Add meminfo collector for FreeBSD.

collector/meminfo_freebsd.go

@@ -0,0 +1,98 @@
+// +build freebsd,!nomeminfo
+
+package collector
+
+import (
+	"errors"
+
+	"github.com/golang/glog"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+/*
+#include <stddef.h>
+#include <sys/sysctl.h>
+
+int _sysctl(const char* name) {
+        int val;
+        size_t size = sizeof(val);
+        int res = sysctlbyname(name, &val, &size, NULL, 0);
+        if (res == -1) {
+                return -1;
+        }
+        if (size != sizeof(val)) {
+                return -2;
+        }
+        return val;
+}
+*/
+import "C"
+
+const (
+	memInfoSubsystem = "memory"
+)
+
+type meminfoCollector struct {
+	config  Config
+	metrics map[string]prometheus.Gauge
+}
+
+func init() {
+	Factories["meminfo"] = NewMeminfoCollector
+}
+
+// Takes a config struct and prometheus registry and returns a new Collector exposing
+// memory stats.
+func NewMeminfoCollector(config Config) (Collector, error) {
+	return &meminfoCollector{
+		config:  config,
+		metrics: map[string]prometheus.Gauge{},
+	}, nil
+}
+
+func (c *meminfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
+	var pages map[string]C.int
+	pages = make(map[string]C.int)
+
+	size := C._sysctl(C.CString("vm.stats.vm.v_page_size"))
+	if size == -1 {
+		return errors.New("sysctl(vm.stats.vm.v_page_size) failed!")
+	}
+	if size == -2 {
+		return errors.New("sysctl(vm.stats.vm.v_page_size) failed, wrong buffer size!")
+	}
+
+	pages["active"] = C._sysctl(C.CString("vm.stats.vm.v_active_count"))
+	pages["inactive"] = C._sysctl(C.CString("vm.stats.vm.v_inactive_count"))
+	pages["wire"] = C._sysctl(C.CString("vm.stats.vm.v_wire_count"))
+	pages["cache"] = C._sysctl(C.CString("vm.stats.vm.v_cache_count"))
+	pages["free"] = C._sysctl(C.CString("vm.stats.vm.v_free_count"))
+	pages["swappgsin"] = C._sysctl(C.CString("vm.stats.vm.v_swappgsin"))
+	pages["swappgsout"] = C._sysctl(C.CString("vm.stats.vm.v_swappgsout"))
+	pages["total"] = C._sysctl(C.CString("vm.stats.vm.v_page_count"))
+
+	for key := range pages {
+		if pages[key] == -1 {
+			return errors.New("sysctl() failed for " + key)
+		}
+		if pages[key] == -2 {
+			return errors.New("sysctl() failed for " + key + ", wrong buffer size!")
+		}
+	}
+
+	glog.V(1).Infof("Set node_mem: %#v", pages)
+	for k, v := range pages {
+		if _, ok := c.metrics[k]; !ok {
+			c.metrics[k] = prometheus.NewGauge(prometheus.GaugeOpts{
+				Namespace: Namespace,
+				Subsystem: memInfoSubsystem,
+				Name:      k,
+				Help:      k + " from sysctl()",
+			})
+		}
+		// Convert metrics to kB ( same as Linux meminfo)
+		c.metrics[k].Set(float64(v * size / 1024))
+		c.metrics[k].Collect(ch)
+	}
+	return err
+}

collector/meminfo_linux_test.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package collector
 
 import (