Based on recent BPF CO-RE, tp_btf, and BPF skeleton changes, re-implement
BCC-based runqslower tool as a portable pre-compiled BPF CO-RE-based tool.
Make sure it's built as part of selftests to ensure it doesn't bit rot.
As part of this patch set, augment `format c` output of `bpftool btf dump`
sub-command with applying `preserve_access_index` attribute to all structs and
unions. This makes all such structs and unions automatically relocatable under
BPF CO-RE, which improves user experience of writing TRACING programs with
direct kernel memory read access.
Also, further clean up selftest/bpf Makefile output and make it conforming to
libbpf and bpftool succinct output format.
v1->v2:
- build in-tree bpftool for runqslower (Yonghong);
- drop `format core` and augment `format c` instead (Alexei);
- move runqslower under tools/bpf (Daniel).
Andrii Nakryiko (6):
tools: sync uapi/linux/if_link.h
libbpf: clean up bpf_helper_defs.h generation output
selftests/bpf: conform selftests/bpf Makefile output to libbpf and
bpftool
bpftool: apply preserve_access_index attribute to all types in BTF
dump
tools/bpf: add runqslower tool to tools/bpf
selftests/bpf: build runqslower from selftests
scripts/bpf_helpers_doc.py | 2 -
tools/bpf/Makefile | 20 ++-
tools/bpf/bpftool/btf.c | 8 ++
tools/bpf/runqslower/.gitignore | 1 +
tools/bpf/runqslower/Makefile | 80 +++++++++++
tools/bpf/runqslower/runqslower.bpf.c | 100 ++++++++++++++
tools/bpf/runqslower/runqslower.c | 187 ++++++++++++++++++++++++++
tools/bpf/runqslower/runqslower.h | 13 ++
tools/include/uapi/linux/if_link.h | 1 +
tools/lib/bpf/Makefile | 2 +-
tools/testing/selftests/bpf/Makefile | 54 ++++----
11 files changed, 437 insertions(+), 31 deletions(-)
create mode 100644 tools/bpf/runqslower/.gitignore
create mode 100644 tools/bpf/runqslower/Makefile
create mode 100644 tools/bpf/runqslower/runqslower.bpf.c
create mode 100644 tools/bpf/runqslower/runqslower.c
create mode 100644 tools/bpf/runqslower/runqslower.h
--
2.17.1
