Proper TCP socket splicing reduces the load on userspace processes and enables more efficient data forwarding. We realized that Linux Kernel's SOCKMAP infrastructure can be reused for this purpose.

Slightly over a year ago, LWN reported on a
couple of different kernel patches aimed at providing fast, or at least
faster, interprocess communication (IPC): Cross Memory Attach (CMA) and
kernel-dbus (kdbus).  In one of the related email threads on
the linux-kernel list, a third (pre-existing) kernel patch called KNEM was discussed.
Meanwhile, yet another kernel module - "binder" used by the Android
platform - is in use in millions of devices worldwide to provide fast IPC,
and Linus recently observed that code that
actually is used is the code that is actually worth something so maybe
more of the Android code should be merged despite objections from some
corners.  Binder wasn't explicitly mentioned in that discussion but could
reasonably be assumed to be included.