PERF_ITRACE_DEFAULT_CALLCHAIN_SZ 991 tools/perf/util/auxtrace.c synth_opts->callchain_sz = PERF_ITRACE_DEFAULT_CALLCHAIN_SZ; PERF_ITRACE_DEFAULT_CALLCHAIN_SZ 1098 tools/perf/util/auxtrace.c PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;