#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)) { size_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_interrupts(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/interrupts", "interrupts per core", 1); if(unlikely(!ff)) { char filename[FILENAME_MAX + 1]; snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/interrupts"); ff = procfile_open(config_get("plugin:proc:/proc/interrupts", "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/interrupts, 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_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(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; } if(unlikely(isdigit(irr->id[0]) && (uint32_t)(cpus + 2) < words)) { strncpyz(irr->name, procfile_lineword(ff, l, words - 1), MAX_INTERRUPT_NAME); size_t nlen = strlen(irr->name); idlen = strlen(irr->id); if(likely(nlen + 1 + idlen <= MAX_INTERRUPT_NAME)) { irr->name[nlen] = '_'; strncpyz(&irr->name[nlen + 1], irr->id, MAX_INTERRUPT_NAME - nlen - 1); } else { irr->name[MAX_INTERRUPT_NAME - idlen - 1] = '_'; strncpyz(&irr->name[MAX_INTERRUPT_NAME - idlen], irr->id, idlen); } } else { strncpyz(irr->name, irr->id, MAX_INTERRUPT_NAME); } irr->used = 1; } RRDSET *st; // -------------------------------------------------------------------- st = rrdset_find_bytype_localhost("system", "interrupts"); if(unlikely(!st)) st = rrdset_create_localhost("system", "interrupts", NULL, "interrupts", NULL, "System interrupts" , "interrupts/s", 1000, 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->rd->name, irr->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, RRD_ALGORITHM_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(likely(do_per_core)) { int c; for(c = 0; c < cpus ;c++) { char id[50+1]; snprintfz(id, 50, "cpu%d_interrupts", c); st = rrdset_find_bytype_localhost("cpu", id); if(unlikely(!st)) { char title[100+1]; snprintfz(title, 100, "CPU%d Interrupts", c); st = rrdset_create_localhost("cpu", id, NULL, "interrupts", "cpu.interrupts", title, "interrupts/s", 1100 + 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, RRD_ALGORITHM_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; }