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37 #define MAX_BUF_SIZE 64
45 long unsigned utime, ntime, stime, itime, iowtime, irqtime, sirqtime;
46 struct freq_info *freqs;
50 #define die(...) { fprintf(stderr, __VA_ARGS__); exit(EXIT_FAILURE); }
52 static struct cpu_info old_total_cpu, new_total_cpu, *old_cpus, *new_cpus;
53 static int cpu_count, delay, iterations;
54 static char minimal, aggregate_freq_stats;
56 static int get_cpu_count();
57 static int get_cpu_count_from_file(char *filename);
58 static long unsigned get_cpu_total_time(struct cpu_info *cpu);
59 static int get_freq_scales_count(int cpu);
60 static void print_stats();
61 static void print_cpu_stats(char *label, struct cpu_info *new_cpu, struct cpu_info *old_cpu,
63 static void print_freq_stats(struct cpu_info *new_cpu, struct cpu_info *old_cpu);
64 static void read_stats();
65 static void read_freq_stats(int cpu);
66 static char should_aggregate_freq_stats();
67 static char should_print_freq_stats();
68 static void usage(char *cmd);
70 int main(int argc, char *argv[]) {
71 struct cpu_info *tmp_cpus, tmp_total_cpu;
77 aggregate_freq_stats = 0;
79 for (i = 0; i < argc; i++) {
80 if (!strcmp(argv[i], "-n")) {
82 fprintf(stderr, "Option -n expects an argument.\n");
86 iterations = atoi(argv[++i]);
89 if (!strcmp(argv[i], "-d")) {
91 fprintf(stderr, "Option -d expects an argument.\n");
95 delay = atoi(argv[++i]);
98 if (!strcmp(argv[i], "-m")) {
101 if (!strcmp(argv[i], "-h")) {
107 cpu_count = get_cpu_count();
109 old_cpus = malloc(sizeof(struct cpu_info) * cpu_count);
110 if (!old_cpus) die("Could not allocate struct cpu_info\n");
111 new_cpus = malloc(sizeof(struct cpu_info) * cpu_count);
112 if (!new_cpus) die("Could not allocate struct cpu_info\n");
114 for (i = 0; i < cpu_count; i++) {
115 old_cpus[i].freq_count = new_cpus[i].freq_count = get_freq_scales_count(i);
116 new_cpus[i].freqs = malloc(sizeof(struct freq_info) * new_cpus[i].freq_count);
117 if (!new_cpus[i].freqs) die("Could not allocate struct freq_info\n");
118 old_cpus[i].freqs = malloc(sizeof(struct freq_info) * old_cpus[i].freq_count);
119 if (!old_cpus[i].freqs) die("Could not allocate struct freq_info\n");
122 // Read stats without aggregating freq stats in the total cpu
125 aggregate_freq_stats = should_aggregate_freq_stats();
126 if (aggregate_freq_stats) {
127 old_total_cpu.freq_count = new_total_cpu.freq_count = new_cpus[0].freq_count;
128 new_total_cpu.freqs = malloc(sizeof(struct freq_info) * new_total_cpu.freq_count);
129 if (!new_total_cpu.freqs) die("Could not allocate struct freq_info\n");
130 old_total_cpu.freqs = malloc(sizeof(struct freq_info) * old_total_cpu.freq_count);
131 if (!old_total_cpu.freqs) die("Could not allocate struct freq_info\n");
133 // Read stats again with aggregating freq stats in the total cpu
137 while ((iterations == -1) || (iterations-- > 0)) {
138 // Swap new and old cpu buffers;
139 tmp_total_cpu = old_total_cpu;
140 old_total_cpu = new_total_cpu;
141 new_total_cpu = tmp_total_cpu;
153 if (aggregate_freq_stats) {
154 free(new_total_cpu.freqs);
155 free(old_total_cpu.freqs);
157 for (i = 0; i < cpu_count; i++) {
158 free(new_cpus[i].freqs);
159 free(old_cpus[i].freqs);
168 * Get the number of CPUs of the system.
