netdev - [PATCH v2 bpf-next 0/2] bpftool: introduce prog profile

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Date:   Fri, 28 Feb 2020 15:40:56 -0800
From:   Song Liu <songliubraving@...com>
To:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>
CC:     <kernel-team@...com>, <ast@...nel.org>, <daniel@...earbox.net>,
        <arnaldo.melo@...il.com>, <jolsa@...nel.org>,
        Song Liu <songliubraving@...com>
Subject: [PATCH v2 bpf-next 0/2] bpftool: introduce prog profile

This set introduces bpftool prog profile command, which uses hardware
counters to profile BPF programs.

This command attaches fentry/fexit programs to a target program. These two
programs read hardware counters before and after the target program and
calculate the difference.

Changes RFC => v2:
1. Use new bpf_program__set_attach_target() API;
2. Update output format to be perf-stat like (Alexei);
3. Incorporate skeleton generation into Makefile;
4. Make DURATION optional and Allow Ctrl-C (Alexei);
5. Add calcated values "insn per cycle" and "LLC misses per million isns".

Song Liu (2):
  bpftool: introduce "prog profile" command
  bpftool: Documentation for bpftool prog profile

 .../bpftool/Documentation/bpftool-prog.rst    |  17 +
 tools/bpf/bpftool/Makefile                    |  18 +
 tools/bpf/bpftool/prog.c                      | 428 +++++++++++++++++-
 tools/bpf/bpftool/skeleton/profiler.bpf.c     | 171 +++++++
 tools/bpf/bpftool/skeleton/profiler.h         |  47 ++
 tools/scripts/Makefile.include                |   1 +
 6 files changed, 681 insertions(+), 1 deletion(-)
 create mode 100644 tools/bpf/bpftool/skeleton/profiler.bpf.c
 create mode 100644 tools/bpf/bpftool/skeleton/profiler.h

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2.17.1