[$] A proposal for shared memory in BPF programs

Alexei Starovoitov introduced

a patch series for the Linux kernel on February 6 to add bpf_arena, a new type
of shared memory between
BPF
programs and user space.
Starovoitov expects arenas to be useful both for bidirectional communication
between user space and BPF programs, and for use as an additional heap for BPF
programs. This will likely be useful to BPF programs that implement
complex data structures directly, instead of relying on the kernel to supply them.
Starovoitov cited Google's
ghOSt project
as an example and inspiration for the work.