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KILL_LEVEL=7.0 tests=BSF_BESS_OUTBOUND X-BESS-BRTS-Status:1 On 10/24/25 00:27, Joanne Koong wrote: > On Wed, Oct 22, 2025 at 1:43 PM Bernd Schubert wrote: >> >> On 10/22/25 22:20, Joanne Koong wrote: >>> This adds support for daemons who preregister buffers to minimize the overhead >>> of pinning/unpinning user pages and translating virtual addresses. Registered >>> buffers pay the cost once during registration then reuse the pre-pinned pages, >>> which helps reduce the per-op overhead. >>> >>> This is on top of commit 211ddde0823f in the iouring tree. >> >> Interesting, on a first glance this looks like an alternative >> implementation of page pinning >> >> https://lore.kernel.org/all/20240901-b4-fuse-uring-rfcv3-without-mmap-v3-17-9207f7391444@ddn.com/ >> >> At DDN we are running with that patch (changed commit message) and another >> one that avoids io_uring_cmd_complete_in_task() - with pinned pages >> the IO submitting application can directly write into header and payload >> (note that the latter also required pinned headers) >> >> Going to look into your approach tomorrow. > > Thanks for taking a look when you get the chance. The libfuse changes > are in this branch > https://github.com/joannekoong/libfuse/tree/registered_buffers btw. Sorry, still didn't manage another task for tomorrow. Btw, the reason hadn't sent my patches is that I hadn't handled memory accounting yet. And then got busy with other tasks for much too long... I see in io_sqe_buffers_register() how that is done, although I'm confused why it first calls io_pin_pages() and only then accounts. I.e. it can temporarily go above the limit - I wonder what happens if the user opens another application that time that just needs a little locked memory... In general I think your solution more complex than mine - I think I'm going to update my patches (there are conflicts due to folio conversion) and then we can compare. Thanks, Bernd