diff options
Diffstat (limited to 'src/proc_softirqs.c')
-rw-r--r-- | src/proc_softirqs.c | 67 |
1 files changed, 37 insertions, 30 deletions
diff --git a/src/proc_softirqs.c b/src/proc_softirqs.c index c3a75f600..96b5d3d30 100644 --- a/src/proc_softirqs.c +++ b/src/proc_softirqs.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; @@ -53,7 +58,7 @@ int do_proc_softirqs(int update_every, unsigned long long dt) { if(!ff) { char filename[FILENAME_MAX + 1]; - snprintf(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/softirqs"); + 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(!ff) return 1; @@ -76,8 +81,6 @@ int do_proc_softirqs(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 +89,12 @@ int do_proc_softirqs(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; @@ -115,8 +118,7 @@ int do_proc_softirqs(int update_every, unsigned long long dt) { irr->total += irr->value[c]; } - 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; } @@ -130,15 +132,17 @@ int do_proc_softirqs(int update_every, unsigned long long dt) { st = rrdset_create("system", "softirqs", NULL, "softirqs", NULL, "System softirqs", "softirqs/s", 950, 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); @@ -146,34 +150,37 @@ int do_proc_softirqs(int update_every, unsigned long long dt) { int c; for(c = 0; c < cpus ; c++) { - char id[256]; - snprintf(id, 256, "cpu%d_softirqs", c); + char id[256+1]; + snprintfz(id, 256, "cpu%d_softirqs", c); st = rrdset_find_bytype("cpu", id); if(!st) { // find if everything is zero unsigned long long core_sum = 0 ; for(l = 0; l < lines ;l++) { - if(!irrs[l].used) continue; - core_sum += irrs[l].value[c]; + struct interrupt *irr = irrindex(irrs, l, cpus); + if(!irr->used) continue; + core_sum += irr->value[c]; } if(core_sum == 0) continue; // try next core - char name[256], title[256]; - snprintf(name, 256, "cpu%d_softirqs", c); - snprintf(title, 256, "CPU%d softirqs", c); + char name[256+1], title[256+1]; + snprintfz(name, 256, "cpu%d_softirqs", c); + snprintfz(title, 256, "CPU%d softirqs", c); st = rrdset_create("cpu", id, name, "softirqs", "cpu.softirqs", title, "softirqs/s", 3000 + 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); } |