Object-cache: enforce cache size to be less than RAM. (#2338)

pkg/sys/stats_linux.go

@@ -0,0 +1,34 @@
+// +build linux
+
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sys
+
+import "syscall"
+
+// GetStats - return system statistics.
+func GetStats() (stats Stats, err error) {
+	si := syscall.Sysinfo_t{}
+	err = syscall.Sysinfo(&si)
+	if err != nil {
+		return
+	}
+	stats = Stats{
+		TotalRAM: si.Totalram,
+	}
+	return stats, nil
+}