diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index e387c01776..e8e15033f8 100644
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -970,6 +970,11 @@ smgrpostcheckpoint(void)
 	}
 }
 
+
+/* TEMPORARY INSTRUMENTATION */
+static int remember_req_cnt = 0;
+
+
 /*
  *	ProcessFsyncRequests() -- Process queued fsync requests.
  */
@@ -991,6 +996,18 @@ ProcessFsyncRequests(void)
 	uint64		longest = 0;
 	uint64		total_elapsed = 0;
 
+
+	/*
+	 * TEMPORARY INSTRUMENTATION
+	 */
+	instr_time	mdsync_start,
+				mdsync_end,
+				mdsync_diff;
+	remember_req_cnt = 0;
+	INSTR_TIME_SET_CURRENT(mdsync_start);
+
+
+
 	/*
 	 * This is only called during checkpoints, and checkpoints should only
 	 * occur in processes that have created a pendingOps.
@@ -1181,6 +1198,19 @@ ProcessFsyncRequests(void)
 
 	/* Flag successful completion of ProcessFsyncRequests */
 	sync_in_progress = false;
+
+
+
+	/*
+	 * TEMPORARY INSTRUMENTATION
+	 */
+	INSTR_TIME_SET_CURRENT(mdsync_end);
+	mdsync_diff = mdsync_end;
+	INSTR_TIME_SUBTRACT(mdsync_diff, mdsync_start);
+	elapsed = INSTR_TIME_GET_MICROSEC(mdsync_diff);
+	if (log_checkpoints)
+		elog(LOG, "debug ProcessFsyncRequests stats: remembered=%d fsynced=%d time=%.3f msec",
+			 remember_req_cnt, processed, (double) elapsed / 1000);
 }
 
 /*
@@ -1207,6 +1237,9 @@ ProcessFsyncRequests(void)
 void
 RememberFsyncRequest(RelFileNode rnode, ForkNumber forknum, SegmentNumber segno)
 {
+	/* TEMPORARY INSTRUMENTATION */
+	remember_req_cnt++;
+
 	Assert(pendingOps);
 
 	if (segno == FORGET_RELATION_FSYNC)