#include "common.h"
#include "plugin.h"
+#define MAX_AVAIL_FREQS 20
+
static int num_cpu;
+struct thread_data {
+ value_to_rate_state_t time_state[MAX_AVAIL_FREQS];
+ long long transition_prev;
+} * t_data;
+
+/* Flags denoting capability of reporting stats. */
+unsigned report_time_in_state, report_total_trans;
+
+static int counter_init(void) {
+ t_data = calloc(num_cpu, sizeof(struct thread_data));
+ if (t_data == NULL)
+ return 0;
+
+ report_time_in_state = 1;
+ report_total_trans = 1;
+
+ /* Check for stats module and disable if not present. */
+ for (int i = 0; i < num_cpu; i++) {
+ char filename[256];
+ int status;
+ status = snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/"
+ "stats/time_in_state",
+ num_cpu);
+ if ((status < 1) || ((unsigned int)status >= sizeof(filename)))
+ report_time_in_state = 0;
+
+ status = snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/"
+ "stats/total_transitions",
+ num_cpu);
+ if ((status < 1) || ((unsigned int)status >= sizeof(filename)))
+ report_total_trans = 0;
+
+ /* Initialize total transitions for cpu frequency */
+ if (report_total_trans) {
+ value_t v;
+ snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/stats/total_trans", i);
+ if (parse_value_file(filename, &v, DS_TYPE_COUNTER) != 0) {
+ WARNING("cpufreq plugin: Reading \"%s\" failed.", filename);
+ continue;
+ }
+ t_data[i].transition_prev = v.counter;
+ }
+ }
+ return 0;
+}
+
static int cpufreq_init(void) {
int status;
char filename[256];
}
INFO("cpufreq plugin: Found %d CPU%s", num_cpu, (num_cpu == 1) ? "" : "s");
+ counter_init();
if (num_cpu == 0)
plugin_unregister_read("cpufreq");
return 0;
} /* int cpufreq_init */
-static void cpufreq_submit(int cpu_num, value_t value) {
+static void cpufreq_submit(int cpu_num, const char *type,
+ const char *type_instance, value_t *value) {
value_list_t vl = VALUE_LIST_INIT;
- vl.values = &value;
+ vl.values = value;
vl.values_len = 1;
sstrncpy(vl.plugin, "cpufreq", sizeof(vl.plugin));
- sstrncpy(vl.type, "cpufreq", sizeof(vl.type));
- snprintf(vl.type_instance, sizeof(vl.type_instance), "%i", cpu_num);
+ snprintf(vl.plugin_instance, sizeof(vl.plugin_instance), "%i", cpu_num);
+ if (type != NULL)
+ sstrncpy(vl.type, type, sizeof(vl.type));
+ if (type_instance != NULL)
+ sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
plugin_dispatch_values(&vl);
}
static int cpufreq_read(void) {
for (int i = 0; i < num_cpu; i++) {
char filename[PATH_MAX];
+ FILE *fh;
+ long long t;
+ char buffer[DATA_MAX_NAME_LEN];
+ /* Read cpu frequency */
snprintf(filename, sizeof(filename),
"/sys/devices/system/cpu/cpu%d/cpufreq/scaling_cur_freq", i);
/* convert kHz to Hz */
v.gauge *= 1000.0;
- cpufreq_submit(i, v);
- }
+ cpufreq_submit(i, "cpufreq", NULL, &v);
+
+ /* Read total transitions for cpu frequency */
+ if (report_total_trans) {
+ snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/stats/total_trans", i);
+ if (parse_value_file(filename, &v, DS_TYPE_COUNTER) != 0) {
+ WARNING("cpufreq plugin: Reading \"%s\" failed.", filename);
+ continue;
+ }
+ counter_t c = counter_diff(t_data[i].transition_prev, v.counter);
+ t_data[i].transition_prev = v.counter;
+ cpufreq_submit(i, "transitions", NULL, &(value_t){.counter = c});
+ }
+ /*
+ * Determine percentage time in each state for cpu during previous interval.
+ */
+ if (report_time_in_state) {
+ int j = 0;
+ char state[DATA_MAX_NAME_LEN], time[DATA_MAX_NAME_LEN];
+
+ snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", i);
+ fh = fopen(filename, "r");
+ if (fh == NULL)
+ continue;
+ while (fgets(buffer, sizeof(buffer), fh) != NULL) {
+ if (!sscanf(buffer, "%s%lli", state, &t)) {
+ fclose(fh);
+ return 0;
+ }
+ snprintf(time, sizeof(time), "%lli", t);
+ if (parse_value(time, &v, DS_TYPE_DERIVE) != 0) {
+ WARNING("cpufreq plugin: Reading \"%s\" failed.", filename);
+ continue;
+ }
+ cdtime_t now = cdtime();
+ gauge_t g;
+ if (j < MAX_AVAIL_FREQS) {
+ if (value_to_rate(&g, v, DS_TYPE_DERIVE, now,
+ &t_data[i].time_state[j]) != 0) {
+ continue;
+ j++;
+ }
+ cpufreq_submit(i, "percent", state, &(value_t){.gauge = g});
+ }
+ j++;
+ }
+ fclose(fh);
+ }
+ }
return 0;
} /* int cpufreq_read */