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Subject[RFC v2 0/2] Introduce perf-stat -b for BPF programs
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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.

Sending as RFC because I haven't addressed some known limitations:
1. Only counting events for one BPF program at a time.
2. Need extra logic in target__validate().

Changes RFCv1 => RFCv2:
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 | 2 +
tools/build/Makefile.feature | 3 +-
tools/perf/Makefile.config | 9 +
tools/perf/Makefile.perf | 52 ++++-
tools/perf/builtin-stat.c | 59 ++++-
tools/perf/util/Build | 1 +
tools/perf/util/bpf_counter.c | 215 ++++++++++++++++++
tools/perf/util/bpf_counter.h | 71 ++++++
tools/perf/util/bpf_skel/.gitignore | 3 +
.../util/bpf_skel/bpf_prog_profiler.bpf.c | 96 ++++++++
tools/perf/util/bpf_skel/dummy.bpf.c | 19 ++
tools/perf/util/evsel.c | 10 +
tools/perf/util/evsel.h | 5 +
tools/perf/util/target.h | 6 +
tools/scripts/Makefile.include | 1 +
15 files changed, 541 insertions(+), 11 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
create mode 100644 tools/perf/util/bpf_skel/dummy.bpf.c

--
2.24.1

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