Re: [PATCH 0/3] readfile(2): a new syscall to make open/read/close faster

On Sun, Jul 05, 2020 at 05:18:58AM +0200, Jan Ziak wrote:

On Sun, Jul 5, 2020 at 5:12 AM Matthew Wilcox [off-list ref] wrote:

quoted

You should probably take a look at io_uring.  That has the level of
complexity of this proposal and supports open/read/close along with many
other opcodes.

Then glibc can implement readfile using io_uring and there is no need
for a new single-file readfile syscall.

It could, sure.  But there's also a value in having a simple interface
to accomplish a simple task.  Your proposed API added a very complex
interface to satisfy needs that clearly aren't part of the problem space
that Greg is looking to address.