diff options
Diffstat (limited to 'collectors/proc.plugin/proc_softirqs.c')
| -rw-r--r-- | collectors/proc.plugin/proc_softirqs.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/collectors/proc.plugin/proc_softirqs.c b/collectors/proc.plugin/proc_softirqs.c new file mode 100644 index 000000000..d68c69bb7 --- /dev/null +++ b/collectors/proc.plugin/proc_softirqs.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "plugin_proc.h" + +#define PLUGIN_PROC_MODULE_SOFTIRQS_NAME "/proc/softirqs" + +#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)) { + uint32_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_softirqs(int update_every, usec_t dt) { + (void)dt; + static procfile *ff = NULL; + static int cpus = -1, do_per_core = CONFIG_BOOLEAN_INVALID; + struct interrupt *irrs = NULL; + + if(unlikely(do_per_core == CONFIG_BOOLEAN_INVALID)) + do_per_core = config_get_boolean_ondemand("plugin:proc:/proc/softirqs", "interrupts per core", CONFIG_BOOLEAN_AUTO); + + if(unlikely(!ff)) { + char filename[FILENAME_MAX + 1]; + snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/softirqs"); + ff = procfile_open(config_get("plugin:proc:/proc/softirqs", "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/softirqs, 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_SOFTIRQS: Cannot find the number of CPUs in /proc/softirqs"); + 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; + + 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; + } + + strncpyz(irr->name, irr->id, MAX_INTERRUPT_NAME); + + irr->used = 1; + } + + // -------------------------------------------------------------------- + + static RRDSET *st_system_softirqs = NULL; + if(unlikely(!st_system_softirqs)) + st_system_softirqs = rrdset_create_localhost( + "system" + , "softirqs" + , NULL + , "softirqs" + , NULL + , "System softirqs" + , "softirqs/s" + , PLUGIN_PROC_NAME + , PLUGIN_PROC_MODULE_SOFTIRQS_NAME + , NETDATA_CHART_PRIO_SYSTEM_SOFTIRQS + , update_every + , RRDSET_TYPE_STACKED + ); + else + rrdset_next(st_system_softirqs); + + for(l = 0; l < lines ;l++) { + struct interrupt *irr = irrindex(irrs, l, cpus); + + if(irr->used && 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_add(st_system_softirqs, irr->id, irr->name, 1, 1, RRD_ALGORITHM_INCREMENTAL); + rrddim_set_name(st_system_softirqs, irr->rd, irr->name); + + // also reset per cpu RRDDIMs to avoid repeating strncmp() in the per core loop + if(likely(do_per_core != CONFIG_BOOLEAN_NO)) { + int c; + for(c = 0; c < cpus; c++) irr->cpu[c].rd = NULL; + } + } + + rrddim_set_by_pointer(st_system_softirqs, irr->rd, irr->total); + } + } + + rrdset_done(st_system_softirqs); + + // -------------------------------------------------------------------- + + if(do_per_core != CONFIG_BOOLEAN_NO) { + static RRDSET **core_st = NULL; + static int old_cpus = 0; + + if(old_cpus < cpus) { + core_st = reallocz(core_st, sizeof(RRDSET *) * cpus); + memset(&core_st[old_cpus], 0, sizeof(RRDSET *) * (cpus - old_cpus)); + old_cpus = cpus; + } + + int c; + + for(c = 0; c < cpus ; c++) { + if(unlikely(!core_st[c])) { + // find if everything is just zero + unsigned long long core_sum = 0; + + for (l = 0; l < lines; l++) { + struct interrupt *irr = irrindex(irrs, l, cpus); + if (unlikely(!irr->used)) continue; + core_sum += irr->cpu[c].value; + } + + if (unlikely(core_sum == 0)) continue; // try next core + + char id[50 + 1]; + snprintfz(id, 50, "cpu%d_softirqs", c); + + char title[100 + 1]; + snprintfz(title, 100, "CPU%d softirqs", c); + + core_st[c] = rrdset_create_localhost( + "cpu" + , id + , NULL + , "softirqs" + , "cpu.softirqs" + , title + , "softirqs/s" + , PLUGIN_PROC_NAME + , PLUGIN_PROC_MODULE_SOFTIRQS_NAME + , NETDATA_CHART_PRIO_SOFTIRQS_PER_CORE + c + , update_every + , RRDSET_TYPE_STACKED + ); + } + else + rrdset_next(core_st[c]); + + for(l = 0; l < lines ;l++) { + struct interrupt *irr = irrindex(irrs, l, cpus); + + if(irr->used && (do_per_core == CONFIG_BOOLEAN_YES || irr->cpu[c].value)) { + if(unlikely(!irr->cpu[c].rd)) { + irr->cpu[c].rd = rrddim_add(core_st[c], irr->id, irr->name, 1, 1, RRD_ALGORITHM_INCREMENTAL); + rrddim_set_name(core_st[c], irr->cpu[c].rd, irr->name); + } + + rrddim_set_by_pointer(core_st[c], irr->cpu[c].rd, irr->cpu[c].value); + } + } + + rrdset_done(core_st[c]); + } + } + + return 0; +} |