On Fri, Nov 29, 2024 at 03:48:33PM +0100, David Hildenbrand wrote: > Too long, but as some of these TODOs stand in the memdesc way, fortunately > other people might be able to give a helping hand at some point ;) ;-) > I'll play with using a page type for some of these "simple" cases and see > how hard it will get. I've deliberately made pagetype incompatible with setting a mapcount ... hugetlb being the exception because we only use entire_mapcount. Anyway, I agree we need something better than what we have here. It needs to be simple for a device driver to allocate memory and map it into userspace. I'm willing to allow perf's ringbuffer to be a bit harder than most because it's trying to do the weird thing of writable-first-page-rest-read-only.
