[PATCH v2 bpf-next 0/3] Add benchmark runner and few benchmarks

[Andrii Nakryiko <andriin@fb.com>]

Add generic benchmark runner framework which simplifies writing various
performance benchmarks in a consistent fashion.  This framework will be used
in follow up patches to test performance of perf buffer and ring buffer as
well.

Patch #1 adds generic runner implementation and atomic counter benchmarks to
validate benchmark runner's behavior.

Patch #2 implements test_overhead benchmark as part of bench runner. It also
add fmod_ret BPF program type to a set of benchmarks.

Patch #3 tests faster alternatives to set_task_comm() approach, tested in
test_overhead, in search for minimal-overhead way to trigger BPF program
execution from user-space on demand.

v1->v2:
  - moved benchmarks into benchs/ subdir (John);
  - added benchmark "suite" scripts (John);
  - few small clean ups, change defaults, etc.

Andrii Nakryiko (3):
  selftests/bpf: add benchmark runner infrastructure
  selftest/bpf: fmod_ret prog and implement test_overhead as part of
    bench
  selftest/bpf: add BPF triggering benchmark

 tools/testing/selftests/bpf/.gitignore        |   1 +
 tools/testing/selftests/bpf/Makefile          |  17 +-
 tools/testing/selftests/bpf/bench.c           | 398 ++++++++++++++++++
 tools/testing/selftests/bpf/bench.h           |  74 ++++
 .../selftests/bpf/benchs/bench_count.c        |  91 ++++
 .../selftests/bpf/benchs/bench_rename.c       | 195 +++++++++
 .../selftests/bpf/benchs/bench_trigger.c      | 167 ++++++++
 .../selftests/bpf/benchs/run_bench_rename.sh  |   9 +
 .../selftests/bpf/benchs/run_bench_trigger.sh |   9 +
 .../selftests/bpf/prog_tests/test_overhead.c  |  14 +-
 .../selftests/bpf/progs/test_overhead.c       |   6 +
 .../selftests/bpf/progs/trigger_bench.c       |  47 +++
 12 files changed, 1026 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/bench.c
 create mode 100644 tools/testing/selftests/bpf/bench.h
 create mode 100644 tools/testing/selftests/bpf/benchs/bench_count.c
 create mode 100644 tools/testing/selftests/bpf/benchs/bench_rename.c
 create mode 100644 tools/testing/selftests/bpf/benchs/bench_trigger.c
 create mode 100755 tools/testing/selftests/bpf/benchs/run_bench_rename.sh
 create mode 100755 tools/testing/selftests/bpf/benchs/run_bench_trigger.sh
 create mode 100644 tools/testing/selftests/bpf/progs/trigger_bench.c

-- 
2.24.1