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#include "common.h"
#define MAX_INTERRUPT_NAME 50
struct cpu_interrupt {
unsigned long long value;
RRDDIM *rd;
};
struct interrupt {
int used;
char *id;
char name[MAX_INTERRUPT_NAME + 1];
RRDDIM *rd;
unsigned long long total;
struct cpu_interrupt cpu[];
};
// since each interrupt is variable in size
// we use this to calculate its record size
#define recordsize(cpus) (sizeof(struct interrupt) + (cpus * sizeof(struct cpu_interrupt)))
// 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(size_t lines, int cpus) {
static struct interrupt *irrs = NULL;
static size_t allocated = 0;
if(unlikely(lines != allocated)) {
uint32_t l;
int c;
irrs = (struct interrupt *)reallocz(irrs, lines * recordsize(cpus));
// reset all interrupt RRDDIM pointers as any line could have shifted
for(l = 0; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
irr->rd = NULL;
irr->name[0] = '\0';
for(c = 0; c < cpus ;c++)
irr->cpu[c].rd = NULL;
}
allocated = lines;
}
return irrs;
}
int do_proc_softirqs(int update_every, usec_t dt) {
(void)dt;
static procfile *ff = NULL;
static int cpus = -1, do_per_core = -1;
struct interrupt *irrs = NULL;
if(unlikely(do_per_core == -1)) do_per_core = config_get_boolean("plugin:proc:/proc/softirqs", "interrupts per core", 1);
if(unlikely(!ff)) {
char filename[FILENAME_MAX + 1];
snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/softirqs");
ff = procfile_open(config_get("plugin:proc:/proc/softirqs", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
if(unlikely(!ff)) return 1;
}
ff = procfile_readall(ff);
if(unlikely(!ff)) return 0; // we return 0, so that we will retry to open it next time
size_t lines = procfile_lines(ff), l;
size_t words = procfile_linewords(ff, 0);
if(unlikely(!lines)) {
error("Cannot read /proc/softirqs, zero lines reported.");
return 1;
}
// find how many CPUs are there
if(unlikely(cpus == -1)) {
uint32_t w;
cpus = 0;
for(w = 0; w < words ; w++) {
if(likely(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0))
cpus++;
}
}
if(unlikely(!cpus)) {
error("PLUGIN: PROC_SOFTIRQS: Cannot find the number of CPUs in /proc/softirqs");
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(unlikely(!words)) continue;
irr->id = procfile_lineword(ff, l, 0);
if(unlikely(!irr->id || !irr->id[0])) continue;
size_t idlen = strlen(irr->id);
if(unlikely(idlen && irr->id[idlen - 1] == ':'))
irr->id[idlen - 1] = '\0';
int c;
for(c = 0; c < cpus ;c++) {
if(likely((c + 1) < (int)words))
irr->cpu[c].value = str2ull(procfile_lineword(ff, l, (uint32_t)(c + 1)));
else
irr->cpu[c].value = 0;
irr->total += irr->cpu[c].value;
}
strncpyz(irr->name, irr->id, MAX_INTERRUPT_NAME);
irr->used = 1;
}
RRDSET *st;
// --------------------------------------------------------------------
st = rrdset_find_bytype("system", "softirqs");
if(unlikely(!st)) st = rrdset_create("system", "softirqs", NULL, "softirqs", NULL, "System softirqs", "softirqs/s", 950, update_every, RRDSET_TYPE_STACKED);
else rrdset_next(st);
for(l = 0; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
if(unlikely(!irr->used)) continue;
// some interrupt may have changed without changing the total number of lines
// if the same number of interrupts have been added and removed between two
// calls of this function.
if(unlikely(!irr->rd || strncmp(irr->name, irr->rd->name, MAX_INTERRUPT_NAME) != 0)) {
irr->rd = rrddim_find(st, irr->id);
if(unlikely(!irr->rd))
irr->rd = rrddim_add(st, irr->id, irr->name, 1, 1, RRDDIM_INCREMENTAL);
else
rrddim_set_name(st, irr->rd, irr->name);
// also reset per cpu RRDDIMs to avoid repeating strncmp() in the per core loop
if(likely(do_per_core)) {
int c;
for (c = 0; c < cpus ;c++)
irr->cpu[c].rd = NULL;
}
}
rrddim_set_by_pointer(st, irr->rd, irr->total);
}
rrdset_done(st);
if(do_per_core) {
int c;
for(c = 0; c < cpus ; c++) {
char id[50+1];
snprintfz(id, 50, "cpu%d_softirqs", c);
st = rrdset_find_bytype("cpu", id);
if(unlikely(!st)) {
// find if everything is zero
unsigned long long core_sum = 0 ;
for(l = 0; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
if(unlikely(!irr->used)) continue;
core_sum += irr->cpu[c].value;
}
if(unlikely(core_sum == 0)) continue; // try next core
char title[100+1];
snprintfz(title, 100, "CPU%d softirqs", c);
st = rrdset_create("cpu", id, NULL, "softirqs", "cpu.softirqs", title, "softirqs/s", 3000 + c, update_every, RRDSET_TYPE_STACKED);
}
else rrdset_next(st);
for(l = 0; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
if(unlikely(!irr->used)) continue;
if(unlikely(!irr->cpu[c].rd)) {
irr->cpu[c].rd = rrddim_find(st, irr->id);
if(unlikely(!irr->cpu[c].rd))
irr->cpu[c].rd = rrddim_add(st, irr->id, irr->name, 1, 1, RRDDIM_INCREMENTAL);
else
rrddim_set_name(st, irr->cpu[c].rd, irr->name);
}
rrddim_set_by_pointer(st, irr->cpu[c].rd, irr->cpu[c].value);
}
rrdset_done(st);
}
}
return 0;
}
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