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 /DxgxKVe 27cKHzEPRHp7k5mHsdDzwdbBXSbMYSmw+UEeizvxtpgrdQGSh62ruYwiAiE+09XY4kNV4fT+jJmEAt499LHhOTzIUXsFm9r3Vsd9q5h6CoT0KIloxdA5ux9ty+nHBq3Iwvv5yG4sbKkDAMYbs7JWRJBph8AXgS/f2J/QiuPYsZ3Z2kJqOfx/UdA31FSR79sh1pekM6ixiKQr8IBrWd+cbXFrnndZb3+W/uptGxJhtgPAroQRantGeAsw4g6DcL5lRh/dbsnocpX3/XhsdNvw4ZJ1mnQkPru9WE3WyrdZm9QGcRbG0GMFeF4+jYThkBe4/vn8fN4Oxt79uNqlCrMaVmf6mL/d6WWvRTcfoXdyaUUy0WOe2wTPBMC2j7SWc/Qv9btWwzdipLpvRXNaK21lQyZbbBcu6WQY7bDwzDvoKQDOyOj5+u2f0RYt+7lpON0rabNQ3KwXWIS0m9DX+vygy5jMzPCj6M3XwuMFZFLGxrfxB/Pqb16f0e9XmAKKfthW/7HTi62LRyafyXN8O4+7kHN0r54s7jOsKRnvvv4/yN5nQvrn3Vnldz/YODUQEefSvCZYw0FAS0fji0qlylIkXjADu1C+Fc5zIx8YsJ9ADHo5paGCgZASwUvzFc6vEGMCd2UrS2ufJslUUZfaNebUSWqzZUkYkLIxzhqTtQAhc1K9UpJhQ/abSz1uGbA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Jul 01, 2025 at 09:30:51AM +0100, Ryan Roberts wrote: > >> In an ideal world we would flatten and just have mprotect_folio_pte_batch() > >> return the batch size considering all the relevant PTE bits AND the > >> AnonExclusive bit on the pages. IIRC one of Dev's earlier versions modified the > >> core folio_pte_batch() function to also look at the AnonExclusive bit, but I > >> really disliked changing that core function (I think others did too?). > > > > Yeah let's not change the core function. > > > > My suggestion is to have mprotect_folio_pte_batch() do this. > > > >> > >> So barring that approach, we are really only left with the batch and sub-batch > >> approach - although, yes, it could be abstracted more. We could maintain a > >> context struct that persists across all calls to mprotect_folio_pte_batch() and > >> it can use that to keep it's state to remember if we are in the middle of a > >> sub-batch and decide either to call folio_pte_batch() to get a new batch, or > >> call anon_exclusive_batch() to get the next sub-batch within the current batch. > >> But that started to feel overly abstracted to me. > > > > Having this nested batch/sub-batch loop really feels worse. You just get lost in > > the complexity here very easily. > > > > But i"m also not sure we need to maintain _that_ much state? > > > > We're already looping over all of the PTEs here, so abstracting _the entire > > loop_ and all the sub-batch stuff to another function, that is > > mprotect_folio_pte_batch() I think sensibly, so it handles this for you makes a > > ton of sense. > > So effectively turn mprotect_folio_pte_batch() into an iterator; have a struct > and a funtion to init the struct for the the number of ptes we want to iterate > over, then a per iteration function that progressively returns batches? Is that really necessary though? Idea is that mprotect_folio_pte_batch() returns the nr_ptes _taking into account the PAE stuff_. Would this break anything? We might need to pass a flag to say 'don't account for this' for prot numa case. > > Then we just have a simple loop here that gets the next batch and processes it?