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[RFC,bpf-next,0/4] bpftool: introduce prog profile

Message ID 20200213210115.1455809-1-songliubraving@fb.com
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Series bpftool: introduce prog profile | expand

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Song Liu Feb. 13, 2020, 9:01 p.m. UTC 
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.

Sending as RFC because 2/4 will be replaced by Eelco Chaudron's work for
bpf_program__set_attach_target().

Please share your comments.

Thanks,
Song

Song Liu (4):
  bpf: allow bpf_perf_event_read_value in all BPF programs
  libbpf: introduce bpf_program__overwrite_section_name()
  bpftool: introduce "prog profile" command
  bpftool: Documentation for bpftool prog profile

 kernel/trace/bpf_trace.c                      |   4 +-
 .../bpftool/Documentation/bpftool-prog.rst    |  17 +
 tools/bpf/bpftool/profiler.skel.h             | 820 ++++++++++++++++++
 tools/bpf/bpftool/prog.c                      | 387 ++++++++-
 tools/bpf/bpftool/skeleton/README             |   3 +
 tools/bpf/bpftool/skeleton/profiler.bpf.c     | 185 ++++
 tools/bpf/bpftool/skeleton/profiler.h         |  47 +
 tools/lib/bpf/libbpf.c                        |  13 +-
 tools/lib/bpf/libbpf.h                        |   4 +
 tools/lib/bpf/libbpf.map                      |   5 +
 10 files changed, 1481 insertions(+), 4 deletions(-)
 create mode 100644 tools/bpf/bpftool/profiler.skel.h
 create mode 100644 tools/bpf/bpftool/skeleton/README
 create mode 100644 tools/bpf/bpftool/skeleton/profiler.bpf.c
 create mode 100644 tools/bpf/bpftool/skeleton/profiler.h

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