Clang format

[collectd.git] / src / cpufreq.c

diff --git a/src/cpufreq.c b/src/cpufreq.c
index 0139947..18e79d4 100644 (file)
--- a/src/cpufreq.c
+++ b/src/cpufreq.c
@@ -25,7 +25,58 @@
 #include "common.h"
 #include "plugin.h"
 
-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;
@@ -48,6 +99,7 @@ static int cpufreq_init(void) {
   }
 
   INFO("cpufreq plugin: Found %d CPU%s", num_cpu, (num_cpu == 1) ? "" : "s");
+  counter_init();
 
   if (num_cpu == 0)
     plugin_unregister_read("cpufreq");
@@ -55,14 +107,18 @@ static int cpufreq_init(void) {
   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);
 }
@@ -70,6 +126,10 @@ static void cpufreq_submit(int cpu_num, value_t value) {
 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);
 
@@ -82,9 +142,58 @@ static int cpufreq_read(void) {
     /* 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 */