On 20/04/2017 15:33, Matthew Wilcox wrote: > On Wed, Apr 19, 2017 at 02:18:23PM +0200, Laurent Dufour wrote: >> Following the series pushed by Davidlohr Bueso based on the Jan Kara's >> work [1] which introduces range locks, this series implements the >> first step of the attempt to replace the mmap_sem by a range lock. > > Have you previously documented attempts to replace the mmap_sem by an > existing lock type before introducing a new (and frankly weird) lock?
No :/ > My initial question is "Why not use RCU for this?" -- the rxrpc code > uses an rbtree protected by RCU. I'm also working on forward-porting work done by Peter Zijlstra : https://marc.info/?l=linux-mm&m=141384492326748 I'll send a series on top 4.10 soon.
