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Linux/tools/testing/selftests/intel_pstate/aperf.c

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  1 #include <math.h>
  2 #include <unistd.h>
  3 #include <stdio.h>
  4 #include <stdlib.h>
  5 #include <sys/types.h>
  6 #include <sys/stat.h>
  7 #include <fcntl.h>
  8 #include <sys/timeb.h>
  9 #include <sched.h>
 10 #include <errno.h>
 11 
 12 void usage(char *name) {
 13         printf ("Usage: %s cpunum\n", name);
 14 }
 15 
 16 int main(int argc, char **argv) {
 17         unsigned int i, cpu, fd;
 18         char msr_file_name[64];
 19         long long tsc, old_tsc, new_tsc;
 20         long long aperf, old_aperf, new_aperf;
 21         long long mperf, old_mperf, new_mperf;
 22         struct timeb before, after;
 23         long long int start, finish, total;
 24         cpu_set_t cpuset;
 25 
 26         if (argc != 2) {
 27                 usage(argv[0]);
 28                 return 1;
 29         }
 30 
 31         errno = 0;
 32         cpu = strtol(argv[1], (char **) NULL, 10);
 33 
 34         if (errno) {
 35                 usage(argv[0]);
 36                 return 1;
 37         }
 38 
 39         sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
 40         fd = open(msr_file_name, O_RDONLY);
 41 
 42         if (fd == -1) {
 43                 perror("Failed to open");
 44                 return 1;
 45         }
 46 
 47         CPU_ZERO(&cpuset);
 48         CPU_SET(cpu, &cpuset);
 49 
 50         if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) {
 51                 perror("Failed to set cpu affinity");
 52                 return 1;
 53         }
 54 
 55         ftime(&before);
 56         pread(fd, &old_tsc,  sizeof(old_tsc), 0x10);
 57         pread(fd, &old_aperf,  sizeof(old_mperf), 0xe7);
 58         pread(fd, &old_mperf,  sizeof(old_aperf), 0xe8);
 59 
 60         for (i=0; i<0x8fffffff; i++) {
 61                 sqrt(i);
 62         }
 63 
 64         ftime(&after);
 65         pread(fd, &new_tsc,  sizeof(new_tsc), 0x10);
 66         pread(fd, &new_aperf,  sizeof(new_mperf), 0xe7);
 67         pread(fd, &new_mperf,  sizeof(new_aperf), 0xe8);
 68 
 69         tsc = new_tsc-old_tsc;
 70         aperf = new_aperf-old_aperf;
 71         mperf = new_mperf-old_mperf;
 72 
 73         start = before.time*1000 + before.millitm;
 74         finish = after.time*1000 + after.millitm;
 75         total = finish - start;
 76 
 77         printf("runTime: %4.2f\n", 1.0*total/1000);
 78         printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
 79         return 0;
 80 }
 81 

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