On 29/04/2020 18:21, Mark Papadakis wrote: > Greetings, > > Are there any plans for an SENDFILE SQE OP? > Using a pipe and 2 two SPLICE ops(using the LINK flag) for moving data from one file FD to a socket FD(for example) works - but it’s somewhat inconvenient and maybe more expensive than it would otherwise be if there was a dedicated op for a sendfile() like facility. > I didn't dig deeply, but it's done by internally creating a pipe and leaving it with a task up until it exits. I hope such pipes use only 1 page or so, but I don't like the idea of having one per each io-wq thread (even lazily as it's done now). If we really want to do that, would probably need something more elaborate. Jens may shed some light. -- Pavel Begunkov