170 * Uses the two files /sys/devices/system/cpu/present and
171 * /sys/devices/system/cpu/online to determine the number of CPUs. Expects the
172 * format of both files to be either 0 or 0-N where N+1 is the number of CPUs.
174 * Exits if the present CPUs is not equal to the online CPUs
176 static int get_cpu_count() {
177 int cpu_count = get_cpu_count_from_file("/sys/devices/system/cpu/present");
178 if (cpu_count != get_cpu_count_from_file("/sys/devices/system/cpu/online")) {
179 die("present cpus != online cpus\n");
185 * Get the number of CPUs from a given filename.
187 static int get_cpu_count_from_file(char *filename) {
189 char line[MAX_BUF_SIZE];
192 file = fopen(filename, "r");
193 if (!file) die("Could not open %s\n", filename);
194 if (!fgets(line, MAX_BUF_SIZE, file)) die("Could not get %s contents\n", filename);
197 if (strcmp(line, "0\n") == 0) {
201 if (1 == sscanf(line, "0-%d\n", &cpu_count)) {
202 return cpu_count + 1;
205 die("Unexpected input in file %s (%s).\n", filename, line);
210 * Get the number of frequency states a given CPU can be scaled to.
212 static int get_freq_scales_count(int cpu) {
214 char filename[MAX_BUF_SIZE];
218 sprintf(filename, "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", cpu);
219 file = fopen(filename, "r");
220 if (!file) die("Could not open %s\n", filename);
223 fscanf(file, "%lu %*d\n", &freq);
232 * Read the CPU and frequency stats for all cpus.
234 static void read_stats() {
236 char scanline[MAX_BUF_SIZE];
239 file = fopen("/proc/stat", "r");
240 if (!file) die("Could not open /proc/stat.\n");
241 fscanf(file, "cpu %lu %lu %lu %lu %lu %lu %lu %*d %*d %*d\n",
242 &new_total_cpu.utime, &new_total_cpu.ntime, &new_total_cpu.stime, &new_total_cpu.itime,
243 &new_total_cpu.iowtime, &new_total_cpu.irqtime, &new_total_cpu.sirqtime);
244 if (aggregate_freq_stats) {
245 for (i = 0; i < new_total_cpu.freq_count; i++) {
246 new_total_cpu.freqs[i].time = 0;
250 for (i = 0; i < cpu_count; i++) {
251 sprintf(scanline, "cpu%d %%lu %%lu %%lu %%lu %%lu %%lu %%lu %%*d %%*d %%*d\n", i);
252 fscanf(file, scanline, &new_cpus[i].utime, &new_cpus[i].ntime, &new_cpus[i].stime,
253 &new_cpus[i].itime, &new_cpus[i].iowtime, &new_cpus[i].irqtime,
254 &new_cpus[i].sirqtime);
261 * Read the frequency stats for a given cpu.
263 static void read_freq_stats(int cpu) {
265 char filename[MAX_BUF_SIZE];
268 sprintf(filename, "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", cpu);
269 file = fopen(filename, "r");
270 if (!file) die("Could not open %s\n", filename);
271 for (i = 0; i < new_cpus[cpu].freq_count; i++) {
272 fscanf(file, "%u %lu\n", &new_cpus[cpu].freqs[i].freq,
273 &new_cpus[cpu].freqs[i].time);
274 if (aggregate_freq_stats) {
275 new_total_cpu.freqs[i].freq = new_cpus[cpu].freqs[i].freq;
276 new_total_cpu.freqs[i].time += new_cpus[cpu].freqs[i].time;
283 * Get the sum of the cpu time from all categories.
285 static long unsigned get_cpu_total_time(struct cpu_info *cpu) {
286 return (cpu->utime + cpu->ntime + cpu->stime + cpu->itime + cpu->iowtime + cpu->irqtime +
291 * Print the stats for all CPUs.
