1 files changed, 47 insertions, 0 deletions
diff --git a/src/mongo/util/systeminfo_linux2.cpp b/src/mongo/util/systeminfo_linux2.cpp
new file mode 100755
index 00000000000..c1b7c861768
--- /dev/null
+++ b/src/mongo/util/systeminfo_linux2.cpp
@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2011 10gen Inc.
+ *
+ * This program is free software: you can redistribute it and/or  modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "pch.h"
+#include "util/systeminfo.h"
+
+#include <unistd.h>
+
+namespace mongo {
+
+    size_t SystemInfo::getPhysicalRam() {
+	/*
+	  The value of this should not be changing while the system is running,
+	  so it should be safe to do this once for the lifetime of the
+	  application.
+
+	  This could present a race condition if multiple threads do this at
+	  the same time, but all paths through here will produce the same
+	  result, so it's not worth locking or worrying about it.
+	 */
+	static bool unknown = true;
+	static size_t ramSize = 0;
+
+	if (unknown) {
+	    long pages = sysconf(_SC_PHYS_PAGES);
+	    long page_size = sysconf(_SC_PAGE_SIZE);
+	    ramSize = pages * page_size;
+	    unknown = false;
+	}
+
+	return ramSize;
+    }
+
+}