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 v5 => v6:
1. Use new header bpf_tracing.h (Yonghong).
Changes v4 => v5:
1. Adjust perf_event_attr for the events (Jiri).
Changes v3 => v4:
1. Simplify err handling in profile_open_perf_events() (Quentin);
2. Remove redundant p_err() (Quentin);
3. Replace tab with space in bash-completion; (Quentin);
4. Fix typo _bpftool_get_map_names => _bpftool_get_prog_names (Quentin).
Changes v2 => v3:
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 (4):
bpftool: introduce "prog profile" command
bpftool: Documentation for bpftool prog profile
ybpftool: bash completion for "bpftool prog profile"
bpftool: fix typo in bash-completion
.../bpftool/Documentation/bpftool-prog.rst | 19 +
tools/bpf/bpftool/Makefile | 18 +
tools/bpf/bpftool/bash-completion/bpftool | 47 +-
tools/bpf/bpftool/prog.c | 424 +++++++++++++++++-
tools/bpf/bpftool/skeleton/profiler.bpf.c | 119 +++++
tools/bpf/bpftool/skeleton/profiler.h | 47 ++
tools/scripts/Makefile.include | 1 +
7 files changed, 672 insertions(+), 3 deletions(-)
create mode 100644 tools/bpf/bpftool/skeleton/profiler.bpf.c
create mode 100644 tools/bpf/bpftool/skeleton/profiler.h
--
2.17.1
