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 would like comments on some key design choices:
1. We are using BPF skeletons here, which is by far the easiest way to
write and ship BPF programs. However, this requires bpftool, which
makes building perf slower.
2. A Makefile is added to tools/perf/util/bpf_skel/ to build bpftool,
and BPF skeletons. This keeps main perf Makefiles simple. But we may
not like it for some reason?
Some known limitations (or work to be done):
1. Only counting events for one BPF program at a time.
2. Need extra logic in target__validate().
Song Liu (2):
perf: support build BPF skeletons with perf
perf-stat: enable counting events for BPF programs
tools/build/Makefile.feature | 3 +-
tools/perf/Makefile.config | 8 +
tools/perf/Makefile.perf | 15 +-
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 +
tools/perf/util/bpf_skel/Makefile | 71 ++++++
.../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 +
14 files changed, 571 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/Makefile
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
