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io_uring registered buffers

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Christian Schwarz
2024-07-09 08:23:57 +00:00
parent 730a66a77c
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docs/rfcs/034-direct-io-for-pageserver.md
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@@ -237,6 +237,12 @@ If we **have** to do writes of non-block-size-multiple length, the solution is t
We don't have infrastructure for this yet.
It would be best to avoid this, and from my scoping work in January, I cannot remember a need for it.
In the future, we might want to use [io_uring registered buffers](https://unixism.net/loti/ref-iouring/io_uring_register.html).
It's out of reach at this time because we use tokio-epoll-uring in thread-local executor mode, meaning we'd have to register
each buffer with all thread-local executors. However, above API requirements for the buffer pool implicitly require the buffer
handle that's returned by `get()` to be a custom smart pointer type. We will be able to extend it in the future to include the
io_uring registered buffer index without having to touch the entire code base.
## Execution
### Phase 1