perf

Process Profiling

1. Perf + FlameGraph Process의 FlameGraph를 뽑아내는 과정을 설명한다. Perf의 --call-graph 기능을 이용한다. 1) Kernel setting echo -1 > /proc/sys/kernel/perf_event_paranoid echo 0 > /proc/sys/kernel/kptr_restrict chmod a+r /proc/kallsyms echo 100 > /proc/sys/kernel/perf_cpu_time_max_percent echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor 2) Get perf data perf record -o perf.data --call-graph=..