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.
1. Change order of arguments (Quentin), as:
bpftool prog profile PROG [duration DURATION] METRICs
2. Add bash-completion for bpftool prog profile (Quentin);
3. Fix build of selftests (Yonghong);
4. Better handling of bpf_map_lookup_elem() returns (Yonghong);
5. Improve clean up logic of do_profile() (Yonghong);
6. Other smaller fixes/cleanups.
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 (3):
bpftool: introduce "prog profile" command
bpftool: Documentation for bpftool prog profile
bpftool: bash completion for "bpftool prog profile"
.../bpftool/Documentation/bpftool-prog.rst | 19 +
tools/bpf/bpftool/Makefile | 18 +
tools/bpf/bpftool/bash-completion/bpftool | 45 +-
tools/bpf/bpftool/prog.c | 432 +++++++++++++++++-
tools/bpf/bpftool/skeleton/profiler.bpf.c | 171 +++++++
tools/bpf/bpftool/skeleton/profiler.h | 47 ++
tools/scripts/Makefile.include | 1 +
7 files changed, 731 insertions(+), 2 deletions(-)
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
