Pref usage record

Use today perf Conduct perf report -i perf.data when , Exception found

                                                            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.              
                                                                                                                              
                                                                                                                              
                                                                                                                              
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Baidu for a long time without results , Accidental discovery execution perf record You should use ctrl c Proceed to exit , I'm a Han Han .