[$] A proposal for shared memory in BPF programs

Alexei Starovoitov introduceda patch series for the Linux kernel on February 6 to add bpf_arena, a new typeof shared memory betweenBPFprograms and user space.Starovoitov expects arenas to be useful both for bidirectional communicationbetween user space and BPF programs, and for use as an additional heap for BPFprograms. This will likely be useful to BPF programs that implementcomplex data structures directly, instead of relying on the kernel to supply them.Starovoitov cited Google'sghOSt projectas an example and inspiration for the work.