diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index 784c3e9..03f026d 100644
--- a/src/backend/commands/vacuumlazy.c
+++ b/src/backend/commands/vacuumlazy.c
@@ -125,6 +125,8 @@ typedef struct LVRelStats
 	bool		lock_waiter_detected;
 } LVRelStats;
 
+/* GUC parameter */
+bool vacuum_even_frozen_page; /* should we scan all pages forcibly? */
 
 /* A few variables that don't seem worth passing around as parameters */
 static int	elevel = -1;
@@ -138,7 +140,7 @@ static BufferAccessStrategy vac_strategy;
 
 /* non-export function prototypes */
 static void lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
-			   Relation *Irel, int nindexes, bool aggressive);
+			   Relation *Irel, int nindexes, bool aggressive, bool scan_all);
 static void lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats);
 static bool lazy_check_needs_freeze(Buffer buf, bool *hastup);
 static void lazy_vacuum_index(Relation indrel,
@@ -246,7 +248,8 @@ lazy_vacuum_rel(Relation onerel, int options, VacuumParams *params,
 	vacrelstats->hasindex = (nindexes > 0);
 
 	/* Do the vacuuming */
-	lazy_scan_heap(onerel, vacrelstats, Irel, nindexes, aggressive);
+	lazy_scan_heap(onerel, vacrelstats, Irel, nindexes, aggressive,
+				   vacuum_even_frozen_page);
 
 	/* Done with indexes */
 	vac_close_indexes(nindexes, Irel, NoLock);
@@ -261,7 +264,7 @@ lazy_vacuum_rel(Relation onerel, int options, VacuumParams *params,
 	if ((vacrelstats->scanned_pages + vacrelstats->frozenskipped_pages)
 		< vacrelstats->rel_pages)
 	{
-		Assert(!aggressive);
+		Assert(!aggressive && !vacuum_even_frozen_page);
 		scanned_all_unfrozen = false;
 	}
 	else
@@ -442,7 +445,7 @@ vacuum_log_cleanup_info(Relation rel, LVRelStats *vacrelstats)
  */
 static void
 lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
-			   Relation *Irel, int nindexes, bool aggressive)
+			   Relation *Irel, int nindexes, bool aggressive, bool scan_all)
 {
 	BlockNumber nblocks,
 				blkno;
@@ -513,6 +516,10 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
 	 * such pages do not need freezing and do not affect the value that we can
 	 * safely set for relfrozenxid or relminmxid.
 	 *
+	 * When scan_all is set, we have to scan all pages forcibly while ignoring
+	 * visibility map status, and then we can safely set for relfrozenxid or
+	 * relminmxid.
+	 *
 	 * Before entering the main loop, establish the invariant that
 	 * next_unskippable_block is the next block number >= blkno that's not we
 	 * can't skip based on the visibility map, either all-visible for a
@@ -639,11 +646,12 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
 			/*
 			 * The current block is potentially skippable; if we've seen a
 			 * long enough run of skippable blocks to justify skipping it, and
-			 * we're not forced to check it, then go ahead and skip.
-			 * Otherwise, the page must be at least all-visible if not
-			 * all-frozen, so we can set all_visible_according_to_vm = true.
+			 * scan_all is not specified, and we're not forced to check it,
+			 * then go ahead and skip. Otherwise, the page must be at least
+			 * all-visible if not all-frozen, so we can set
+			 * all_visible_according_to_vm = true.
 			 */
-			if (skipping_blocks && !FORCE_CHECK_PAGE())
+			if (skipping_blocks && !scan_all && !FORCE_CHECK_PAGE())
 			{
 				/*
 				 * Tricky, tricky.  If this is in aggressive vacuum, the page
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index e246a9c..f86fa68 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1662,6 +1662,16 @@ static struct config_bool ConfigureNamesBool[] =
 		NULL, NULL, NULL
 	},
 
+	{
+		{"vacuum_even_frozen_page", PGC_USERSET, DEVELOPER_OPTIONS,
+			gettext_noop("Do vacuum even frozen page while ignoring visibility map."),
+			NULL
+		},
+		&vacuum_even_frozen_page,
+		false,
+		NULL, NULL, NULL
+	},
+
 	/* End-of-list marker */
 	{
 		{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL, NULL
diff --git a/src/include/commands/vacuum.h b/src/include/commands/vacuum.h
index 80cd4a8..31916dd 100644
--- a/src/include/commands/vacuum.h
+++ b/src/include/commands/vacuum.h
@@ -154,6 +154,7 @@ extern int	vacuum_freeze_min_age;
 extern int	vacuum_freeze_table_age;
 extern int	vacuum_multixact_freeze_min_age;
 extern int	vacuum_multixact_freeze_table_age;
+extern bool	vacuum_even_frozen_page;
 
 
 /* in commands/vacuum.c */