On Thu, Apr 13, 2017 at 09:37:10AM -0700, Paul E. McKenney wrote: > On Thu, Apr 13, 2017 at 11:50:29AM +0200, Peter Zijlstra wrote: > > On Wed, Apr 12, 2017 at 10:40:25AM -0700, Paul E. McKenney wrote: > > > Peter Zijlstra proposed using SRCU to reduce mmap_sem contention [1], > > > > Bugger, now you're making me feel bad for not having updated those > > patches in ages.. I'll try and bump it on the todo list. > > Apologies, I wasn't trying to make you feel bad. But I did get an old > version of the patch. A much more recent one is here, which I have > added to the commit log: > > https://patchwork.kernel.org/patch/5108281/ > > For my part, I feel bad that I didn't realize much earlier that parallel > SRCU callbacks were needed. As it was, someone had to tell me late > last year.
And it turns out that Laurent Dufour (CCed) forward-ported your patch from the above patchworks URL to 4.11. He is chasing down some mmseq bugs on a best-effort basis. Thanx, Paul > But yes, it would be really cool to have lockless VMA lookup!!! > > Thanx, Paul