prefetch code for support of SERVER-5685

1 files changed, 31 insertions, 0 deletions

diff --git a/src/mongo/db/prefetch.h b/src/mongo/db/prefetch.h
new file mode 100644
index 00000000000..29e5f3871d0
--- /dev/null
+++ b/src/mongo/db/prefetch.h
@@ -0,0 +1,31 @@
+/**
+*    Copyright (C) 2008 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/>.
+*/
+#pragma once
+
+#include "mongo/db/jsobj.h"
+#include "mongo/db/diskloc.h"
+
+namespace mongo {
+    class NamespaceDetails;
+    // page in pages needed for all index lookups on a given object
+    void prefetchIndexPages(const char *ns, const BSONObj& obj);
+
+    // page in the data pages for a record associated with an object
+    void prefetchRecordPages(const char *ns, const BSONObj& obj);
+
+    // page in both index and data pages for an op from the oplog
+    void prefetchPagesForReplicatedOp(const BSONObj& op);
+}