src/proc_interrupts.c

   1 #include <inttypes.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <ctype.h>
   6
   7 #include "common.h"
   8 #include "config.h"
   9 #include "procfile.h"
  10 #include "rrd.h"
  11 #include "plugin_proc.h"
  12 #include "log.h"
  13
  14 #define MAX_INTERRUPTS 256
  15 #define MAX_INTERRUPT_CPUS 256
  16 #define MAX_INTERRUPT_NAME 20
  17
  18 struct interrupt {
  19         int used;
  20         char *id;
  21         char *name;
  22         unsigned long long value[MAX_INTERRUPT_CPUS];
  23         unsigned long long total;
  24 };
  25
  26 int do_proc_interrupts(int update_every, unsigned long long dt) {
  27         static procfile *ff = NULL;
  28         static int cpus = -1, do_per_core = -1;
  29
  30         if(dt) {};
  31
  32         if(do_per_core == -1) do_per_core = config_get_boolean("plugin:proc:/proc/interrupts", "interrupts per core", 0);
  33
  34         if(!ff) ff = procfile_open("/proc/interrupts", " \t", PROCFILE_FLAG_DEFAULT);
  35         if(!ff) return 1;
  36
  37         ff = procfile_readall(ff);
  38         if(!ff) return 0; // we return 0, so that we will retry to open it next time
  39
  40         uint32_t lines = procfile_lines(ff), l;
  41         uint32_t words = procfile_linewords(ff, 0), w;
  42
  43         // find how many CPUs are there
  44         if(cpus == -1) {
  45                 cpus = 0;
  46                 for(w = 0; w < words ; w++) {
  47                         if(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0)
  48                                 cpus++;
  49                 }
  50
  51                 if(cpus > MAX_INTERRUPT_CPUS) cpus = MAX_INTERRUPT_CPUS;
  52         }
  53
  54         if(!cpus) {
  55                 error("PLUGIN: PROC_INTERRUPTS: Cannot find the number of CPUs in /proc/interrupts");
  56                 return 1;
  57         }
  58
  59         // allocate the size we need;
  60         struct interrupt irrs[lines];
  61         irrs[0].used = 0;
  62
  63         // loop through all lines
  64         for(l = 1; l < lines ;l++) {
  65                 struct interrupt *irr = &irrs[l];
  66                 irr->used = 0;
  67                 irr->total = 0;
  68
  69                 words = procfile_linewords(ff, l);
  70                 if(!words) continue;
  71
  72                 irr->id = procfile_lineword(ff, l, 0);
  73                 if(!irr->id || !irr->id[0]) continue;
  74
  75                 if(irr->id[strlen(irr->id) - 1] == ':')
  76                         irr->id[strlen(irr->id) - 1] = '\0';
  77
  78                 int c;
  79                 for(c = 0; c < cpus ;c++) {
  80                         if((c + 1) < (int)words)
  81                                 irr->value[c] = strtoull(procfile_lineword(ff, l, (uint32_t)(c + 1)), NULL, 10);
  82                         else
  83                                 irr->value[c] = 0;
  84
  85                         irr->total += irr->value[c];
  86                 }
  87
  88                 if(isdigit(irr->id[0]) && (uint32_t)(cpus + 2) < words) {
  89                         irr->name = procfile_lineword(ff, l, words - 1);
  90                 }
  91                 else
  92                         irr->name = irr->id;
  93
  94                 irr->used = 1;
  95         }
  96
  97         RRDSET *st;
  98
  99         // --------------------------------------------------------------------
 100
 101         st = rrdset_find_bytype("system", "interrupts");
 102         if(!st) {
 103                 st = rrdset_create("system", "interrupts", NULL, "system", "System interrupts", "interrupts/s", 1000, update_every, RRDSET_TYPE_STACKED);
 104
 105                 for(l = 0; l < lines ;l++) {
 106                         if(!irrs[l].used) continue;
 107                         rrddim_add(st, irrs[l].id, irrs[l].name, 1, update_every, RRDDIM_INCREMENTAL);
 108                 }
 109         }
 110         else rrdset_next(st);
 111
 112         for(l = 0; l < lines ;l++) {
 113                 if(!irrs[l].used) continue;
 114                 rrddim_set(st, irrs[l].id, irrs[l].total);
 115         }
 116         rrdset_done(st);
 117
 118         if(do_per_core) {
 119                 int c;
 120
 121                 for(c = 0; c < cpus ; c++) {
 122                         char id[256];
 123                         snprintf(id, 256, "cpu%d_interrupts", c);
 124
 125                         st = rrdset_find_bytype("cpu", id);
 126                         if(!st) {
 127                                 char name[256], title[256];
 128                                 snprintf(name, 256, "cpu%d_interrupts", c);
 129                                 snprintf(title, 256, "CPU%d Interrupts", c);
 130                                 st = rrdset_create("cpu", id, name, "cpu", title, "interrupts/s", 2000 + c, update_every, RRDSET_TYPE_STACKED);
 131
 132                                 for(l = 0; l < lines ;l++) {
 133                                         if(!irrs[l].used) continue;
 134                                         rrddim_add(st, irrs[l].id, irrs[l].name, 1, update_every, RRDDIM_INCREMENTAL);
 135                                 }
 136                         }
 137                         else rrdset_next(st);
 138
 139                         for(l = 0; l < lines ;l++) {
 140                                 if(!irrs[l].used) continue;
 141                                 rrddim_set(st, irrs[l].id, irrs[l].value[c]);
 142                         }
 143                         rrdset_done(st);
 144                 }
 145         }
 146
 147         return 0;
 148 }