SINGLE_KEY 218 tools/perf/builtin-lock.c SINGLE_KEY(nr_contended) SINGLE_KEY 219 tools/perf/builtin-lock.c SINGLE_KEY(avg_wait_time) SINGLE_KEY 220 tools/perf/builtin-lock.c SINGLE_KEY(wait_time_total) SINGLE_KEY 221 tools/perf/builtin-lock.c SINGLE_KEY(wait_time_max)