diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
new file mode 100644
index c5732c3..a13f243
*** a/src/backend/access/gin/ginfast.c
--- b/src/backend/access/gin/ginfast.c
***************
*** 24,29 ****
--- 24,30 ----
  #include "miscadmin.h"
  #include "utils/memutils.h"
  #include "utils/rel.h"
+ #include "storage/indexfsm.h"
  
  /* GUC parameter */
  int			gin_pending_list_limit = 0;
*************** shiftList(Relation index, Buffer metabuf
*** 521,530 ****
--- 522,533 ----
  		int64		nDeletedHeapTuples = 0;
  		ginxlogDeleteListPages data;
  		Buffer		buffers[GIN_NDELETE_AT_ONCE];
+ 		BlockNumber	freespace[GIN_NDELETE_AT_ONCE];
  
  		data.ndeleted = 0;
  		while (data.ndeleted < GIN_NDELETE_AT_ONCE && blknoToDelete != newHead)
  		{
+ 			freespace[data.ndeleted] = blknoToDelete;
  			buffers[data.ndeleted] = ReadBuffer(index, blknoToDelete);
  			LockBuffer(buffers[data.ndeleted], GIN_EXCLUSIVE);
  			page = BufferGetPage(buffers[data.ndeleted]);
*************** shiftList(Relation index, Buffer metabuf
*** 609,614 ****
--- 612,621 ----
  			UnlockReleaseBuffer(buffers[i]);
  
  		END_CRIT_SECTION();
+ 
+ 		for (i = 0; i < data.ndeleted; i++)
+ 			RecordFreeIndexPage(index, freespace[i]);
+ 
  	} while (blknoToDelete != newHead);
  
  	return false;
*************** ginInsertCleanup(GinState *ginstate,
*** 744,749 ****
--- 751,757 ----
  	BuildAccumulator accum;
  	KeyArray	datums;
  	BlockNumber blkno;
+ 	bool		fsm_vac = false;
  
  	metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
  	LockBuffer(metabuffer, GIN_SHARE);
*************** ginInsertCleanup(GinState *ginstate,
*** 793,798 ****
--- 801,807 ----
  		{
  			/* another cleanup process is running concurrently */
  			UnlockReleaseBuffer(buffer);
+ 			fsm_vac = false;
  			break;
  		}
  
*************** ginInsertCleanup(GinState *ginstate,
*** 857,862 ****
--- 866,872 ----
  				/* another cleanup process is running concurrently */
  				UnlockReleaseBuffer(buffer);
  				LockBuffer(metabuffer, GIN_UNLOCK);
+ 				fsm_vac = false;
  				break;
  			}
  
*************** ginInsertCleanup(GinState *ginstate,
*** 895,903 ****
--- 905,917 ----
  			{
  				/* another cleanup process is running concurrently */
  				LockBuffer(metabuffer, GIN_UNLOCK);
+ 				fsm_vac = false;
  				break;
  			}
  
+ 			/* At this point, some pending pages have been freed up */
+ 			fsm_vac=true;
+ 
  			Assert(blkno == metadata->head);
  			LockBuffer(metabuffer, GIN_UNLOCK);
  
*************** ginInsertCleanup(GinState *ginstate,
*** 931,936 ****
--- 945,959 ----
  
  	ReleaseBuffer(metabuffer);
  
+     /*
+      * As pending list pages can have a high churn rate, it is 
+      * desirable to recycle them immediately to the FreeSpace Map when 
+      * ordinary backends clean the list.
+      */
+ 	if (fsm_vac && !vac_delay)
+ 		IndexFreeSpaceMapVacuum(index);
+ 
+ 
  	/* Clean up temporary space */
  	MemoryContextSwitchTo(oldCtx);
  	MemoryContextDelete(opCtx);