From: Pavel Rochnyack <pavel2000@ngs.ru>
Date: Sun, 21 Oct 2018 16:51:12 +0000 (+0700)
Subject: cpufreq plugin: Address code review comments
X-Git-Url: https://git.octo.it/?p=collectd.git;a=commitdiff_plain;h=11ce5d9e615cf2a58ea25e7571079ee8b03e1de3

cpufreq plugin: Address code review comments
---

diff --git a/src/cpufreq.c b/src/cpufreq.c
index 6c2689ff..3e3244cc 100644
--- a/src/cpufreq.c
+++ b/src/cpufreq.c
@@ -116,6 +116,69 @@ static void cpufreq_submit(int cpu_num, const char *type,
   plugin_dispatch_values(&vl);
 }
 
+static void cpufreq_read_stats(int cpu) {
+  char filename[PATH_MAX];
+  /* Read total transitions for cpu frequency */
+  snprintf(filename, sizeof(filename),
+           "/sys/devices/system/cpu/cpu%d/cpufreq/stats/total_trans", cpu);
+
+  value_t v;
+  if (parse_value_file(filename, &v, DS_TYPE_DERIVE) != 0) {
+    ERROR("cpufreq plugin: Reading \"%s\" failed.", filename);
+    return;
+  }
+  cpufreq_submit(cpu, "transitions", NULL, &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);
+    return;
+  }
+
+  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 many 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){.derive = time}, DS_TYPE_DERIVE, now,
+                      &(cpu_data[cpu].time_state[state_index])) == 0) {
+      cpufreq_submit(cpu, "percent", state, &(value_t){.gauge = g});
+    }
+    state_index++;
+  }
+  fclose(fh);
+}
+
 static int cpufreq_read(void) {
   for (int cpu = 0; cpu < num_cpu; cpu++) {
     char filename[PATH_MAX];
@@ -134,66 +197,8 @@ static int cpufreq_read(void) {
 
     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 (report_p_stats)
+      cpufreq_read_stats(cpu);
   }
   return 0;
 } /* int cpufreq_read */
diff --git a/src/types.db b/src/types.db
index 0370b7f0..e9de64fc 100644
--- a/src/types.db
+++ b/src/types.db
@@ -260,6 +260,7 @@ total_threads           value:DERIVE:0:U
 total_time_in_ms        value:DERIVE:0:U
 total_values            value:DERIVE:0:U
 turbo_enabled           value:GAUGE:0:1
+transitions             value:DERIVE:0:U
 uptime                  value:GAUGE:0:4294967295
 uncore_ratio            value:GAUGE:0:U
 users                   value:GAUGE:0:65535