247 lines
7.9 KiB
C
247 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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#include "plugin_proc.h"
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#define PLUGIN_PROC_MODULE_SOFTIRQS_NAME "/proc/softirqs"
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#define MAX_INTERRUPT_NAME 50
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struct cpu_interrupt {
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unsigned long long value;
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RRDDIM *rd;
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};
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struct interrupt {
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int used;
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char *id;
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char name[MAX_INTERRUPT_NAME + 1];
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RRDDIM *rd;
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unsigned long long total;
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struct cpu_interrupt cpu[];
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};
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// since each interrupt is variable in size
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// we use this to calculate its record size
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#define recordsize(cpus) (sizeof(struct interrupt) + ((cpus) * sizeof(struct cpu_interrupt)))
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// given a base, get a pointer to each record
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#define irrindex(base, line, cpus) ((struct interrupt *)&((char *)(base))[(line) * recordsize(cpus)])
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static inline struct interrupt *get_interrupts_array(size_t lines, int cpus) {
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static struct interrupt *irrs = NULL;
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static size_t allocated = 0;
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if(unlikely(lines != allocated)) {
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uint32_t l;
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int c;
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irrs = (struct interrupt *)reallocz(irrs, lines * recordsize(cpus));
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// reset all interrupt RRDDIM pointers as any line could have shifted
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for(l = 0; l < lines ;l++) {
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struct interrupt *irr = irrindex(irrs, l, cpus);
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irr->rd = NULL;
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irr->name[0] = '\0';
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for(c = 0; c < cpus ;c++)
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irr->cpu[c].rd = NULL;
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}
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allocated = lines;
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}
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return irrs;
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}
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int do_proc_softirqs(int update_every, usec_t dt) {
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(void)dt;
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static procfile *ff = NULL;
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static int cpus = -1, do_per_core = CONFIG_BOOLEAN_INVALID;
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struct interrupt *irrs = NULL;
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if(unlikely(do_per_core == CONFIG_BOOLEAN_INVALID))
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do_per_core = config_get_boolean_ondemand("plugin:proc:/proc/softirqs", "interrupts per core", CONFIG_BOOLEAN_AUTO);
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if(unlikely(!ff)) {
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char filename[FILENAME_MAX + 1];
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snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/softirqs");
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ff = procfile_open(config_get("plugin:proc:/proc/softirqs", "filename to monitor", filename), " \t:", PROCFILE_FLAG_DEFAULT);
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if(unlikely(!ff)) return 1;
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}
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ff = procfile_readall(ff);
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if(unlikely(!ff)) return 0; // we return 0, so that we will retry to open it next time
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size_t lines = procfile_lines(ff), l;
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size_t words = procfile_linewords(ff, 0);
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if(unlikely(!lines)) {
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error("Cannot read /proc/softirqs, zero lines reported.");
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return 1;
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}
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// find how many CPUs are there
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if(unlikely(cpus == -1)) {
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uint32_t w;
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cpus = 0;
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for(w = 0; w < words ; w++) {
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if(likely(strncmp(procfile_lineword(ff, 0, w), "CPU", 3) == 0))
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cpus++;
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}
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}
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if(unlikely(!cpus)) {
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error("PLUGIN: PROC_SOFTIRQS: Cannot find the number of CPUs in /proc/softirqs");
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return 1;
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}
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// allocate the size we need;
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irrs = get_interrupts_array(lines, cpus);
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irrs[0].used = 0;
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// loop through all lines
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for(l = 1; l < lines ;l++) {
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struct interrupt *irr = irrindex(irrs, l, cpus);
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irr->used = 0;
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irr->total = 0;
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words = procfile_linewords(ff, l);
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if(unlikely(!words)) continue;
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irr->id = procfile_lineword(ff, l, 0);
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if(unlikely(!irr->id || !irr->id[0])) continue;
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int c;
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for(c = 0; c < cpus ;c++) {
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if(likely((c + 1) < (int)words))
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irr->cpu[c].value = str2ull(procfile_lineword(ff, l, (uint32_t)(c + 1)));
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else
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irr->cpu[c].value = 0;
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irr->total += irr->cpu[c].value;
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}
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strncpyz(irr->name, irr->id, MAX_INTERRUPT_NAME);
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irr->used = 1;
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}
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// --------------------------------------------------------------------
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static RRDSET *st_system_softirqs = NULL;
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if(unlikely(!st_system_softirqs))
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st_system_softirqs = rrdset_create_localhost(
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"system"
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, "softirqs"
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, NULL
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, "softirqs"
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, NULL
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, "System softirqs"
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, "softirqs/s"
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, PLUGIN_PROC_NAME
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, PLUGIN_PROC_MODULE_SOFTIRQS_NAME
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, NETDATA_CHART_PRIO_SYSTEM_SOFTIRQS
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, update_every
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, RRDSET_TYPE_STACKED
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);
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else
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rrdset_next(st_system_softirqs);
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for(l = 0; l < lines ;l++) {
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struct interrupt *irr = irrindex(irrs, l, cpus);
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if(irr->used && irr->total) {
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// some interrupt may have changed without changing the total number of lines
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// if the same number of interrupts have been added and removed between two
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// calls of this function.
