#include "common.h"
#include "plugin.h"
-#define MODULE_NAME "cpufreq"
+#define MAX_AVAIL_FREQS 20
-static int num_cpu = 0;
+static int num_cpu;
+
+struct cpu_data_t {
+ value_to_rate_state_t time_state[MAX_AVAIL_FREQS];
+} * cpu_data;
+
+/* Flags denoting capability of reporting CPU frequency statistics. */
+static bool report_p_stats = false;
+
+static void cpufreq_stats_init(void) {
+ cpu_data = calloc(num_cpu, sizeof(struct cpu_data_t));
+ if (cpu_data == NULL)
+ return;
+
+ report_p_stats = true;
+
+ /* Check for stats module and disable if not present. */
+ for (int i = 0; i < num_cpu; i++) {
+ char filename[PATH_MAX];
+
+ snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", i);
+ if (access(filename, R_OK)) {
+ NOTICE("cpufreq plugin: File %s not exists or no access. P-State "
+ "statistics will not be reported. Check if `cpufreq-stats' kernel "
+ "module is loaded.",
+ filename);
+ report_p_stats = false;
+ break;
+ }
+
+ snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/stats/total_trans", i);
+ if (access(filename, R_OK)) {
+ NOTICE("cpufreq plugin: File %s not exists or no access. P-State "
+ "statistics will not be reported. Check if `cpufreq-stats' kernel "
+ "module is loaded.",
+ filename);
+ report_p_stats = false;
+ break;
+ }
+ }
+ return;
+}
static int cpufreq_init(void) {
- int status;
- char filename[256];
+ char filename[PATH_MAX];
num_cpu = 0;
while (1) {
- status = ssnprintf(filename, sizeof(filename),
- "/sys/devices/system/cpu/cpu%d/cpufreq/"
- "scaling_cur_freq",
- num_cpu);
+ int 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;
}
INFO("cpufreq plugin: Found %d CPU%s", num_cpu, (num_cpu == 1) ? "" : "s");
+ cpufreq_stats_init();
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];
+static void cpufreq_submit(int cpu_num, const char *type,
+ const char *type_instance, value_t *value) {
value_list_t vl = VALUE_LIST_INIT;
- values[0].gauge = value;
-
- vl.values = values;
+ vl.values = value;
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);
+ 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) {
- 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);
+ for (int cpu = 0; cpu < num_cpu; cpu++) {
+ char filename[PATH_MAX];
+ /* Read cpu frequency */
+ snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_cur_freq", cpu);
+
+ value_t v;
+ if (parse_value_file(filename, &v, DS_TYPE_GAUGE) != 0) {
+ WARNING("cpufreq plugin: Reading \"%s\" failed.", filename);
+ continue;
}
- if (fgets(buffer, 16, fp) == NULL) {
- char errbuf[1024];
- WARNING("cpufreq: fgets: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
- fclose(fp);
- return (-1);
+ /* convert kHz to Hz */
+ v.gauge *= 1000.0;
+
+ cpufreq_submit(cpu, "cpufreq", NULL, &v);
+
+ if (report_p_stats) {
+ /* Read total transitions for cpu frequency */
+ snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/stats/total_trans", cpu);
+ if (parse_value_file(filename, &v, DS_TYPE_COUNTER) != 0) {
+ ERROR("cpufreq plugin: Reading \"%s\" failed.", filename);
+ continue;
+ }
+ cpufreq_submit(cpu, "counter", "transitions", &v);
+
+ /* Determine percentage time in each state for cpu during previous
+ * interval. */
+ snprintf(filename, sizeof(filename),
+ "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state",
+ cpu);
+
+ FILE *fh = fopen(filename, "r");
+ if (fh == NULL) {
+ ERROR("cpufreq plugin: Reading \"%s\" failed.", filename);
+ continue;
+ }
+
+ int state_index = 0;
+ cdtime_t now = cdtime();
+ char buffer[DATA_MAX_NAME_LEN];
+
+ while (fgets(buffer, sizeof(buffer), fh) != NULL) {
+ unsigned int frequency;
+ unsigned long long time;
+
+ /*
+ * State time units is 10ms. To get rate of seconds per second
+ * we have to divide by 100. To get percents we have to multiply it
+ * by 100 back. So, just use parsed value directly.
+ */
+ if (!sscanf(buffer, "%u%llu", &frequency, &time)) {
+ ERROR("cpufreq plugin: Reading \"%s\" failed.", filename);
+ break;
+ }
+
+ char state[DATA_MAX_NAME_LEN];
+ snprintf(state, sizeof(state), "%u", frequency);
+
+ if (state_index >= MAX_AVAIL_FREQS) {
+ NOTICE("cpufreq plugin: Found too much frequency states (%d > %d). "
+ "Plugin needs to be recompiled. Please open a bug report for "
+ "this.",
+ (state_index + 1), MAX_AVAIL_FREQS);
+ break;
+ }
+
+ gauge_t g;
+ if (value_to_rate(&g, (value_t){.counter = time}, DS_TYPE_COUNTER, now,
+ &(cpu_data[cpu].time_state[state_index])) == 0) {
+ cpufreq_submit(cpu, "percent", state, &(value_t){.gauge = g});
+ }
+ state_index++;
+ }
+ fclose(fh);
}
-
- 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);
+ return 0;
} /* int cpufreq_read */
void module_register(void) {
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