84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <math.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/timeb.h>
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#include <sched.h>
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#include <errno.h>
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#include <string.h>
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#include "../kselftest.h"
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void usage(char *name) {
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printf ("Usage: %s cpunum\n", name);
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}
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int main(int argc, char **argv) {
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unsigned int i, cpu, fd;
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char msr_file_name[64];
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long long tsc, old_tsc, new_tsc;
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long long aperf, old_aperf, new_aperf;
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long long mperf, old_mperf, new_mperf;
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struct timeb before, after;
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long long int start, finish, total;
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cpu_set_t cpuset;
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if (argc != 2) {
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usage(argv[0]);
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return 1;
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}
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errno = 0;
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cpu = strtol(argv[1], (char **) NULL, 10);
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if (errno) {
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usage(argv[0]);
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return 1;
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}
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sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
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fd = open(msr_file_name, O_RDONLY);
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if (fd == -1) {
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printf("/dev/cpu/%d/msr: %s\n", cpu, strerror(errno));
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return KSFT_SKIP;
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}
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CPU_ZERO(&cpuset);
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CPU_SET(cpu, &cpuset);
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if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) {
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perror("Failed to set cpu affinity");
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return 1;
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}
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ftime(&before);
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pread(fd, &old_tsc, sizeof(old_tsc), 0x10);
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pread(fd, &old_aperf, sizeof(old_mperf), 0xe7);
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pread(fd, &old_mperf, sizeof(old_aperf), 0xe8);
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for (i=0; i<0x8fffffff; i++) {
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sqrt(i);
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}
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ftime(&after);
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pread(fd, &new_tsc, sizeof(new_tsc), 0x10);
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pread(fd, &new_aperf, sizeof(new_mperf), 0xe7);
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pread(fd, &new_mperf, sizeof(new_aperf), 0xe8);
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tsc = new_tsc-old_tsc;
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aperf = new_aperf-old_aperf;
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mperf = new_mperf-old_mperf;
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start = before.time*1000 + before.millitm;
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finish = after.time*1000 + after.millitm;
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total = finish - start;
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printf("runTime: %4.2f\n", 1.0*total/1000);
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printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
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return 0;
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}
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