On Tue, Mar 22, 2022 at 08:27:12PM +0100, Miklos Szeredi wrote:

Add a new userspace API that allows getting multiple short values in a
single syscall.

This would be useful for the following reasons:

- Calling open/read/close for many small files is inefficient.  E.g. on my
  desktop invoking lsof(1) results in ~60k open + read + close calls under
  /proc and 90% of those are 128 bytes or less.

As I found out in testing readfile():
	https://lore.kernel.org/r/20200704140250.423345-1-gregkh@linuxfoundation.org (local)

microbenchmarks do show a tiny improvement in doing something like this,
but that's not a real-world application.

Do you have anything real that can use this that shows a speedup?

thanks,

greg k-h