netdev - [PATCH bpf-next 0/3] Implement runqslower BCC tool with BPF CO-RE

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Date:   Wed, 18 Dec 2019 23:06:55 -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 bpf-next 0/3] Implement runqslower BCC tool with BPF CO-RE

Based on recent BPF CO-RE, tp_btf, and skeleton changes, re-implement
BCC-based runqslower tool as 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, also introduce new `format core` to `bpftool btf
dump` sub-command. It generates same compilable C header file with all the
types from BTF, but additionally ensures seamless use of generated header with
BPF CO-RE. Currently `format core` applies preserve_access_index attribute (if
supported by Clang) to all structs and unions, to improve user experience of
writing TRACING programs with direct kernel memory read access.

Andrii Nakryiko (3):
  bpftool: add extra CO-RE mode to btf dump command
  libbpf/tools: add runqslower tool to libbpf
  selftests/bpf: build runqslower from selftests

 .../bpf/bpftool/Documentation/bpftool-btf.rst |   7 +-
 tools/bpf/bpftool/bash-completion/bpftool     |   2 +-
 tools/bpf/bpftool/btf.c                       |  24 ++-
 tools/lib/bpf/tools/runqslower/.gitignore     |   2 +
 tools/lib/bpf/tools/runqslower/Makefile       |  60 ++++++
 .../lib/bpf/tools/runqslower/runqslower.bpf.c | 101 ++++++++++
 tools/lib/bpf/tools/runqslower/runqslower.c   | 187 ++++++++++++++++++
 tools/lib/bpf/tools/runqslower/runqslower.h   |  13 ++
 tools/testing/selftests/bpf/Makefile          |   7 +-
 9 files changed, 395 insertions(+), 8 deletions(-)
 create mode 100644 tools/lib/bpf/tools/runqslower/.gitignore
 create mode 100644 tools/lib/bpf/tools/runqslower/Makefile
 create mode 100644 tools/lib/bpf/tools/runqslower/runqslower.bpf.c
 create mode 100644 tools/lib/bpf/tools/runqslower/runqslower.c
 create mode 100644 tools/lib/bpf/tools/runqslower/runqslower.h

-- 
2.17.1