3 #define MAX_INTERRUPT_NAME 50
8 char name[MAX_INTERRUPT_NAME + 1];
9 unsigned long long total;
10 unsigned long long value[];
13 // since each interrupt is variable in size
14 // we use this to calculate its record size
15 #define recordsize(cpus) (sizeof(struct interrupt) + (cpus * sizeof(unsigned long long)))
17 // given a base, get a pointer to each record
18 #define irrindex(base, line, cpus) ((struct interrupt *)&((char *)(base))[line * recordsize(cpus)])
20 static inline struct interrupt *get_interrupts_array(int lines, int cpus) {
21 static struct interrupt *irrs = NULL;
22 static int allocated = 0;
24 if(unlikely(lines > allocated)) {
25 irrs = (struct interrupt *)reallocz(irrs, lines * recordsize(cpus));
32 int do_proc_interrupts(int update_every, unsigned long long dt) {
35 static procfile *ff = NULL;
36 static int cpus = -1, do_per_core = -1;
37 struct interrupt *irrs = NULL;
39 if(unlikely(do_per_core == -1))
40 do_per_core = config_get_boolean("plugin:proc:/proc/interrupts", "interrupts per core", 1);
43 char filename[FILENAME_MAX + 1];
44 snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/interrupts");
45 ff = procfile_open(config_get("plugin:proc:/proc/interrupts", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
50 ff = procfile_readall(ff);
52 return 0; // we return 0, so that we will retry to open it next time
54 uint32_t lines = procfile_lines(ff), l;
55 uint32_t words = procfile_linewords(ff, 0), w;
57 if(unlikely(!lines)) {
58 error("Cannot read /proc/interrupts, zero lines reported.");
62 // find how many CPUs are there
63 if(unlikely(cpus == -1)) {
65 for(w = 0; w < words ; w++) {
66 if(unlikely(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0))
72 error("PLUGIN: PROC_INTERRUPTS: Cannot find the number of CPUs in /proc/interrupts");
76 // allocate the size we need;
77 irrs = get_interrupts_array(lines, cpus);
80 // loop through all lines
81 for(l = 1; l < lines ;l++) {
82 struct interrupt *irr = irrindex(irrs, l, cpus);
86 words = procfile_linewords(ff, l);
87 if(unlikely(!words)) continue;
89 irr->id = procfile_lineword(ff, l, 0);
90 if(unlikely(!irr->id || !irr->id[0])) continue;
92 int idlen = strlen(irr->id);
93 if(unlikely(irr->id[idlen - 1] == ':'))
94 irr->id[idlen - 1] = '\0';
97 for(c = 0; c < cpus ;c++) {
98 if(unlikely((c + 1) < (int)words))
99 irr->value[c] = strtoull(procfile_lineword(ff, l, (uint32_t)(c + 1)), NULL, 10);
103 irr->total += irr->value[c];
106 if(unlikely(isdigit(irr->id[0]) && (uint32_t)(cpus + 2) < words)) {
107 strncpyz(irr->name, procfile_lineword(ff, l, words - 1), MAX_INTERRUPT_NAME);
108 int nlen = strlen(irr->name);
109 if(unlikely(nlen < (MAX_INTERRUPT_NAME-1))) {
110 irr->name[nlen] = '_';
111 strncpyz(&irr->name[nlen + 1], irr->id, MAX_INTERRUPT_NAME - nlen);
115 strncpyz(irr->name, irr->id, MAX_INTERRUPT_NAME);
123 // --------------------------------------------------------------------
125 st = rrdset_find_bytype("system", "interrupts");
127 st = rrdset_create("system", "interrupts", NULL, "interrupts", NULL, "System interrupts", "interrupts/s", 1000, update_every, RRDSET_TYPE_STACKED);
129 for(l = 0; l < lines ;l++) {
130 struct interrupt *irr = irrindex(irrs, l, cpus);
131 if(unlikely(!irr->used)) continue;
132 rrddim_add(st, irr->id, irr->name, 1, 1, RRDDIM_INCREMENTAL);
135 else rrdset_next(st);
137 for(l = 0; l < lines ;l++) {
138 struct interrupt *irr = irrindex(irrs, l, cpus);
139 if(unlikely(!irr->used)) continue;
140 rrddim_set(st, irr->id, irr->total);
144 if(likely(do_per_core)) {
147 for(c = 0; c < cpus ; c++) {
149 snprintfz(id, 50, "cpu%d_interrupts", c);
151 st = rrdset_find_bytype("cpu", id);
154 snprintfz(title, 100, "CPU%d Interrupts", c);
155 st = rrdset_create("cpu", id, NULL, "interrupts", "cpu.interrupts", title, "interrupts/s", 1100 + c, update_every, RRDSET_TYPE_STACKED);
157 for(l = 0; l < lines ;l++) {
158 struct interrupt *irr = irrindex(irrs, l, cpus);
159 if(unlikely(!irr->used)) continue;
160 rrddim_add(st, irr->id, irr->name, 1, 1, RRDDIM_INCREMENTAL);
163 else rrdset_next(st);
165 for(l = 0; l < lines ;l++) {
166 struct interrupt *irr = irrindex(irrs, l, cpus);
167 if(unlikely(!irr->used)) continue;
168 rrddim_set(st, irr->id, irr->value[c]);