diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index 1d9509a2f6..40ae638f25 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -947,6 +947,18 @@ postgres   27093  0.0  0.0  30096  2752 ?        Ss   11:34   0:00 postgres: ser
      </para></entry>
     </row>
 
+    <row>
+     <entry role="catalog_table_entry"><para role="column_definition">
+      <structfield>backend_mem_allocated</structfield> <type>bigint</type>
+     </para>
+     <para>
+      The byte count of memory allocated to this backend. Dynamic shared memory
+      allocations are included only in the value displayed for the backend that
+      created them, they are not included in the value for backends that are
+      attached to them to avoid double counting.
+     </para></entry>
+    </row>
+
      <row>
       <entry role="catalog_table_entry"><para role="column_definition">
        <structfield>query</structfield> <type>text</type>
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index 5a844b63a1..d23f0e9dbb 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -863,6 +863,7 @@ CREATE VIEW pg_stat_activity AS
             S.backend_xid,
             s.backend_xmin,
             S.query_id,
+            S.backend_mem_allocated,
             S.query,
             S.backend_type
     FROM pg_stat_get_activity(NULL) AS S
diff --git a/src/backend/storage/ipc/dsm_impl.c b/src/backend/storage/ipc/dsm_impl.c
index e1b90c5de4..269ad2fe53 100644
--- a/src/backend/storage/ipc/dsm_impl.c
+++ b/src/backend/storage/ipc/dsm_impl.c
@@ -66,6 +66,7 @@
 #include "postmaster/postmaster.h"
 #include "storage/dsm_impl.h"
 #include "storage/fd.h"
+#include "utils/backend_status.h"
 #include "utils/guc.h"
 #include "utils/memutils.h"
 
@@ -232,6 +233,13 @@ dsm_impl_posix(dsm_op op, dsm_handle handle, Size request_size,
 							name)));
 			return false;
 		}
+		/*
+		 * Detach and destroy pass through here, only decrease the memory
+		 * shown allocated in pgstat_activity when the creator destroys the
+		 * allocation.
+		 */
+		if (op == DSM_OP_DESTROY)
+			pgstat_report_backend_mem_allocated_decrease(*mapped_size);
 		*mapped_address = NULL;
 		*mapped_size = 0;
 		if (op == DSM_OP_DESTROY && shm_unlink(name) != 0)
@@ -332,6 +340,36 @@ dsm_impl_posix(dsm_op op, dsm_handle handle, Size request_size,
 						name)));
 		return false;
 	}
+
+	/*
+	 * Attach and create pass through here, only update backend memory
+	 * allocated in pgstat_activity for the creator process.
+	 */
+	if (op == DSM_OP_CREATE)
+	{
+		/*
+		 * Posix creation calls dsm_impl_posix_resize implying that resizing
+		 * occurs or may be added in the future. As implemented
+		 * dsm_impl_posix_resize utilizes fallocate or truncate, passing the
+		 * whole new size as input, growing the allocation as needed * (only
+		 * truncate supports shrinking). We update by replacing the * old
+		 * allocation with the new.
+		 */
+#if defined(HAVE_POSIX_FALLOCATE) && defined(__linux__)
+		/*
+		 * posix_fallocate does not shrink allocations, adjust only on
+		 * allocation increase.
+		 */
+		if (request_size > *mapped_size)
+		{
+			pgstat_report_backend_mem_allocated_decrease(*mapped_size);
+			pgstat_report_backend_mem_allocated_increase(request_size);
+		}
+#else
+		pgstat_report_backend_mem_allocated_decrease(*mapped_size);
+		pgstat_report_backend_mem_allocated_increase(request_size);
+#endif
+	}
 	*mapped_address = address;
 	*mapped_size = request_size;
 	close(fd);
@@ -537,6 +575,14 @@ dsm_impl_sysv(dsm_op op, dsm_handle handle, Size request_size,
 							name)));
 			return false;
 		}
+
+		/*
+		 * Detach and destroy pass through here, only decrease the memory
+		 * shown allocated in pgstat_activity when the creator destroys the
+		 * allocation.
+		 */
+		if (op == DSM_OP_DESTROY)
+			pgstat_report_backend_mem_allocated_decrease(*mapped_size);
 		*mapped_address = NULL;
 		*mapped_size = 0;
 		if (op == DSM_OP_DESTROY && shmctl(ident, IPC_RMID, NULL) < 0)
@@ -584,6 +630,13 @@ dsm_impl_sysv(dsm_op op, dsm_handle handle, Size request_size,
 						name)));
 		return false;
 	}
+
+	/*
+	 * Attach and create pass through here, only update backend memory
+	 * allocated in pgstat_activity for the creator process.
+	 */
+	if (op == DSM_OP_CREATE)
+		pgstat_report_backend_mem_allocated_increase(request_size);
 	*mapped_address = address;
 	*mapped_size = request_size;
 
