On Thu, Aug 31, 2017 at 07:19:19PM -0400, Felix Kuehling wrote: > On 2017-08-31 03:00 PM, Jerome Glisse wrote: > > I was not saying you should not use mmu_notifier. For achieving B you need > > mmu_notifier. Note that if you do like ODP/KVM then you do not need to > > pin page. > I would like that. I've thought about it before. The one problem I > couldn't figure out is, where to set the accessed and dirty bits for the > pages. Now we do it when we unpin. If we don't pin the pages in the > first place, we don't have a good place for this. > > Our hardware doesn't give us notifications or accessed/dirty bits, so we > have to assume the worst case that the pages are continuously > accessed/dirty. > > I'd appreciate any advice how to handle that. (Sorry, I realize this is > going a bit off topic.) A pointer to a document or source code would be > great. :) In invalidate_range_start() ie same place as where you unpin but instead of unpining you would just call set_page_dirty() Jérôme
