diff options
Diffstat (limited to 'src/proc_interrupts.c')
-rw-r--r-- | src/proc_interrupts.c | 141 |
1 files changed, 89 insertions, 52 deletions
diff --git a/src/proc_interrupts.c b/src/proc_interrupts.c index f277a5a90..f663c0fdd 100644 --- a/src/proc_interrupts.c +++ b/src/proc_interrupts.c @@ -2,70 +2,92 @@ #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(size_t lines, int cpus) { static struct interrupt *irrs = NULL; - static int allocated = 0; + static size_t allocated = 0; + + if(unlikely(lines != allocated)) { + size_t l; + int c; - if(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; } return irrs; } -int do_proc_interrupts(int update_every, unsigned long long dt) { +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(dt) {}; - - if(do_per_core == -1) do_per_core = config_get_boolean("plugin:proc:/proc/interrupts", "interrupts per core", 1); + if(unlikely(do_per_core == -1)) + do_per_core = config_get_boolean("plugin:proc:/proc/interrupts", "interrupts per core", 1); - if(!ff) { + if(unlikely(!ff)) { char filename[FILENAME_MAX + 1]; 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; + if(unlikely(!ff)) + return 1; ff = procfile_readall(ff); - if(!ff) return 0; // we return 0, so that we will retry to open it next time + if(unlikely(!ff)) + return 0; // we return 0, so that we will retry to open it next time - uint32_t lines = procfile_lines(ff), l; - uint32_t words = procfile_linewords(ff, 0), w; + size_t lines = procfile_lines(ff), l; + size_t words = procfile_linewords(ff, 0); - if(!lines) { + if(unlikely(!lines)) { error("Cannot read /proc/interrupts, zero lines reported."); return 1; } // find how many CPUs are there - if(cpus == -1) { + if(unlikely(cpus == -1)) { + uint32_t w; cpus = 0; for(w = 0; w < words ; w++) { - if(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0) + if(likely(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0)) cpus++; } } - if(!cpus) { + if(unlikely(!cpus)) { error("PLUGIN: PROC_INTERRUPTS: Cannot find the number of CPUs in /proc/interrupts"); return 1; } @@ -81,31 +103,36 @@ int do_proc_interrupts(int update_every, unsigned long long dt) { irr->total = 0; words = procfile_linewords(ff, l); - if(!words) continue; + if(unlikely(!words)) continue; irr->id = procfile_lineword(ff, l, 0); - if(!irr->id || !irr->id[0]) continue; + if(unlikely(!irr->id || !irr->id[0])) continue; - int idlen = strlen(irr->id); - if(irr->id[idlen - 1] == ':') + 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((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 = str2ull(procfile_lineword(ff, l, (uint32_t)(c + 1))); else - irr->value[c] = 0; + irr->cpu[c].value = 0; - irr->total += irr->value[c]; + irr->total += irr->cpu[c].value; } - if(isdigit(irr->id[0]) && (uint32_t)(cpus + 2) < words) { + if(unlikely(isdigit(irr->id[0]) && (uint32_t)(cpus + 2) < words)) { strncpyz(irr->name, procfile_lineword(ff, l, words - 1), MAX_INTERRUPT_NAME); - int nlen = strlen(irr->name); - if(nlen < (MAX_INTERRUPT_NAME-1)) { + 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); + 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 { @@ -120,49 +147,59 @@ int do_proc_interrupts(int update_every, unsigned long long dt) { // -------------------------------------------------------------------- st = rrdset_find_bytype("system", "interrupts"); - if(!st) { - st = rrdset_create("system", "interrupts", NULL, "interrupts", NULL, "System interrupts", "interrupts/s", 1000, update_every, RRDSET_TYPE_STACKED); - - for(l = 0; l < lines ;l++) { - struct interrupt *irr = irrindex(irrs, l, cpus); - if(!irr->used) continue; - rrddim_add(st, irr->id, irr->name, 1, 1, RRDDIM_INCREMENTAL); - } - } + if(unlikely(!st)) st = rrdset_create("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(!irr->used) continue; - rrddim_set(st, irr->id, irr->total); + 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, 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) { + if(likely(do_per_core)) { int c; - for(c = 0; c < cpus ; c++) { + for(c = 0; c < cpus ;c++) { char id[50+1]; snprintfz(id, 50, "cpu%d_interrupts", c); st = rrdset_find_bytype("cpu", id); - if(!st) { + if(unlikely(!st)) { char title[100+1]; snprintfz(title, 100, "CPU%d Interrupts", c); st = rrdset_create("cpu", id, NULL, "interrupts", "cpu.interrupts", title, "interrupts/s", 1100 + c, update_every, RRDSET_TYPE_STACKED); - - for(l = 0; l < lines ;l++) { - 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++) { struct interrupt *irr = irrindex(irrs, l, cpus); - if(!irr->used) continue; - rrddim_set(st, irr->id, irr->value[c]); + 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); } |