On Tue, Aug 20, 2019 at 2:32 AM Quentin Monnet <quentin.monnet@xxxxxxxxxxxxx> wrote: > > Hi, > This set adds a new command BPF_BTF_GET_NEXT_ID to the bpf() system call, > adds the relevant API function in libbpf, and uses it in bpftool to list > all BTF objects loaded on the system (and to dump the ids of maps and > programs associated with them, if any). > > The main motivation of listing BTF objects is introspection and debugging > purposes. By getting BPF program and map information, it should already be > possible to list all BTF objects associated to at least one map or one > program. But there may be unattached BTF objects, held by a file descriptor > from a user space process only, and we may want to list them too. > > As a side note, it also turned useful for examining the BTF objects > attached to offloaded programs, which would not show in program information > because the BTF id is not copied when retrieving such info. A fix is in > progress on that side. > > v2: > - Rebase patch with new libbpf function on top of Andrii's changes > regarding libbpf versioning. Applied. Thanks
