pref使用记录

今天使用perf 进行 perf report -i perf.data 时，发现异常

                                                            Kernel address maps (/proc/{kallsyms,modules}) were restricted. 
                                                                                                                              
                                                            Check /proc/sys/kernel/kptr_restrict before running 'perf record'.
                                                                                                                              
                                                            As no suitable kallsyms nor vmlinux was found, kernel samples     
                                                            can't be resolved.                                                
                                                                                                                              
                                                            Samples in kernel modules can't be resolved as well.              
                                                                                                                              
                                                                                                                              
                                                                                                                              
                                                            Press any key...                                                  
                                                            

百度了半天没有结果，偶然发现执行 perf record 时应该使用ctrl c 进行退出，我是个憨憨。