Adding upstream version 1.12.0.upstream/1.12.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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;
+}