wrote: > > > > > I was toying with a scalable rw_mutex and found that it gives ~10% > > reduction in > > system time on ebizzy runs (without the MADV_FREE patch). > > > > You break priority enheritance on user space futexes! :-( > The problems is that the futex waiter have to take the mmap_sem. And as > your rw_mutex isn't PI enabled you get priority inversions :-(
Do note that rwsems have no PI either. PI is not a concern for mainline - yet, I do have ideas here though. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
