OSS changes from ent fix for openbsd memory lookups. (#11088)

helper/hostutil/hostinfo.go

@@ -88,3 +88,17 @@ func CollectHostInfo(ctx context.Context) (*HostInfo, error) {
 
 	return info, retErr.ErrorOrNil()
 }
+
+func CollectHostMemory(ctx context.Context) (*VirtualMemoryStat, error) {
+	m, err := mem.VirtualMemoryWithContext(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return &VirtualMemoryStat{
+		Total:       m.Total,
+		Available:   m.Available,
+		Used:        m.Used,
+		UsedPercent: m.UsedPercent,
+	}, nil
+}

helper/hostutil/hostinfo_openbsd.go

@@ -20,3 +20,7 @@ type HostInfo struct {
 func CollectHostInfo(ctx context.Context) (*HostInfo, error) {
 	return nil, fmt.Errorf("host info not supported on this platform")
 }
+
+func CollectHostMemory(ctx context.Context) (*VirtualMemoryStat, error) {
+	return nil, fmt.Errorf("host info not supported on this platform")
+}

helper/hostutil/hostinfo_util.go

@@ -0,0 +1,24 @@
+package hostutil
+
+// VirutalMemoryStat holds commonly used memory measurements. We must have a
+// local type here in order to avoid building the gopsutil library on certain
+// arch types.
+type VirtualMemoryStat struct {
+	// Total amount of RAM on this system
+	Total uint64
+
+	// RAM available for programs to allocate
+	//
+	// This value is computed from the kernel specific values.
+	Available uint64
+
+	// RAM used by programs
+	//
+	// This value is computed from the kernel specific values.
+	Used uint64
+
+	// Percentage of RAM used by programs
+	//
+	// This value is computed from the kernel specific values.
+	UsedPercent float64
+}