[$] Binary portability for BPF programs

The BPF virtual machine is the same on all architectures where it issupported; architecture-specific code takes care of translating BPF tosomething the local processor can understand. So one might be tempted tothink that BPF programs would be portable across architectures but, in manycases, that turns out not to be true. During the BPF microconference at theLinux PlumbersConference, Alexei Starovoitov (assisted by Yonghong Song, who has donemuch of the work described) explainedthe problem and the work that has been done toward "compile once, run everywhere" BPF.