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-rw-r--r--src/proc_interrupts.c69
1 files changed, 36 insertions, 33 deletions
diff --git a/src/proc_interrupts.c b/src/proc_interrupts.c
index 6704ef1a..ad00c202 100644
--- a/src/proc_interrupts.c
+++ b/src/proc_interrupts.c
@@ -13,29 +13,34 @@
#include "plugin_proc.h"
#include "log.h"
-#define MAX_INTERRUPTS 256
-#define MAX_INTERRUPT_CPUS 256
#define MAX_INTERRUPT_NAME 50
struct interrupt {
int used;
char *id;
char name[MAX_INTERRUPT_NAME + 1];
- unsigned long long value[MAX_INTERRUPT_CPUS];
unsigned long long total;
+ unsigned long long value[];
};
-static struct interrupt *alloc_interrupts(int lines) {
+// 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 alloced = 0;
+ static int allocated = 0;
- if(lines < alloced) return irrs;
+ if(lines < allocated) return irrs;
else {
- irrs = (struct interrupt *)realloc(irrs, lines * sizeof(struct interrupt));
+ irrs = (struct interrupt *)realloc(irrs, lines * recordsize(cpus));
if(!irrs)
fatal("Cannot allocate memory for %d interrupts", lines);
- alloced = lines;
+ allocated = lines;
}
return irrs;
@@ -44,7 +49,6 @@ static struct interrupt *alloc_interrupts(int lines) {
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) {};
@@ -53,7 +57,7 @@ int do_proc_interrupts(int update_every, unsigned long long dt) {
if(!ff) {
char filename[FILENAME_MAX + 1];
- snprintf(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/interrupts");
+ 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;
@@ -76,8 +80,6 @@ int do_proc_interrupts(int update_every, unsigned long long dt) {
if(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0)
cpus++;
}
-
- if(cpus > MAX_INTERRUPT_CPUS) cpus = MAX_INTERRUPT_CPUS;
}
if(!cpus) {
@@ -86,12 +88,12 @@ int do_proc_interrupts(int update_every, unsigned long long dt) {
}
// allocate the size we need;
- irrs = alloc_interrupts(lines);
+ irrs = get_interrupts_array(lines, cpus);
irrs[0].used = 0;
// loop through all lines
for(l = 1; l < lines ;l++) {
- struct interrupt *irr = &irrs[l];
+ struct interrupt *irr = irrindex(irrs, l, cpus);
irr->used = 0;
irr->total = 0;
@@ -116,18 +118,15 @@ int do_proc_interrupts(int update_every, unsigned long long dt) {
}
if(isdigit(irr->id[0]) && (uint32_t)(cpus + 2) < words) {
- strncpy(irr->name, procfile_lineword(ff, l, words - 1), MAX_INTERRUPT_NAME);
- irr->name[MAX_INTERRUPT_NAME] = '\0';
+ 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] = '_';
- strncpy(&irr->name[nlen + 1], irr->id, MAX_INTERRUPT_NAME - nlen);
- irr->name[MAX_INTERRUPT_NAME] = '\0';
+ strncpyz(&irr->name[nlen + 1], irr->id, MAX_INTERRUPT_NAME - nlen);
}
}
else {
- strncpy(irr->name, irr->id, MAX_INTERRUPT_NAME);
- irr->name[MAX_INTERRUPT_NAME] = '\0';
+ strncpyz(irr->name, irr->id, MAX_INTERRUPT_NAME);
}
irr->used = 1;
@@ -142,15 +141,17 @@ int do_proc_interrupts(int update_every, unsigned long long dt) {
st = rrdset_create("system", "interrupts", NULL, "interrupts", NULL, "System interrupts", "interrupts/s", 1000, update_every, RRDSET_TYPE_STACKED);
for(l = 0; l < lines ;l++) {
- if(!irrs[l].used) continue;
- rrddim_add(st, irrs[l].id, irrs[l].name, 1, 1, RRDDIM_INCREMENTAL);
+ 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++) {
- if(!irrs[l].used) continue;
- rrddim_set(st, irrs[l].id, irrs[l].total);
+ struct interrupt *irr = irrindex(irrs, l, cpus);
+ if(!irr->used) continue;
+ rrddim_set(st, irr->id, irr->total);
}
rrdset_done(st);
@@ -158,26 +159,28 @@ int do_proc_interrupts(int update_every, unsigned long long dt) {
int c;
for(c = 0; c < cpus ; c++) {
- char id[256];
- snprintf(id, 256, "cpu%d_interrupts", c);
+ char id[256+1];
+ snprintfz(id, 256, "cpu%d_interrupts", c);
st = rrdset_find_bytype("cpu", id);
if(!st) {
- char name[256], title[256];
- snprintf(name, 256, "cpu%d_interrupts", c);
- snprintf(title, 256, "CPU%d Interrupts", c);
+ 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++) {
- if(!irrs[l].used) continue;
- rrddim_add(st, irrs[l].id, irrs[l].name, 1, 1, RRDDIM_INCREMENTAL);
+ 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++) {
- if(!irrs[l].used) continue;
- rrddim_set(st, irrs[l].id, irrs[l].value[c]);
+ struct interrupt *irr = irrindex(irrs, l, cpus);
+ if(!irr->used) continue;
+ rrddim_set(st, irr->id, irr->value[c]);
}
rrdset_done(st);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 18:17:17 +0000