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linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev References: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-0-4583d8a23bca@kernel.org> <20260917-b4-mmap-prepare-vma-flag-sanify-v3-31-4583d8a23bca@kernel.org> <9bbdf4e8-6984-4477-a183-f0b236047381@kernel.org> <3557015d-23dd-41ef-9832-78b58587f3f4@kernel.org> <81e1e5ae-0aab-4584-81e6-3fc9c2634d07@kernel.org> <2e5a4e6c-8f9c-4050-8998-454b83f4823b@kernel.org> <3387642b-c39f-4f19-ba0c-267bbd2fe91d@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 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W2+mz70oGAba0x7Ap1gKqZmEd2T8fftdQVhkAi9g3eM5KHWdExNDrriqm1oTeg38Ih+CxrffP3d+wvoIdN3E2BhAkGsXohgitWuvXVJitPTZOJZ9IC8+1uqOvoMr85IY6pIzFZytgfVjEpVXV3s2Ra7j/h878vmRJmOuWOC5RASP10lOqOXPiGskmsv/LuBwtKg0UR1V2OsjQBmPdubxR4i7r9yGdSv02CvO+uAxq0MZcrrI0myCZ9SqGRJ4Ih4WCG5JI0D+jm5raJk/O6NfewNn45i+Vpd40HDI8W6xfRtDnxKLf4ZDR9OZ1CPlTb9Kl1+GUNXlcpNbyO0vC38oEneIe2wukfR+U= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/2/26 15:59, Lorenzo Stoakes (ARM) wrote: > On Fri, Oct 02, 2026 at 03:11:27PM +0200, David Hildenbrand (Arm) wrote: >> I'd be very happy if we could find a clear way to describe "this is what we call >> user memory: anon+pagecache", if that could come handy in such a context. > > Rather than arguing about it, how about shifting things to 'what backs the > mapping' and something like: > > /* big long kdoc... */ > static inline bool vma_flags_is_mm_backed(const vma_flags_t *flags) > { > /* hugetlb is a fixed mapping, but the mm owns it entirely. */ > if (vma_flags_is_hugetlb(flags)) > return true; > > /* > * Kernel-owned mappings are populated by their owner, and fixed mappings > * have a layout the mm cannot assume ordinary fault semantics over. > */ > if (vma_flags_is_kernel_owned(flags) || > vma_flags_is_fixed_mapping(flags)) > return false; > > /* The mm has promised it may discard droppable memory at any time. */ > return !vma_flags_test_single_mask(flags, VMA_DROPPABLE); > } In my other mail I was wondering whether we could use vma_is_mm_managed() to express !vma_is_kernel_owned(). Maybe vma_is_mm_backed() could fit into that picture. Reading above I am still confused why something that expresses "backed" talks about "fixed mappings and ownership", sorry :( It's late here, and this is a hard nut to crack. What we have here is: 1) Is this an ordinary MM-managed VMA. So far so good, I understand that. (with a twist what I just learned about things that map random allocated pages through -> fault, but so far so good) 2) Is this MM "fixed" that makes expand/merge tricky, except if it's hugetlb where we can still handle it. I think VM_DONTEXPAND is also rather misnamed :( I assume it really means, using sel_mmap_policy_ops() as an example: the MM manages the things that are getting mapped in here (->fault), but the pages are not really pagecache/anon, but some other shit. So we cannot expand the mapping. Gah, so complicated. 3) Can the MM drop the pages at any time. I still think that 3) does not quite fit into that picture. Using something like "vma_is_mm_backed" to say "this is mm-managed, but all things in there come from core-mm and not some other random shit people punch into ->fault" would work for me. (not sure if there is still some other way how someone could get random pages into a VMA ... or how to catch someone not setting the DONTEXPAND flag) God, this is all such a confusing mess with so many ways of getting stuff messed up by other parts of the system. Thanks for working on cleaning that up. -- Cheers, David