Method usedMemory

src/flightRecorder.cpp:410–413

    }

    size_t usedMemory() {
        return _method_map.usedMemory() + _thread_set.usedMemory() +
               (_memfd >= 0 ? lseek(_memfd, 0, SEEK_CUR) : 0);
    }

    void cpuMonitorCycle() {
        if (!_cpu_monitor_enabled) return;