src/proc_interrupts.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 static struct interrupt *alloc_interrupts(int lines) {
  29         static struct interrupt *irrs = NULL;
  30         static int alloced = 0;
  31
  32         if(lines < alloced) return irrs;
  33         else {
  34                 irrs = (struct interrupt *)realloc(irrs, lines * sizeof(struct interrupt));
  35                 if(!irrs)
  36                         fatal("Cannot allocate memory for %d interrupts", lines);
  37
  38                 alloced = lines;
  39         }
  40
  41         return irrs;
  42 }
  43
  44 int do_proc_interrupts(int update_every, unsigned long long dt) {
  45         static procfile *ff = NULL;
  46         static int cpus = -1, do_per_core = -1;
  47
  48         struct interrupt *irrs = NULL;
  49
  50         if(dt) {};
  51
  52         if(do_per_core == -1) do_per_core = config_get_boolean("plugin:proc:/proc/interrupts", "interrupts per core", 1);
  53
  54         if(!ff) {
  55                 char filename[FILENAME_MAX + 1];
  56                 snprintf(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/interrupts");
  57                 ff = procfile_open(config_get("plugin:proc:/proc/interrupts", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
  58         }
  59         if(!ff) return 1;
  60
  61         ff = procfile_readall(ff);
  62         if(!ff) return 0; // we return 0, so that we will retry to open it next time
  63
  64         uint32_t lines = procfile_lines(ff), l;
  65         uint32_t words = procfile_linewords(ff, 0), w;
  66
  67         if(!lines) {
  68                 error("Cannot read /proc/interrupts, zero lines reported.");
  69                 return 1;
  70         }
  71
  72         // find how many CPUs are there
  73         if(cpus == -1) {
  74                 cpus = 0;
  75                 for(w = 0; w < words ; w++) {
  76                         if(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0)
  77                                 cpus++;
  78                 }
  79
  80                 if(cpus > MAX_INTERRUPT_CPUS) cpus = MAX_INTERRUPT_CPUS;
  81         }
  82
  83         if(!cpus) {
  84                 error("PLUGIN: PROC_INTERRUPTS: Cannot find the number of CPUs in /proc/interrupts");
  85                 return 1;
  86         }
  87
  88         // allocate the size we need;
  89         irrs = alloc_interrupts(lines);
  90         irrs[0].used = 0;
  91
  92         // loop through all lines
  93         for(l = 1; l < lines ;l++) {
  94                 struct interrupt *irr = &irrs[l];
  95                 irr->used = 0;
  96                 irr->total = 0;
  97
  98                 words = procfile_linewords(ff, l);
  99                 if(!words) continue;
 100
 101                 irr->id = procfile_lineword(ff, l, 0);
 102                 if(!irr->id || !irr->id[0]) continue;
 103
 104                 int idlen = strlen(irr->id);
 105                 if(irr->id[idlen - 1] == ':')
 106                         irr->id[idlen - 1] = '\0';
 107
 108                 int c;
 109                 for(c = 0; c < cpus ;c++) {
 110                         if((c + 1) < (int)words)
 111                                 irr->value[c] = strtoull(procfile_lineword(ff, l, (uint32_t)(c + 1)), NULL, 10);
 112                         else
 113                                 irr->value[c] = 0;
 114
 115                         irr->total += irr->value[c];
 116                 }
 117
 118                 if(isdigit(irr->id[0]) && (uint32_t)(cpus + 2) < words) {
 119                         strncpy(irr->name, procfile_lineword(ff, l, words - 1), MAX_INTERRUPT_NAME);
 120                         irr->name[MAX_INTERRUPT_NAME] = '\0';
 121                         int nlen = strlen(irr->name);
 122                         if(nlen < (MAX_INTERRUPT_NAME-1)) {
 123                                 irr->name[nlen] = '_';
 124                                 strncpy(&irr->name[nlen + 1], irr->id, MAX_INTERRUPT_NAME - nlen);
 125                                 irr->name[MAX_INTERRUPT_NAME] = '\0';
 126                         }
 127                 }
 128                 else {
 129                         strncpy(irr->name, irr->id, MAX_INTERRUPT_NAME);
 130                         irr->name[MAX_INTERRUPT_NAME] = '\0';
 131                 }
 132
 133                 irr->used = 1;
 134         }
 135
 136         RRDSET *st;
 137
 138         // --------------------------------------------------------------------
 139
 140         st = rrdset_find_bytype("system", "interrupts");
 141         if(!st) {
 142                 st = rrdset_create("system", "interrupts", NULL, "interrupts", NULL, "System interrupts", "interrupts/s", 1000, update_every, RRDSET_TYPE_STACKED);
 143
 144                 for(l = 0; l < lines ;l++) {
 145                         if(!irrs[l].used) continue;
 146                         rrddim_add(st, irrs[l].id, irrs[l].name, 1, 1, RRDDIM_INCREMENTAL);
 147                 }
 148         }
 149         else rrdset_next(st);
 150
 151         for(l = 0; l < lines ;l++) {
 152                 if(!irrs[l].used) continue;
 153                 rrddim_set(st, irrs[l].id, irrs[l].total);
 154         }
 155         rrdset_done(st);
 156
 157         if(do_per_core) {
 158                 int c;
 159
 160                 for(c = 0; c < cpus ; c++) {
 161                         char id[256];
 162                         snprintf(id, 256, "cpu%d_interrupts", c);
 163
 164                         st = rrdset_find_bytype("cpu", id);
 165                         if(!st) {
 166                                 char name[256], title[256];
 167                                 snprintf(name, 256, "cpu%d_interrupts", c);
 168                                 snprintf(title, 256, "CPU%d Interrupts", c);
 169                                 st = rrdset_create("cpu", id, name, "interrupts", "cpu.interrupts", title, "interrupts/s", 2000 + c, update_every, RRDSET_TYPE_STACKED);
 170
 171                                 for(l = 0; l < lines ;l++) {
 172                                         if(!irrs[l].used) continue;
 173                                         rrddim_add(st, irrs[l].id, irrs[l].name, 1, 1, RRDDIM_INCREMENTAL);
 174                                 }
 175                         }
 176                         else rrdset_next(st);
 177
 178                         for(l = 0; l < lines ;l++) {
 179                                 if(!irrs[l].used) continue;
 180                                 rrddim_set(st, irrs[l].id, irrs[l].value[c]);
 181                         }
 182                         rrdset_done(st);
 183                 }
 184         }
 185
 186         return 0;
 187 }