netdev - [PATCH v2 bpf-next 0/6] Implement runqslower BCC tool with BPF CO-RE

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Date:   Sun, 12 Jan 2020 23:31:37 -0800
From:   Andrii Nakryiko <andriin@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>
CC:     <andrii.nakryiko@...il.com>, <kernel-team@...com>,
        Andrii Nakryiko <andriin@...com>
Subject: [PATCH v2 bpf-next 0/6] Implement runqslower BCC tool with BPF CO-RE

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