@@ -652,6 +705,13 @@ dsm_impl_windows(dsm_op op, dsm_handle handle, Size request_size,
 			return false;
 		}
 
+		/*
+		 * Detach and destroy pass through here, only decrease the memory
+		 * shown allocated in pgstat_activity when the creator destroys the
+		 * allocation.
+		 */
+		if (op == DSM_OP_DESTROY)
+			pgstat_report_backend_mem_allocated_decrease(*mapped_size);
 		*impl_private = NULL;
 		*mapped_address = NULL;
 		*mapped_size = 0;
@@ -768,6 +828,12 @@ dsm_impl_windows(dsm_op op, dsm_handle handle, Size request_size,
 		return false;
 	}
 
+	/*
+	 * Attach and create pass through here, only update backend memory
+	 * allocated in pgstat_activity for the creator process.
+	 */
+	if (op == DSM_OP_CREATE)
+		pgstat_report_backend_mem_allocated_increase(info.RegionSize);
 	*mapped_address = address;
 	*mapped_size = info.RegionSize;
 	*impl_private = hmap;
@@ -812,6 +878,13 @@ dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
 							name)));
 			return false;
 		}
+
+		/*
+		 * Detach and destroy pass through here, only decrease the memory
+		 * shown allocated in pgstat_activity when the creator destroys the
+		 * allocation.
+		 */
+		pgstat_report_backend_mem_allocated_decrease(*mapped_size);
 		*mapped_address = NULL;
 		*mapped_size = 0;
 		if (op == DSM_OP_DESTROY && unlink(name) != 0)
@@ -933,6 +1006,13 @@ dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
 						name)));
 		return false;
 	}
+
+	/*
+	 * Attach and create pass through here, only update backend memory
+	 * allocated in pgstat_activity for the creator process.
+	 */
+	if (op == DSM_OP_CREATE)
+		pgstat_report_backend_mem_allocated_increase(request_size);
 	*mapped_address = address;
 	*mapped_size = request_size;
 
diff --git a/src/backend/utils/activity/backend_status.c b/src/backend/utils/activity/backend_status.c
index c7ed1e6d7a..17a00587f8 100644
--- a/src/backend/utils/activity/backend_status.c
+++ b/src/backend/utils/activity/backend_status.c
@@ -49,6 +49,8 @@ int			pgstat_track_activity_query_size = 1024;
 /* exposed so that backend_progress.c can access it */
 PgBackendStatus *MyBEEntry = NULL;
 
+/* Memory allocated to this backend prior to pgstats initialization */
+uint64		backend_mem_allocated = 0;
 
 static PgBackendStatus *BackendStatusArray = NULL;
 static char *BackendAppnameBuffer = NULL;
@@ -400,6 +402,13 @@ pgstat_bestart(void)
 	lbeentry.st_progress_command_target = InvalidOid;
 	lbeentry.st_query_id = UINT64CONST(0);
 
+	/*
+	 * Move sum of memory allocated prior to pgstats initialization to pgstats
+	 * and zero the local variable.
+	 */
+	lbeentry.backend_mem_allocated = backend_mem_allocated;
+	backend_mem_allocated = 0;
+
 	/*
 	 * we don't zero st_progress_param here to save cycles; nobody should
 	 * examine it until st_progress_command has been set to something other
@@ -1148,3 +1157,99 @@ pgstat_clip_activity(const char *raw_activity)
 
