perf cache

root@ubuntu:~/cmd# perf stat -a -e  L1-dcache-load-misses,L1-icache-load-misses  -p 206 -- sleep 5                                                                                                                                                         

 Performance counter stats for process id '206':

       114,289,768      L1-dcache-load-misses                                       
       355,565,661      L1-icache-load-misses                                       

       5.001419998 seconds time elapsed

root@ubuntu:~/cmd

perf stat -B -e cache-references,cache-misses ./test5 64

上面的cache-references,cache-misses两个事件分别代表缓存命中和未命中