On Thu, Mar 27, 2025 at 07:49:47AM -0700, Alistair Popple wrote: > On Wed, Mar 26, 2025 at 02:14:59AM +0000, Matthew Wilcox wrote: > > So, there's no need to put DEVICE_PRIVATE pages in the page cache. > > Instead the GPU will take a copy of the page(s). We agreed that there > > will have to be some indication (probably a folio flag?) that the GPU has > > or may have a copy of (some of) the folio so that it can be invalidated > > if the page is removed due to truncation / eviction. > > > > Alistair, let me know if that's not what you think we agreed to ;-) > > That all looks about right. I think the flag/indication is a good idea and is > probably the best solution, but I will need to write the code to truely convince > myself of that :-) It might end up making more sense to make it a per-VMA flag or a per-inode flag, but that's probably something you're in a better position to determine than I am.