 	return activity;
 }
+
+/* --------
+ * pgstat_report_backend_mem_allocated_increase() -
+ *
+ * Called to report increase in memory allocated for this backend
+ * --------
+ */
+void
+pgstat_report_backend_mem_allocated_increase(uint64 allocation)
+{
+	volatile PgBackendStatus *beentry = MyBEEntry;
+
+	if (!beentry || !pgstat_track_activities)
+	{
+		/*
+		 * Account for memory before pgstats is initialized. This will be
+		 * migrated to pgstats on initialization.
+		 */
+		backend_mem_allocated += allocation;
+
+		return;
+	}
+
+	/*
+	 * Update my status entry, following the protocol of bumping
+	 * st_changecount before and after.  We use a volatile pointer here to
+	 * ensure the compiler doesn't try to get cute.
+	 */
+	PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
+	beentry->backend_mem_allocated += allocation;
+	PGSTAT_END_WRITE_ACTIVITY(beentry);
+}
+
+/* --------
+ * pgstat_report_backend_mem_allocated_decrease() -
+ *
+ * Called to report decrease in memory allocated for this backend
+ * --------
+ */
+void
+pgstat_report_backend_mem_allocated_decrease(uint64 deallocation)
+{
+	volatile PgBackendStatus *beentry = MyBEEntry;
+
+	/*
+	 * Cases may occur where shared memory from a previous postmaster
+	 * invocation still exist. These are cleaned up at startup by
+	 * dsm_cleanup_using_control_segment. Limit decreasing memory allocated to
+	 * zero in case no corresponding prior increase exists or decrease has
+	 * already been accounted for.
+	 */
+
+	if (!beentry || !pgstat_track_activities)
+	{
+		/*
+		 * Account for memory before pgstats is initialized. This will be
+		 * migrated to pgstats on initialization. Do not allow
+		 * backend_mem_allocated to go below zero. If pgstats has not been
+		 * initialized, we are in startup and we set backend_mem_allocated to
+		 * zero in cases where it would go negative and skip generating an
+		 * ereport.
+		 */
+		if (deallocation > backend_mem_allocated)
+			backend_mem_allocated = 0;
+		else
+			backend_mem_allocated -= deallocation;
+
+		return;
+	}
+
+	/*
+	 * Do not allow backend_mem_allocated to go below zero. ereport if we
+	 * would have. There's no need for a lock around the read here asit's
+	 * being referenced from the same backend which means that there shouldn't
+	 * be concurrent writes. We want to generate an ereport in these cases.
+	 */
+	if (deallocation > beentry->backend_mem_allocated)
+	{
+		ereport(LOG, (errmsg("decrease reduces reported backend memory allocated below zero; setting reported to 0")));
+
+		/*
+		 * Overwrite deallocation with current backend_mem_allocated so we end
+		 * up at zero.
+		 */
+		deallocation = beentry->backend_mem_allocated;
+	}
+
+	/*
+	 * Update my status entry, following the protocol of bumping
+	 * st_changecount before and after.  We use a volatile pointer here to
+	 * ensure the compiler doesn't try to get cute.
+	 */
+	PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
+	beentry->backend_mem_allocated -= deallocation;
+	PGSTAT_END_WRITE_ACTIVITY(beentry);
+}
diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c
index 4cca30aae7..1574aa8049 100644
--- a/src/backend/utils/adt/pgstatfuncs.c
+++ b/src/backend/utils/adt/pgstatfuncs.c
@@ -536,7 +536,7 @@ pg_stat_get_progress_info(PG_FUNCTION_ARGS)
 Datum
 pg_stat_get_activity(PG_FUNCTION_ARGS)
 {
-#define PG_STAT_GET_ACTIVITY_COLS	30
+#define PG_STAT_GET_ACTIVITY_COLS	31
 	int			num_backends = pgstat_fetch_stat_numbackends();
 	int			curr_backend;
 	int			pid = PG_ARGISNULL(0) ? -1 : PG_GETARG_INT32(0);
@@ -610,6 +610,8 @@ pg_stat_get_activity(PG_FUNCTION_ARGS)
 		else
 			nulls[16] = true;
 
+		values[30] = UInt64GetDatum(beentry->backend_mem_allocated);
+
 		/* Values only available to role member or pg_read_all_stats */
 		if (HAS_PGSTAT_PERMISSIONS(beentry->st_userid))
 		{
diff --git a/src/backend/utils/mmgr/aset.c b/src/backend/utils/mmgr/aset.c
index b6eeb8abab..c91f8efa4d 100644
--- a/src/backend/utils/mmgr/aset.c
+++ b/src/backend/utils/mmgr/aset.c
@@ -47,6 +47,7 @@
 #include "postgres.h"
 
