src/proc_softirqs.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <ctype.h>
   8
   9 #include "common.h"
  10 #include "appconfig.h"
  11 #include "procfile.h"
  12 #include "rrd.h"
  13 #include "plugin_proc.h"
  14 #include "log.h"
  15
  16 #define MAX_INTERRUPTS 256
  17 #define MAX_INTERRUPT_CPUS 256
  18 #define MAX_INTERRUPT_NAME 50
  19
  20 struct interrupt {
  21         int used;
  22         char *id;
  23         char name[MAX_INTERRUPT_NAME + 1];
  24         unsigned long long value[MAX_INTERRUPT_CPUS];
  25         unsigned long long total;
  26 };
  27
  28 int do_proc_softirqs(int update_every, unsigned long long dt) {
  29         static procfile *ff = NULL;
  30         static int cpus = -1, do_per_core = -1;
  31
  32         if(dt) {};
  33
  34         if(do_per_core == -1) do_per_core = config_get_boolean("plugin:proc:/proc/softirqs", "interrupts per core", 1);
  35
  36         if(!ff) {
  37                 char filename[FILENAME_MAX + 1];
  38                 snprintf(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/softirqs");
  39                 ff = procfile_open(config_get("plugin:proc:/proc/softirqs", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
  40         }
  41         if(!ff) return 1;
  42
  43         ff = procfile_readall(ff);
  44         if(!ff) return 0; // we return 0, so that we will retry to open it next time
  45
  46         uint32_t lines = procfile_lines(ff), l;
  47         uint32_t words = procfile_linewords(ff, 0), w;
  48
  49         if(!lines) {
  50                 error("Cannot read /proc/softirqs, zero lines reported.");
  51                 return 1;
  52         }
  53
  54         // find how many CPUs are there
  55         if(cpus == -1) {
  56                 cpus = 0;
  57                 for(w = 0; w < words ; w++) {
  58                         if(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0)
  59                                 cpus++;
  60                 }
  61
  62                 if(cpus > MAX_INTERRUPT_CPUS) cpus = MAX_INTERRUPT_CPUS;
  63         }
  64
  65         if(!cpus) {
  66                 error("PLUGIN: PROC_SOFTIRQS: Cannot find the number of CPUs in /proc/softirqs");
  67                 return 1;
  68         }
  69
  70         // allocate the size we need;
  71         struct interrupt irrs[lines];
  72         irrs[0].used = 0;
  73
  74         // loop through all lines
  75         for(l = 1; l < lines ;l++) {
  76                 struct interrupt *irr = &irrs[l];
  77                 irr->used = 0;
  78                 irr->total = 0;
  79
  80                 words = procfile_linewords(ff, l);
  81                 if(!words) continue;
  82
  83                 irr->id = procfile_lineword(ff, l, 0);
  84                 if(!irr->id || !irr->id[0]) continue;
  85
  86                 int idlen = strlen(irr->id);
  87                 if(irr->id[idlen - 1] == ':')
  88                         irr->id[idlen - 1] = '\0';
  89
  90                 int c;
  91                 for(c = 0; c < cpus ;c++) {
  92                         if((c + 1) < (int)words)
  93                                 irr->value[c] = strtoull(procfile_lineword(ff, l, (uint32_t)(c + 1)), NULL, 10);
  94                         else
  95                                 irr->value[c] = 0;
  96
  97                         irr->total += irr->value[c];
  98                 }
  99
 100                 strncpy(irr->name, irr->id, MAX_INTERRUPT_NAME);
 101                 irr->name[MAX_INTERRUPT_NAME] = '\0';
 102
 103                 irr->used = 1;
 104         }
 105
 106         RRDSET *st;
 107
 108         // --------------------------------------------------------------------
 109
 110         st = rrdset_find_bytype("system", "softirqs");
 111         if(!st) {
 112                 st = rrdset_create("system", "softirqs", NULL, "softirqs", NULL, "System softirqs", "softirqs/s", 950, update_every, RRDSET_TYPE_STACKED);
 113
 114                 for(l = 0; l < lines ;l++) {
 115                         if(!irrs[l].used) continue;
 116                         rrddim_add(st, irrs[l].id, irrs[l].name, 1, 1, RRDDIM_INCREMENTAL);
 117                 }
 118         }
 119         else rrdset_next(st);
 120
 121         for(l = 0; l < lines ;l++) {
 122                 if(!irrs[l].used) continue;
 123                 rrddim_set(st, irrs[l].id, irrs[l].total);
 124         }
 125         rrdset_done(st);
 126
 127         if(do_per_core) {
 128                 int c;
 129
 130                 for(c = 0; c < cpus ; c++) {
 131                         char id[256];
 132                         snprintf(id, 256, "cpu%d_softirqs", c);
 133
 134                         st = rrdset_find_bytype("cpu", id);
 135                         if(!st) {
 136                                 // find if everything is zero
 137                                 unsigned long long core_sum = 0 ;
 138                                 for(l = 0; l < lines ;l++) {
 139                                         if(!irrs[l].used) continue;
 140                                         core_sum += irrs[l].value[c];
 141                                 }
 142                                 if(core_sum == 0) continue; // try next core
 143
 144                                 char name[256], title[256];
 145                                 snprintf(name, 256, "cpu%d_softirqs", c);
 146                                 snprintf(title, 256, "CPU%d softirqs", c);
 147                                 st = rrdset_create("cpu", id, name, "softirqs", "cpu.softirqs", title, "softirqs/s", 3000 + c, update_every, RRDSET_TYPE_STACKED);
 148
 149                                 for(l = 0; l < lines ;l++) {
 150                                         if(!irrs[l].used) continue;
 151                                         rrddim_add(st, irrs[l].id, irrs[l].name, 1, 1, RRDDIM_INCREMENTAL);
 152                                 }
 153                         }
 154                         else rrdset_next(st);
 155
 156                         for(l = 0; l < lines ;l++) {
 157                                 if(!irrs[l].used) continue;
 158                                 rrddim_set(st, irrs[l].id, irrs[l].value[c]);
 159                         }
 160                         rrdset_done(st);
 161                 }
 162         }
 163
 164         return 0;
 165 }