#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;
- unsigned long long value[];
+ 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(unsigned long long)))
+#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(int lines, int cpus) {
+static inline struct interrupt *get_interrupts_array(uint32_t lines, int cpus) {
static struct interrupt *irrs = NULL;
- static int allocated = 0;
+ static uint32_t allocated = 0;
+
+ if(unlikely(lines != allocated)) {
+ uint32_t l;
+ int c;
- if(unlikely(lines > allocated)) {
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;
}
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);
uint32_t w;
cpus = 0;
for(w = 0; w < words ; w++) {
- if(unlikely(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0))
+ if(likely(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0))
cpus++;
}
}
int c;
for(c = 0; c < cpus ;c++) {
- if(unlikely((c + 1) < (int)words))
- irr->value[c] = strtoull(procfile_lineword(ff, l, (uint32_t)(c + 1)), NULL, 10);
+ if(likely((c + 1) < (int)words))
+ irr->cpu[c].value = strtoull(procfile_lineword(ff, l, (uint32_t)(c + 1)), NULL, 10);
else
- irr->value[c] = 0;
+ irr->cpu[c].value = 0;
- irr->total += irr->value[c];
+ irr->total += irr->cpu[c].value;
}
strncpyz(irr->name, irr->id, MAX_INTERRUPT_NAME);
// --------------------------------------------------------------------
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);
-
- for(l = 0; l < lines ;l++) {
- struct interrupt *irr = irrindex(irrs, l, cpus);
- if(unlikely(!irr->used)) continue;
- rrddim_add(st, irr->id, irr->name, 1, 1, RRDDIM_INCREMENTAL);
- }
- }
+ 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;
- rrddim_set(st, irr->id, irr->total);
+ // 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);
for(l = 0; l < lines ;l++) {
struct interrupt *irr = irrindex(irrs, l, cpus);
if(unlikely(!irr->used)) continue;
- core_sum += irr->value[c];
+ 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);
-
- for(l = 0; l < lines ;l++) {
- struct interrupt *irr = irrindex(irrs, l, cpus);
- if(unlikely(!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(unlikely(!irr->used)) continue;
- rrddim_set(st, irr->id, irr->value[c]);
+ 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);
}