 #include "port/pg_bitutils.h"
+#include "utils/backend_status.h"
 #include "utils/memdebug.h"
 #include "utils/memutils.h"
 #include "utils/memutils_memorychunk.h"
@@ -509,6 +510,7 @@ AllocSetContextCreateInternal(MemoryContext parent,
 						name);
 
 	((MemoryContext) set)->mem_allocated = firstBlockSize;
+	pgstat_report_backend_mem_allocated_increase(firstBlockSize);
 
 	return (MemoryContext) set;
 }
@@ -532,6 +534,7 @@ AllocSetReset(MemoryContext context)
 	AllocBlock	block;
 	Size		keepersize PG_USED_FOR_ASSERTS_ONLY
 	= set->keeper->endptr - ((char *) set);
+	uint64		deallocation = 0;
 
 	AssertArg(AllocSetIsValid(set));
 
@@ -571,6 +574,7 @@ AllocSetReset(MemoryContext context)
 		{
 			/* Normal case, release the block */
 			context->mem_allocated -= block->endptr - ((char *) block);
+			deallocation += block->endptr - ((char *) block);
 
 #ifdef CLOBBER_FREED_MEMORY
 			wipe_mem(block, block->freeptr - ((char *) block));
@@ -581,6 +585,7 @@ AllocSetReset(MemoryContext context)
 	}
 
 	Assert(context->mem_allocated == keepersize);
+	pgstat_report_backend_mem_allocated_decrease(deallocation);
 
 	/* Reset block size allocation sequence, too */
 	set->nextBlockSize = set->initBlockSize;
@@ -600,6 +605,7 @@ AllocSetDelete(MemoryContext context)
 	AllocBlock	block = set->blocks;
 	Size		keepersize PG_USED_FOR_ASSERTS_ONLY
 	= set->keeper->endptr - ((char *) set);
+	uint64		deallocation = 0;
 
 	AssertArg(AllocSetIsValid(set));
 
@@ -635,11 +641,13 @@ AllocSetDelete(MemoryContext context)
 
 				freelist->first_free = (AllocSetContext *) oldset->header.nextchild;
 				freelist->num_free--;
+				deallocation += oldset->header.mem_allocated;
 
 				/* All that remains is to free the header/initial block */
 				free(oldset);
 			}
 			Assert(freelist->num_free == 0);
+			pgstat_report_backend_mem_allocated_decrease(deallocation);
 		}
 
 		/* Now add the just-deleted context to the freelist. */
@@ -656,7 +664,10 @@ AllocSetDelete(MemoryContext context)
 		AllocBlock	next = block->next;
 
 		if (block != set->keeper)
+		{
 			context->mem_allocated -= block->endptr - ((char *) block);
+			deallocation += block->endptr - ((char *) block);
+		}
 
 #ifdef CLOBBER_FREED_MEMORY
 		wipe_mem(block, block->freeptr - ((char *) block));
@@ -669,6 +680,8 @@ AllocSetDelete(MemoryContext context)
 	}
 
 	Assert(context->mem_allocated == keepersize);
+	pgstat_report_backend_mem_allocated_decrease(deallocation +
+												 context->mem_allocated);
 
 	/* Finally, free the context header, including the keeper block */
 	free(set);
@@ -712,6 +725,7 @@ AllocSetAlloc(MemoryContext context, Size size)
 			return NULL;
 
 		context->mem_allocated += blksize;
+		pgstat_report_backend_mem_allocated_increase(blksize);
 
 		block->aset = set;
 		block->freeptr = block->endptr = ((char *) block) + blksize;
@@ -916,6 +930,7 @@ AllocSetAlloc(MemoryContext context, Size size)
 			return NULL;
 
 		context->mem_allocated += blksize;
+		pgstat_report_backend_mem_allocated_increase(blksize);
 
 		block->aset = set;
 		block->freeptr = ((char *) block) + ALLOC_BLOCKHDRSZ;
@@ -1016,6 +1031,7 @@ AllocSetFree(void *pointer)
 			block->next->prev = block->prev;
 
 		set->header.mem_allocated -= block->endptr - ((char *) block);
+		pgstat_report_backend_mem_allocated_decrease(block->endptr - ((char *) block));
 
 #ifdef CLOBBER_FREED_MEMORY
 		wipe_mem(block, block->freeptr - ((char *) block));
@@ -1127,7 +1143,9 @@ AllocSetRealloc(void *pointer, Size size)
 
