On Wed, Jan 09, 2019 at 06:03:04PM +0200, Gal Pressman wrote: > On 09-Jan-19 17:36, Jason Gunthorpe wrote:>> We can also just fail mmaps for > pages that are still used by a different > >> ucontext instead of deferring the PD deallocation. > > > > How do you know if they are still used? > > Store all mapped BAR pages per device, every mmap to a page that still exists in > our database will fail (unless it's from the same ucontext). > Dealloc ucontext will remove all pages associated to the ucontext so other users > could mmap it. Seems reasonable, but the tracking seems a bit complicated as you need a refcount for every bar page. Jason
