Merge branch 'benchmark-runner'

Merge branch 'benchmark-runner'

Andrii Nakryiko says:

====================
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 extracts parse_num_list to be re-used between test_progs and bench.

Patch #2 adds generic runner implementation and atomic counter benchmarks to
validate benchmark runner's behavior.

Patch #3 implements test_overhead benchmark as part of bench runner. It also
add fmod_ret BPF program type to a set of benchmarks.

Patch #4 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.

v2->v3:
  - added --prod-affinity and --cons-affinity (Yonghong);
  - removed ringbuf-related options leftovers (Yonghong);
  - added more benchmarking results for test_overhead performance discrepancies;
v1->v2:
  - moved benchmarks into benchs/ subdir (John);
  - added benchmark "suite" scripts (John);
  - few small clean ups, change defaults, etc.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>