copy on write for splice() from file to pipe?

Linus Torvalds torvalds at
Fri Feb 10 20:44:56 UTC 2023

On Fri, Feb 10, 2023 at 12:39 PM Jens Axboe <axboe at> wrote:
> Right, I'm referencing doing zerocopy data sends with io_uring, using
> IORING_OP_SEND_ZC. This isn't from a file, it's from a memory location,
> but the important bit here is the split notifications and how you
> could wire up a OP_SENDFILE similarly to what Andy described.

Sure, I think it's much more reasonable with io_uring than with splice itself.

So I was mainly just reacting to the "strict-splice" thing where Andy
was talking about tracking the page refcounts. I don't think anything
like that can be done at a splice() level, but higher levels that
actually know about the whole IO might be able to do something like

Maybe we're just talking past each other.


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