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-rw-r--r--collectors/proc.plugin/proc_softirqs.c242
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 0000000..d68c69b
--- /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;
+}