 		/* updated separately, not to underflow when (oldblksize > blksize) */
 		set->header.mem_allocated -= oldblksize;
+		pgstat_report_backend_mem_allocated_decrease(oldblksize);
 		set->header.mem_allocated += blksize;
+		pgstat_report_backend_mem_allocated_increase(blksize);
 
 		block->freeptr = block->endptr = ((char *) block) + blksize;
 
diff --git a/src/backend/utils/mmgr/generation.c b/src/backend/utils/mmgr/generation.c
index b39894ec94..36e5b3f94d 100644
--- a/src/backend/utils/mmgr/generation.c
+++ b/src/backend/utils/mmgr/generation.c
@@ -37,6 +37,7 @@
 
 #include "lib/ilist.h"
 #include "port/pg_bitutils.h"
+#include "utils/backend_status.h"
 #include "utils/memdebug.h"
 #include "utils/memutils.h"
 #include "utils/memutils_memorychunk.h"
@@ -258,6 +259,7 @@ GenerationContextCreate(MemoryContext parent,
 						name);
 
 	((MemoryContext) set)->mem_allocated = firstBlockSize;
+	pgstat_report_backend_mem_allocated_increase(firstBlockSize);
 
 	return (MemoryContext) set;
 }
@@ -274,6 +276,7 @@ GenerationReset(MemoryContext context)
 {
 	GenerationContext *set = (GenerationContext *) context;
 	dlist_mutable_iter miter;
+	uint64	deallocation = 0;
 
 	AssertArg(GenerationIsValid(set));
 
@@ -296,9 +299,14 @@ GenerationReset(MemoryContext context)
 		if (block == set->keeper)
 			GenerationBlockMarkEmpty(block);
 		else
+		{
+			deallocation += block->blksize;
 			GenerationBlockFree(set, block);
+		}
 	}
 
+	pgstat_report_backend_mem_allocated_decrease(deallocation);
+
 	/* set it so new allocations to make use of the keeper block */
 	set->block = set->keeper;
 
@@ -319,6 +327,9 @@ GenerationDelete(MemoryContext context)
 {
 	/* Reset to release all releasable GenerationBlocks */
 	GenerationReset(context);
+
+	pgstat_report_backend_mem_allocated_decrease(context->mem_allocated);
+
 	/* And free the context header and keeper block */
 	free(context);
 }
@@ -355,6 +366,7 @@ GenerationAlloc(MemoryContext context, Size size)
 			return NULL;
 
 		context->mem_allocated += blksize;
+		pgstat_report_backend_mem_allocated_increase(blksize);
 
 		/* block with a single (used) chunk */
 		block->context = set;
@@ -458,6 +470,7 @@ GenerationAlloc(MemoryContext context, Size size)
 				return NULL;
 
 			context->mem_allocated += blksize;
+			pgstat_report_backend_mem_allocated_increase(blksize);
 
 			/* initialize the new block */
 			GenerationBlockInit(set, block, blksize);
@@ -691,6 +704,8 @@ GenerationFree(void *pointer)
 	dlist_delete(&block->node);
 
 	set->header.mem_allocated -= block->blksize;
+	pgstat_report_backend_mem_allocated_decrease(block->blksize);
+
 	free(block);
 }
 
diff --git a/src/backend/utils/mmgr/slab.c b/src/backend/utils/mmgr/slab.c
index 2d70adef09..efc8bcfaa7 100644
--- a/src/backend/utils/mmgr/slab.c
+++ b/src/backend/utils/mmgr/slab.c
@@ -53,6 +53,7 @@
 #include "postgres.h"
 
 #include "lib/ilist.h"
+#include "utils/backend_status.h"
 #include "utils/memdebug.h"
 #include "utils/memutils.h"
 #include "utils/memutils_memorychunk.h"
@@ -218,6 +219,12 @@ SlabContextCreate(MemoryContext parent,
 						parent,
 						name);
 
+	/*
+	 * If SlabContextCreate is updated to add headerSize to
+	 * context->mem_allocated, then update here and SlabDelete appropriately
+	 */
+	pgstat_report_backend_mem_allocated_increase(headerSize);
+
 	return (MemoryContext) slab;
 }
 
