1 files changed, 124 insertions, 0 deletions
diff --git a/collectors/proc.plugin/proc_loadavg.c b/collectors/proc.plugin/proc_loadavg.c
new file mode 100644
index 0000000..db95b16
--- /dev/null
+++ b/collectors/proc.plugin/proc_loadavg.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "plugin_proc.h"
+
+#define PLUGIN_PROC_MODULE_LOADAVG_NAME "/proc/loadavg"
+#define CONFIG_SECTION_PLUGIN_PROC_LOADAVG "plugin:" PLUGIN_PROC_CONFIG_NAME ":" PLUGIN_PROC_MODULE_LOADAVG_NAME
+
+// linux calculates this once every 5 seconds
+#define MIN_LOADAVG_UPDATE_EVERY 5
+
+int do_proc_loadavg(int update_every, usec_t dt) {
+    static procfile *ff = NULL;
+    static int do_loadavg = -1, do_all_processes = -1;
+    static usec_t next_loadavg_dt = 0;
+
+    if(unlikely(!ff)) {
+        char filename[FILENAME_MAX + 1];
+        snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/loadavg");
+
+        ff = procfile_open(config_get(CONFIG_SECTION_PLUGIN_PROC_LOADAVG, "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
+
+    if(unlikely(do_loadavg == -1)) {
+        do_loadavg          = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_LOADAVG, "enable load average", 1);
+        do_all_processes    = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_LOADAVG, "enable total processes", 1);
+    }
+
+    if(unlikely(procfile_lines(ff) < 1)) {
+        error("/proc/loadavg has no lines.");
+        return 1;
+    }
+    if(unlikely(procfile_linewords(ff, 0) < 6)) {
+        error("/proc/loadavg has less than 6 words in it.");
+        return 1;
+    }
+
+    double load1 = strtod(procfile_lineword(ff, 0, 0), NULL);
+    double load5 = strtod(procfile_lineword(ff, 0, 1), NULL);
+    double load15 = strtod(procfile_lineword(ff, 0, 2), NULL);
+
+    //unsigned long long running_processes  = str2ull(procfile_lineword(ff, 0, 3));
+    unsigned long long active_processes     = str2ull(procfile_lineword(ff, 0, 4));
+    //unsigned long long next_pid           = str2ull(procfile_lineword(ff, 0, 5));
+
+
+    // --------------------------------------------------------------------
+
+    if(next_loadavg_dt <= dt) {
+        if(likely(do_loadavg)) {
+            static RRDSET *load_chart = NULL;
+            static RRDDIM *rd_load1 = NULL, *rd_load5 = NULL, *rd_load15 = NULL;
+
+            if(unlikely(!load_chart)) {
+                load_chart = rrdset_create_localhost(
+                        "system"
+                        , "load"
+                        , NULL
+                        , "load"
+                        , NULL
+                        , "System Load Average"
+                        , "load"
+                        , PLUGIN_PROC_NAME
+                        , PLUGIN_PROC_MODULE_LOADAVG_NAME
+                        , NETDATA_CHART_PRIO_SYSTEM_LOAD
+                        , (update_every < MIN_LOADAVG_UPDATE_EVERY) ? MIN_LOADAVG_UPDATE_EVERY : update_every
+                        , RRDSET_TYPE_LINE
+                );
+
+                rd_load1  = rrddim_add(load_chart, "load1",  NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
+                rd_load5  = rrddim_add(load_chart, "load5",  NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
+                rd_load15 = rrddim_add(load_chart, "load15", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
+            }
+            else
+                rrdset_next(load_chart);
+
+            rrddim_set_by_pointer(load_chart, rd_load1, (collected_number) (load1 * 1000));
+            rrddim_set_by_pointer(load_chart, rd_load5, (collected_number) (load5 * 1000));
+            rrddim_set_by_pointer(load_chart, rd_load15, (collected_number) (load15 * 1000));
+            rrdset_done(load_chart);
+
+            next_loadavg_dt = load_chart->update_every * USEC_PER_SEC;
+        }
+        else next_loadavg_dt =  MIN_LOADAVG_UPDATE_EVERY * USEC_PER_SEC;
+    }
+    else next_loadavg_dt -= dt;
+
+    // --------------------------------------------------------------------
+
+    if(likely(do_all_processes)) {
+        static RRDSET *processes_chart = NULL;
+        static RRDDIM *rd_active = NULL;
+
+        if(unlikely(!processes_chart)) {
+            processes_chart = rrdset_create_localhost(
+                    "system"
+                    , "active_processes"
+                    , NULL
+                    , "processes"
+                    , NULL
+                    , "System Active Processes"
+                    , "processes"
+                    , PLUGIN_PROC_NAME
+                    , PLUGIN_PROC_MODULE_LOADAVG_NAME
+                    , NETDATA_CHART_PRIO_SYSTEM_ACTIVE_PROCESSES
+                    , update_every
+                    , RRDSET_TYPE_LINE
+            );
+
+            rd_active = rrddim_add(processes_chart, "active", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+        }
+        else rrdset_next(processes_chart);
+
+        rrddim_set_by_pointer(processes_chart, rd_active, active_processes);
+        rrdset_done(processes_chart);
+    }
+
+    return 0;
+}