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if(unlikely(!irr->rd || strncmp(irr->name, rrddim_name(irr->rd), MAX_INTERRUPT_NAME) != 0)) {
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irr->rd = rrddim_add(st_system_softirqs, irr->id, irr->name, 1, 1, RRD_ALGORITHM_INCREMENTAL);
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rrddim_reset_name(st_system_softirqs, irr->rd, irr->name);
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// also reset per cpu RRDDIMs to avoid repeating strncmp() in the per core loop
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if(likely(do_per_core != CONFIG_BOOLEAN_NO)) {
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int c;
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for(c = 0; c < cpus; c++) irr->cpu[c].rd = NULL;
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}
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}
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rrddim_set_by_pointer(st_system_softirqs, irr->rd, irr->total);
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}
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}
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rrdset_done(st_system_softirqs);
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// --------------------------------------------------------------------
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if(do_per_core != CONFIG_BOOLEAN_NO) {
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static RRDSET **core_st = NULL;
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static int old_cpus = 0;
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if(old_cpus < cpus) {
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core_st = reallocz(core_st, sizeof(RRDSET *) * cpus);
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memset(&core_st[old_cpus], 0, sizeof(RRDSET *) * (cpus - old_cpus));
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old_cpus = cpus;
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}
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int c;
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for(c = 0; c < cpus ; c++) {
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if(unlikely(!core_st[c])) {
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// find if everything is just zero
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unsigned long long core_sum = 0;
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for (l = 0; l < lines; l++) {
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struct interrupt *irr = irrindex(irrs, l, cpus);
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if (unlikely(!irr->used)) continue;
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core_sum += irr->cpu[c].value;
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}
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if (unlikely(core_sum == 0)) continue; // try next core
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char id[50 + 1];
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snprintfz(id, 50, "cpu%d_softirqs", c);
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char title[100 + 1];
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snprintfz(title, 100, "CPU softirqs");
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core_st[c] = rrdset_create_localhost(
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"cpu"
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, id
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, NULL
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, "softirqs"
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, "cpu.softirqs"
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, title
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, "softirqs/s"
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, PLUGIN_PROC_NAME
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, PLUGIN_PROC_MODULE_SOFTIRQS_NAME
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, NETDATA_CHART_PRIO_SOFTIRQS_PER_CORE + c
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, update_every
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, RRDSET_TYPE_STACKED
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);
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char core[50+1];
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snprintfz(core, 50, "cpu%d", c);
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rrdlabels_add(core_st[c]->rrdlabels, "cpu", core, RRDLABEL_SRC_AUTO);
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}
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else
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rrdset_next(core_st[c]);
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for(l = 0; l < lines ;l++) {
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struct interrupt *irr = irrindex(irrs, l, cpus);
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if(irr->used && (do_per_core == CONFIG_BOOLEAN_YES || irr->cpu[c].value)) {
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if(unlikely(!irr->cpu[c].rd)) {
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irr->cpu[c].rd = rrddim_add(core_st[c], irr->id, irr->name, 1, 1, RRD_ALGORITHM_INCREMENTAL);
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rrddim_reset_name(core_st[c], irr->cpu[c].rd, irr->name);
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}
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rrddim_set_by_pointer(core_st[c], irr->cpu[c].rd, irr->cpu[c].value);
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}
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}
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rrdset_done(core_st[c]);
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}
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}
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return 0;
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}
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