293 static void print_stats() {
298 print_freq = should_print_freq_stats();
300 print_cpu_stats("Total", &new_total_cpu, &old_total_cpu, 1);
301 for (i = 0; i < cpu_count; i++) {
302 sprintf(label, "cpu%d", i);
303 print_cpu_stats(label, &new_cpus[i], &old_cpus[i], print_freq);
309 * Print the stats for a single CPU.
311 static void print_cpu_stats(char *label, struct cpu_info *new_cpu, struct cpu_info *old_cpu,
313 long int total_delta_time;
316 total_delta_time = get_cpu_total_time(new_cpu) - get_cpu_total_time(old_cpu);
317 printf("%s: User %ld + Nice %ld + Sys %ld + Idle %ld + IOW %ld + IRQ %ld + SIRQ %ld = "
319 new_cpu->utime - old_cpu->utime,
320 new_cpu->ntime - old_cpu->ntime,
321 new_cpu->stime - old_cpu->stime,
322 new_cpu->itime - old_cpu->itime,
323 new_cpu->iowtime - old_cpu->iowtime,
324 new_cpu->irqtime - old_cpu->irqtime,
325 new_cpu->sirqtime - old_cpu->sirqtime,
328 print_freq_stats(new_cpu, old_cpu);
331 printf("%s,%ld,%ld,%ld,%ld,%ld,%ld,%ld", label,
332 new_cpu->utime - old_cpu->utime,
333 new_cpu->ntime - old_cpu->ntime,
334 new_cpu->stime - old_cpu->stime,
335 new_cpu->itime - old_cpu->itime,
336 new_cpu->iowtime - old_cpu->iowtime,
337 new_cpu->irqtime - old_cpu->irqtime,
338 new_cpu->sirqtime - old_cpu->sirqtime);
339 print_freq_stats(new_cpu, old_cpu);
345 * Print the CPU stats for a single CPU.
347 static void print_freq_stats(struct cpu_info *new_cpu, struct cpu_info *old_cpu) {
348 long int delta_time, total_delta_time;
351 if (new_cpu->freq_count > 0) {
353 total_delta_time = 0;
355 for (i = 0; i < new_cpu->freq_count; i++) {
356 delta_time = new_cpu->freqs[i].time - old_cpu->freqs[i].time;
357 total_delta_time += delta_time;
358 printf("%ukHz %ld", new_cpu->freqs[i].freq, delta_time);
359 if (i + 1 != new_cpu->freq_count) {
365 printf("%ld\n", total_delta_time);
367 for (i = 0; i < new_cpu->freq_count; i++) {
368 printf(",%u,%ld", new_cpu->freqs[i].freq,
369 new_cpu->freqs[i].time - old_cpu->freqs[i].time);
376 * Determine if frequency stats should be printed.
378 * If the frequency stats are different between CPUs, the stats should be
379 * printed for each CPU, else only the aggregate frequency stats should be
382 static char should_print_freq_stats() {
385 for (i = 1; i < cpu_count; i++) {
386 for (j = 0; j < new_cpus[i].freq_count; j++) {
387 if (new_cpus[i].freqs[j].time - old_cpus[i].freqs[j].time !=
388 new_cpus[0].freqs[j].time - old_cpus[0].freqs[j].time) {
397 * Determine if the frequency stats should be aggregated.
399 * Only aggregate the frequency stats in the total cpu stats if the frequencies
400 * reported by all CPUs are identical. Must be called after read_stats() has
403 static char should_aggregate_freq_stats() {
406 for (i = 1; i < cpu_count; i++) {
407 if (new_cpus[i].freq_count != new_cpus[0].freq_count) {
410 for (j = 0; j < new_cpus[i].freq_count; j++) {
411 if (new_cpus[i].freqs[j].freq != new_cpus[0].freqs[j].freq) {
421 * Print the usage message.
423 static void usage(char *cmd) {
424 fprintf(stderr, "Usage %s [ -n iterations ] [ -d delay ] [ -c cpu ] [ -m ] [ -h ]\n"
425 " -n num Updates to show before exiting.\n"
426 " -d num Seconds to wait between updates.\n"
427 " -m Display minimal output.\n"
428 " -h Display this help screen.\n",