On Fri, 15 Apr 2016 12:14:31 +0100 Chris Wilson <ch...@chris-wilson.co.uk> wrote:
> > > purge_fragmented_blocks() manages per-cpu lists, so that looks safe > > > under its own rcu_read_lock. > > > > > > Yes, it looks feasible to remove the purge_lock if we can relax sync. > > > > what is still left is waiting on vmap_area_lock for !sync mode. > > but probably is not that bad. > > Ok, that's bit beyond my comfort zone with a patch to change the free > list handling. I'll chicken out for the time being, atm I am more > concerned that i915.ko may call set_page_wb() frequently on individual > pages. Nick Piggin's vmap rewrite. 20x (or more) faster. https://lwn.net/Articles/285341/ 10 years ago, never finished.
