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 Mj317P2u 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 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, Aug 19, 2025 at 01:33:40PM +0200, Thomas Hellström wrote: > On Tue, 2025-08-19 at 19:55 +1000, Alistair Popple wrote: > > On Mon, Aug 18, 2025 at 01:46:55PM -0300, Jason Gunthorpe wrote: > > > On Mon, Aug 18, 2025 at 09:44:01AM -0700, Matthew Brost wrote: > > > > On Mon, Aug 18, 2025 at 01:36:17PM -0300, Jason Gunthorpe wrote: > > > > > On Mon, Aug 18, 2025 at 09:25:20AM -0700, Matthew Brost wrote: > > > > > > I think this choice makes sense: it allows embedding the wait > > > > > > state from > > > > > > the initial notifier call into the pass structure. Patch [6] > > > > > > shows this > > > > > > by attaching the issued TLB invalidation fences to the pass. > > > > > > Since a > > > > > > single notifier may be invoked multiple times with different > > > > > > ranges but > > > > > > the same seqno, > > > > > > > > > > That should be explained, but also seems to be a bit of a > > > > > different > > > > > issue.. > > > > > > > > > > If the design is really to only have two passes and this linked > > > > > list > > > > > is about retaining state then there should not be so much > > > > > freedom to > > > > > have more passes. > > > > > > > > I’ll let Thomas weigh in on whether we really need more than two > > > > passes; > > > > my feeling is that two passes are likely sufficient. It’s also > > > > worth > > > > noting that the linked list has an added benefit: the notifier > > > > tree only > > > > needs to be walked once (a small time-complexity win). > > > > > > You may end up keeping the linked list just with no way to add a > > > third > > > pass. > > > > It seems to me though that linked list still adds unnecessary > > complexity. I > > think this would all be much easier to follow if we just added two > > new callbacks > > - invalidate_start() and invalidate_end() say. > > One thing that the linked list avoids, though, is traversing the > interval tree two times. It has O(n*log(n)) whereas the linked list > overhead is just O(n_2pass). > > > > > Admitedly that would still require the linked list (or something > > similar) to > > retain the ability to hold/pass a context between the start and end > > callbacks. > > Which is bit annoying, it's a pity we need to allocate memory in a > > performance > > sensitive path to effectively pass (at least in this case) a single > > pointer. I > > can't think of any obvious solutions to that though. > > One idea is for any two-pass notifier implementation to use a small > pool. That would also to some extent mitigate the risk of out-of-memory > with GFP_NOWAIT. > I think we can attach a preallocated list entry to the driver-side notifier state; then you’d only need to allocate (or block) if that notifier is invoked more than once while a wait action (e.g., a TLB invalidation) is outstanding. Multiple invocations are technically possible, but in practice I’d expect them to be rare. I’m not sure how much of a win this is, though. On Intel hardware, TLB invalidations are several orders of magnitude slower than the software steps our notifiers perform. Ultimately, whether to allocate or preallocate is a driver-side choice. Matt > /Thomas > > > > > > > Jason > > > >