On Tue, May 26, 2020 at 7:09 PM Daniel Xu <dxu@xxxxxxxxx> wrote: > > Right now the libbpf model encourages loading the entire object at once. > In this model, libbpf handles loading BTF from vmlinux for us. However, > it can be useful to selectively load certain maps and programs inside an > object without loading everything else. There is no way to selectively load or not load a map. All maps are created, unless they are reusing map FD or pinned instances. See below, I'd like to understand the use case better. > > In the latter model, there was perviously no way to load BTF on-demand. > This commit exports the bpf_object__load_vmlinux_btf such that we are > able to load BTF on demand. > Let's start with the real problem, not a solution. Do you have specific use case where you need bpf_object__load_vmlinux_btf()? It might not do anything if none of BPF programs in the object requires BTF, because it's very much tightly coupled with loading bpf_object as a whole model. I'd like to understand what you are after with this, before exposing internal implementation details as an API. > Signed-off-by: Daniel Xu <dxu@xxxxxxxxx> > --- > tools/lib/bpf/libbpf.c | 2 +- > tools/lib/bpf/libbpf.h | 1 + > tools/lib/bpf/libbpf.map | 1 + > 3 files changed, 3 insertions(+), 1 deletion(-) > [...]
