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93 lines
2.1 KiB
93 lines
2.1 KiB
// 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 <time.h> |
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#include "../kselftest.h" |
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#define MSEC_PER_SEC 1000L |
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#define NSEC_PER_MSEC 1000000L |
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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 timespec 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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if (clock_gettime(CLOCK_MONOTONIC, &before) < 0) { |
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perror("clock_gettime"); |
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return 1; |
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} |
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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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if (clock_gettime(CLOCK_MONOTONIC, &after) < 0) { |
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perror("clock_gettime"); |
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return 1; |
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} |
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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.tv_sec*MSEC_PER_SEC + before.tv_nsec/NSEC_PER_MSEC; |
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finish = after.tv_sec*MSEC_PER_SEC + after.tv_nsec/NSEC_PER_MSEC; |
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total = finish - start; |
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printf("runTime: %4.2f\n", 1.0*total/MSEC_PER_SEC); |
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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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