src/sys_devices_system_node.c

   1 #include "common.h"
   2
   3 struct node {
   4     char *name;
   5     char *numastat_filename;
   6     procfile *numastat_ff;
   7     RRDSET *numastat_st;
   8     struct node *next;
   9 };
  10 static struct node *numa_root = NULL;
  11
  12 static int find_all_nodes() {
  13     int numa_node_count = 0;
  14     char name[FILENAME_MAX + 1];
  15     snprintfz(name, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/devices/system/node");
  16     char *dirname = config_get("plugin:proc:/sys/devices/system/node", "directory to monitor", name);
  17
  18     DIR *dir = opendir(dirname);
  19     if(!dir) {
  20         error("Cannot read NUMA node directory '%s'", dirname);
  21         return 0;
  22     }
  23
  24     struct dirent *de = NULL;
  25     while((de = readdir(dir))) {
  26         if(de->d_type != DT_DIR)
  27             continue;
  28
  29         if(strncmp(de->d_name, "node", 4) != 0)
  30             continue;
  31
  32         if(!isdigit(de->d_name[4]))
  33             continue;
  34
  35         numa_node_count++;
  36
  37         struct node *m = callocz(1, sizeof(struct node));
  38         m->name = strdupz(de->d_name);
  39
  40         struct stat st;
  41
  42         snprintfz(name, FILENAME_MAX, "%s/%s/numastat", dirname, de->d_name);
  43         if(stat(name, &st) == -1) {
  44             freez(m->name);
  45             freez(m);
  46             continue;
  47         }
  48
  49         m->numastat_filename = strdupz(name);
  50
  51         m->next = numa_root;
  52         numa_root = m;
  53     }
  54
  55     closedir(dir);
  56
  57     return numa_node_count;
  58 }
  59
  60 int do_proc_sys_devices_system_node(int update_every, usec_t dt) {
  61     (void)dt;
  62
  63     static int numa_node_count = 0;
  64
  65     if(unlikely(numa_root == NULL)) {
  66         numa_node_count = find_all_nodes(update_every);
  67         if(unlikely(numa_root == NULL))
  68             return 1;
  69     }
  70
  71     static int do_numastat = -1;
  72     struct node *m;
  73
  74     if(unlikely(do_numastat == -1)) {
  75         do_numastat = config_get_boolean_ondemand("plugin:proc:/sys/devices/system/node", "enable per-node numa metrics", CONFIG_BOOLEAN_AUTO);
  76     }
  77
  78     if(do_numastat == CONFIG_BOOLEAN_YES || (do_numastat == CONFIG_BOOLEAN_AUTO && numa_node_count >= 2)) {
  79         for(m = numa_root; m; m = m->next) {
  80             if(m->numastat_filename) {
  81                 if(unlikely(!m->numastat_ff)) {
  82                     m->numastat_ff = procfile_open(m->numastat_filename, " ", PROCFILE_FLAG_DEFAULT);
  83                     if(unlikely(!m->numastat_ff))
  84                         continue;
  85                 }
  86
  87                 m->numastat_ff = procfile_readall(m->numastat_ff);
  88                 if(unlikely(!m->numastat_ff || procfile_lines(m->numastat_ff) < 1 || procfile_linewords(m->numastat_ff, 0) < 1))
  89                     continue;
  90
  91                 procfile *ff = m->numastat_ff;
  92
  93                 RRDSET *st = m->numastat_st;
  94                 if(unlikely(!st)) {
  95                     st = rrdset_create_localhost("mem", m->name, NULL, "numa", NULL, "NUMA events", "events/s", 1000
  96                                                  , update_every, RRDSET_TYPE_LINE);
  97                     rrdset_flag_set(st, RRDSET_FLAG_DETAIL);
  98
  99                     rrddim_add(st, "local_node", "local", 1, 1, RRD_ALGORITHM_INCREMENTAL);
 100                     rrddim_add(st, "numa_foreign", "foreign", 1, 1, RRD_ALGORITHM_INCREMENTAL);
 101                     rrddim_add(st, "interleave_hit", "interleave", 1, 1, RRD_ALGORITHM_INCREMENTAL);
 102                     rrddim_add(st, "other_node", "other", 1, 1, RRD_ALGORITHM_INCREMENTAL);
 103
 104                     m->numastat_st = st;
 105                 }
 106                 else rrdset_next(st);
 107
 108                 uint32_t lines = procfile_lines(ff), l;
 109                 for(l = 0; l < lines; l++) {
 110                     uint32_t words = procfile_linewords(ff, l);
 111                     if(unlikely(words < 2)) {
 112                         if(unlikely(words)) error("Cannot read %s numastat line %u. Expected 2 params, read %u.", m->name, l, words);
 113                         continue;
 114                     }
 115
 116                     char *name = procfile_lineword(ff, l, 0);
 117                     char *value = procfile_lineword(ff, l, 1);
 118                     if (unlikely(!name || !*name || !value || !*value)) continue;
 119
 120                     rrddim_set(st, name, strtoull(value, NULL, 10));
 121                 }
 122                 rrdset_done(st);
 123             }
 124         }
 125     }
 126
 127     return 0;
 128 }