[PATCH v3 0/2] Introduce perf-stat -b for BPF programs

Song Liu
2020-12-08T18:18:04Z

This set introduces perf-stat -b option to count events for BPF programs.
This is similar to bpftool-prog-profile. But perf-stat makes it much more
flexible.

Changes v2 => v3:
1. Small fixes in Makefile.perf and bpf_counter.c (Jiri)
2. Rebased on top of bpf-next. This is because 1/2 conflicts with some
patches in bpftool/Makefile.

Changes PATCH v1 => PATCH v2:
1. Various fixes in Makefiles. (Jiri)
2. Fix an build warning/error with gcc-10. (Jiri)

Changes RFC v2 => PATCH v1:
1. Support counting on multiple BPF programs.
2. Add BPF handling to target__validate().
3. Improve Makefile. (Jiri)

Changes RFC v1 => RFC v2:
1. Use bootstrap version of bpftool. (Jiri)
2. Set default to not building bpf skeletons. (Jiri)
3. Remove util/bpf_skel/Makefile, keep all the logic in Makefile.perf.
(Jiri)
4. Remove dependency to vmlinux.h in the two skeletons. The goal here is
to enable building perf without building kernel (vmlinux) first.
Note: I also removed the logic that build vmlinux.h. We can add that
back when we have to use it (to access big kernel structures).

Song Liu (2):
perf: support build BPF skeletons with perf
perf-stat: enable counting events for BPF programs

tools/bpf/bpftool/Makefile | 3 +
tools/build/Makefile.feature | 4 +-
tools/perf/Makefile.config | 9 +
tools/perf/Makefile.perf | 48 ++-
tools/perf/builtin-stat.c | 77 ++++-
tools/perf/util/Build | 1 +
tools/perf/util/bpf_counter.c | 297 ++++++++++++++++++
tools/perf/util/bpf_counter.h | 73 +++++
tools/perf/util/bpf_skel/.gitignore | 3 +
.../util/bpf_skel/bpf_prog_profiler.bpf.c | 93 ++++++
tools/perf/util/evsel.c | 11 +
tools/perf/util/evsel.h | 6 +
tools/perf/util/stat-display.c | 4 +-
tools/perf/util/target.c | 34 +-
tools/perf/util/target.h | 10 +
tools/scripts/Makefile.include | 1 +
16 files changed, 655 insertions(+), 19 deletions(-)
create mode 100644 tools/perf/util/bpf_counter.c
create mode 100644 tools/perf/util/bpf_counter.h
create mode 100644 tools/perf/util/bpf_skel/.gitignore
create mode 100644 tools/perf/util/bpf_skel/bpf_prog_profiler.bpf.c

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2.24.1