Hi Nai, On Sat, Oct 22, 2011 at 01:07:11PM +0800, Nai Xia wrote: > Yeah, anon_vma root lock is a big lock. And JFYI, actually I am doing > some very nasty hacking on anon_vma and one of the side effects is > breaking the root lock into pieces. But this area is pretty > convolved by many racing conditions. I hope some day I will finally make > my patch work and have your precious review of it. :-) :) It's going to be not trivial, initially it was not a shared lock but it wasn't safe that way (especially with migrate required a reliable rmap_walk) and using a shared lock across all same_anon_vma/same_vma lists was the only way to be safe and solve the races. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>