On Tue, Oct 01, 2013 at 09:48:02AM +0200, Ingo Molnar wrote: > > * Peter Zijlstra <pet...@infradead.org> wrote: > > > On Sat, Sep 28, 2013 at 11:55:26AM -0700, Linus Torvalds wrote: > > > So if the primary reason for this is really just that f*cking anon_vma > > > lock, then I would seriously suggest: > > > > I would still like to see the rwsem patches merged; even if we end up > > going back to a spin style anon_vma lock. > > > > There's been various reports in the past about how programs are > > significantly faster if they wrap their mmap() calls in a pthread_mutex. > > And this was purely down to the fact that rwsem writer-writer contention > > blows chunks. > > That's about the mm->mmap_sem rwsem, right?
Yep. > That impact would have to be measured carefully, and not just for > workloads where we know that better contention logic helps, but other MM > workloads that are hitting hard on mmap_sem. Sure. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
