diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
new file mode 100644
index 70d2570..f5c6f9a
*** a/src/backend/access/transam/xlog.c
--- b/src/backend/access/transam/xlog.c
*************** XLogSetAsyncXactLSN(XLogRecPtr asyncXact
*** 2609,2614 ****
--- 2609,2615 ----
  {
  	XLogRecPtr	WriteRqstPtr = asyncXactLSN;
  	bool		sleeping;
+ 	static XLogRecPtr	last_woke = 0;
  
  	SpinLockAcquire(&XLogCtl->info_lck);
  	LogwrtResult = XLogCtl->LogwrtResult;
*************** XLogSetAsyncXactLSN(XLogRecPtr asyncXact
*** 2630,2635 ****
--- 2631,2642 ----
  		/* if we have already flushed that far, we're done */
  		if (WriteRqstPtr <= LogwrtResult.Flush)
  			return;
+ 
+ 		/* If we have already woken up the WALWriter for this boundary, we're done */
+ 		if (WriteRqstPtr <= last_woke)
+ 			return;
+  
+ 		last_woke=WriteRqstPtr;
  	}
  
  	/*