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#include "common.h"
#define MAX_INTERRUPT_NAME 50
struct interrupt {
int used;
char *id;
char name[MAX_INTERRUPT_NAME + 1];
unsigned long long total;
unsigned long long value[];
};
// since each interrupt is variable in size
// we use this to calculate its record size
#define recordsize(cpus) (sizeof(struct interrupt) + (cpus * sizeof(unsigned long long)))
// given a base, get a pointer to each record
#define irrindex(base, line, cpus) ((struct interrupt *)&((char *)(base))[line * recordsize(cpus)])
static inline struct interrupt *get_interrupts_array(int lines, int cpus) {
static struct interrupt *irrs = NULL;
static int allocated = 0;
if(lines < allocated) return irrs;
else {
irrs = (struct interrupt *)reallocz(irrs, lines * recordsize(cpus));
allocated = lines;
}
return irrs;
}
int do_proc_interrupts(int update_every, unsigned long long dt) {
static procfile *ff = NULL;
static int cpus = -1, do_per_core = -1;
struct interrupt *irrs = NULL;
if(dt) {};
if(do_per_core == -1) do_per_core = config_get_boolean("plugin:proc:/proc/interrupts", "interrupts per core", 1);
if(!ff) {
char filename[FILENAME_MAX + 1];
snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/interrupts");
ff = procfile_open(config_get("plugin:proc:/proc/interrupts", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
}
if(!ff) return 1;
ff = procfile_readall(ff);
if(!ff) return 0; // we return 0, so that we will retry to open it next time
uint32_t lines = procfile_lines(ff), l;
uint32_t words = procfile_linewords(ff, 0), w;
if(!lines) {
error("Cannot read /proc/interrupts, zero lines reported.");
return 1;
}
// find how many CPUs are there
if(cpus == -1) {
cpus = 0;
for(w = 0; w < words ; w++) {
if(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0)
cpus++;
}
}
if(!cpus) {
error("PLUGIN: PROC_INTERRUPTS: Cannot find the number of CPUs in /proc/interrupts");
return 1;
}
// allocate the size we need;
irrs = get_interrupts_array(lines, cpus);
irrs[0].used = 0;
// loop through all lines
for(l = 1; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
irr->used = 0;
irr->total = 0;
words = procfile_linewords(ff, l);
if(!words) continue;
irr->id = procfile_lineword(ff, l, 0);
if(!irr->id || !irr->id[0]) continue;
int idlen = strlen(irr->id);
if(irr->id[idlen - 1] == ':')
irr->id[idlen - 1] = '\0';
int c;
for(c = 0; c < cpus ;c++) {
if((c + 1) < (int)words)
irr->value[c] = strtoull(procfile_lineword(ff, l, (uint32_t)(c + 1)), NULL, 10);
else
irr->value[c] = 0;
irr->total += irr->value[c];
}
if(isdigit(irr->id[0]) && (uint32_t)(cpus + 2) < words) {
strncpyz(irr->name, procfile_lineword(ff, l, words - 1), MAX_INTERRUPT_NAME);
int nlen = strlen(irr->name);
if(nlen < (MAX_INTERRUPT_NAME-1)) {
irr->name[nlen] = '_';
strncpyz(&irr->name[nlen + 1], irr->id, MAX_INTERRUPT_NAME - nlen);
}
}
else {
strncpyz(irr->name, irr->id, MAX_INTERRUPT_NAME);
}
irr->used = 1;
}
RRDSET *st;
// --------------------------------------------------------------------
st = rrdset_find_bytype("system", "interrupts");
if(!st) {
st = rrdset_create("system", "interrupts", NULL, "interrupts", NULL, "System interrupts", "interrupts/s", 1000, update_every, RRDSET_TYPE_STACKED);
for(l = 0; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
if(!irr->used) continue;
rrddim_add(st, irr->id, irr->name, 1, 1, RRDDIM_INCREMENTAL);
}
}
else rrdset_next(st);
for(l = 0; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
if(!irr->used) continue;
rrddim_set(st, irr->id, irr->total);
}
rrdset_done(st);
if(do_per_core) {
int c;
for(c = 0; c < cpus ; c++) {
char id[256+1];
snprintfz(id, 256, "cpu%d_interrupts", c);
st = rrdset_find_bytype("cpu", id);
if(!st) {
char name[256+1], title[256+1];
snprintfz(name, 256, "cpu%d_interrupts", c);
snprintfz(title, 256, "CPU%d Interrupts", c);
st = rrdset_create("cpu", id, name, "interrupts", "cpu.interrupts", title, "interrupts/s", 2000 + c, update_every, RRDSET_TYPE_STACKED);
for(l = 0; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
if(!irr->used) continue;
rrddim_add(st, irr->id, irr->name, 1, 1, RRDDIM_INCREMENTAL);
}
}
else rrdset_next(st);
for(l = 0; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
if(!irr->used) continue;
rrddim_set(st, irr->id, irr->value[c]);
}
rrdset_done(st);
}
}
return 0;
}
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