#include "common.h"
#include "plugin.h"
-#define MODULE_NAME "cpufreq"
-
-static int num_cpu = 0;
+#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];
+static int cpufreq_init(void) {
+ int status;
+ char filename[256];
- num_cpu = 0;
+ num_cpu = 0;
- while (1)
- {
- status = ssnprintf (filename, sizeof (filename),
- "/sys/devices/system/cpu/cpu%d/cpufreq/"
- "scaling_cur_freq", num_cpu);
- if ((status < 1) || ((unsigned int)status >= sizeof (filename)))
- break;
+ while (1) {
+ status = snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/"
+ "scaling_cur_freq",
+ num_cpu);
+ if ((status < 1) || ((unsigned int)status >= sizeof(filename)))
+ break;
- if (access (filename, R_OK))
- break;
+ if (access(filename, R_OK))
+ break;
- num_cpu++;
- }
+ num_cpu++;
+ }
- INFO ("cpufreq plugin: Found %d CPU%s", num_cpu,
- (num_cpu == 1) ? "" : "s");
+ INFO("cpufreq plugin: Found %d CPU%s", num_cpu, (num_cpu == 1) ? "" : "s");
+ counter_init();
- if (num_cpu == 0)
- plugin_unregister_read ("cpufreq");
+ if (num_cpu == 0)
+ plugin_unregister_read("cpufreq");
- return (0);
+ return 0;
} /* int cpufreq_init */
-static void cpufreq_submit (int cpu_num, double value)
-{
- value_t values[1];
- value_list_t vl = VALUE_LIST_INIT;
-
- values[0].gauge = 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 = values;
- vl.values_len = 1;
- sstrncpy (vl.host, hostname_g, sizeof (vl.host));
- sstrncpy (vl.plugin, "cpufreq", sizeof (vl.plugin));
- sstrncpy (vl.type, "cpufreq", sizeof (vl.type));
- ssnprintf (vl.type_instance, sizeof (vl.type_instance),
- "%i", cpu_num);
+ vl.values = value;
+ vl.values_len = 1;
+ sstrncpy(vl.plugin, "cpufreq", sizeof(vl.plugin));
+ 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);
+ plugin_dispatch_values(&vl);
}
-static int cpufreq_read (void)
-{
- int status;
- unsigned long long val;
- FILE *fp;
- char filename[256];
- char buffer[16];
-
- for (int i = 0; i < num_cpu; i++)
- {
- status = ssnprintf (filename, sizeof (filename),
- "/sys/devices/system/cpu/cpu%d/cpufreq/"
- "scaling_cur_freq", i);
- if ((status < 1) || ((unsigned int)status >= sizeof (filename)))
- return (-1);
-
- if ((fp = fopen (filename, "r")) == NULL)
- {
- char errbuf[1024];
- WARNING ("cpufreq: fopen (%s): %s", filename,
- sstrerror (errno, errbuf,
- sizeof (errbuf)));
- return (-1);
- }
-
- if (fgets (buffer, 16, fp) == NULL)
- {
- char errbuf[1024];
- WARNING ("cpufreq: fgets: %s",
- sstrerror (errno, errbuf,
- sizeof (errbuf)));
- fclose (fp);
- return (-1);
- }
-
- if (fclose (fp))
- {
- char errbuf[1024];
- WARNING ("cpufreq: fclose: %s",
- sstrerror (errno, errbuf,
- sizeof (errbuf)));
- }
-
-
- /* You're seeing correctly: The file is reporting kHz values.. */
- val = atoll (buffer) * 1000;
-
- cpufreq_submit (i, val);
- }
-
- return (0);
+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);
+
+ value_t v;
+ if (parse_value_file(filename, &v, DS_TYPE_GAUGE) != 0) {
+ WARNING("cpufreq plugin: Reading \"%s\" failed.", filename);
+ continue;
+ }
+
+ /* convert kHz to Hz */
+ v.gauge *= 1000.0;
+
+ 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 */
-void module_register (void)
-{
- plugin_register_init ("cpufreq", cpufreq_init);
- plugin_register_read ("cpufreq", cpufreq_read);
+void module_register(void) {
+ plugin_register_init("cpufreq", cpufreq_init);
+ plugin_register_read("cpufreq", cpufreq_read);
}
projects / collectd.git / blobdiff