1 files changed, 10 insertions, 3 deletions
diff --git a/src/include/access/hio.h b/src/include/access/hio.h
index 228433ee4a2..9bc563b7628 100644
--- a/src/include/access/hio.h
+++ b/src/include/access/hio.h
@@ -32,15 +32,22 @@ typedef struct BulkInsertStateData
 	Buffer		current_buf;	/* current insertion target page */
 
 	/*
-	 * State for bulk extensions. Further pages that were unused at the time
-	 * of the extension. They might be in use by the time we use them though,
-	 * so rechecks are needed.
+	 * State for bulk extensions.
+	 *
+	 * last_free..next_free are further pages that were unused at the time of
+	 * the last extension. They might be in use by the time we use them
+	 * though, so rechecks are needed.
 	 *
 	 * XXX: Eventually these should probably live in RelationData instead,
 	 * alongside targetblock.
+	 *
+	 * already_extended_by is the number of pages that this bulk inserted
+	 * extended by. If we already extended by a significant number of pages,
+	 * we can be more aggressive about extending going forward.
 	 */
 	BlockNumber next_free;
 	BlockNumber last_free;
+	uint32		already_extended_by;
 } BulkInsertStateData;