@@ -233,6 +240,7 @@ SlabReset(MemoryContext context)
 {
 	int			i;
 	SlabContext *slab = castNode(SlabContext, context);
+	uint64		deallocation = 0;
 
 	Assert(slab);
 
@@ -258,9 +266,11 @@ SlabReset(MemoryContext context)
 			free(block);
 			slab->nblocks--;
 			context->mem_allocated -= slab->blockSize;
+			deallocation += slab->blockSize;
 		}
 	}
 
+	pgstat_report_backend_mem_allocated_decrease(deallocation);
 	slab->minFreeChunks = 0;
 
 	Assert(slab->nblocks == 0);
@@ -274,8 +284,17 @@ SlabReset(MemoryContext context)
 void
 SlabDelete(MemoryContext context)
 {
+	/*
+	 * Until header allocation is included in context->mem_allocated cast to
+	 * slab and decrement the headerSize
+	 */
+	SlabContext *slab = castNode(SlabContext, context);
+
 	/* Reset to release all the SlabBlocks */
 	SlabReset(context);
+
+	pgstat_report_backend_mem_allocated_decrease(slab->headerSize);
+
 	/* And free the context header */
 	free(context);
 }
@@ -344,6 +363,7 @@ SlabAlloc(MemoryContext context, Size size)
 		slab->minFreeChunks = slab->chunksPerBlock;
 		slab->nblocks += 1;
 		context->mem_allocated += slab->blockSize;
+		pgstat_report_backend_mem_allocated_increase(slab->blockSize);
 	}
 
 	/* grab the block from the freelist (even the new block is there) */
@@ -511,6 +531,7 @@ SlabFree(void *pointer)
 		free(block);
 		slab->nblocks--;
 		slab->header.mem_allocated -= slab->blockSize;
+		pgstat_report_backend_mem_allocated_decrease(slab->blockSize);
 	}
 	else
 		dlist_push_head(&slab->freelist[block->nfree], &block->node);
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index be47583122..e1bfb85b25 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -5340,9 +5340,9 @@
   proname => 'pg_stat_get_activity', prorows => '100', proisstrict => 'f',
   proretset => 't', provolatile => 's', proparallel => 'r',
   prorettype => 'record', proargtypes => 'int4',
-  proallargtypes => '{int4,oid,int4,oid,text,text,text,text,text,timestamptz,timestamptz,timestamptz,timestamptz,inet,text,int4,xid,xid,text,bool,text,text,int4,text,numeric,text,bool,text,bool,int4,int8}',
-  proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
-  proargnames => '{pid,datid,pid,usesysid,application_name,state,query,wait_event_type,wait_event,xact_start,query_start,backend_start,state_change,client_addr,client_hostname,client_port,backend_xid,backend_xmin,backend_type,ssl,sslversion,sslcipher,sslbits,ssl_client_dn,ssl_client_serial,ssl_issuer_dn,gss_auth,gss_princ,gss_enc,leader_pid,query_id}',
+  proallargtypes => '{int4,oid,int4,oid,text,text,text,text,text,timestamptz,timestamptz,timestamptz,timestamptz,inet,text,int4,xid,xid,text,bool,text,text,int4,text,numeric,text,bool,text,bool,int4,int8,int8}',
+  proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
+  proargnames => '{pid,datid,pid,usesysid,application_name,state,query,wait_event_type,wait_event,xact_start,query_start,backend_start,state_change,client_addr,client_hostname,client_port,backend_xid,backend_xmin,backend_type,ssl,sslversion,sslcipher,sslbits,ssl_client_dn,ssl_client_serial,ssl_issuer_dn,gss_auth,gss_princ,gss_enc,leader_pid,query_id,backend_mem_allocated}',
   prosrc => 'pg_stat_get_activity' },
 { oid => '3318',
   descr => 'statistics: information about progress of backends running maintenance command',
diff --git a/src/include/utils/backend_status.h b/src/include/utils/backend_status.h
index 7403bca25e..9bdc4197bd 100644
--- a/src/include/utils/backend_status.h
+++ b/src/include/utils/backend_status.h
@@ -168,6 +168,9 @@ typedef struct PgBackendStatus
 
 	/* query identifier, optionally computed using post_parse_analyze_hook */
 	uint64		st_query_id;
+
+	/* Current memory allocated to this backend */
+	uint64		backend_mem_allocated;
 } PgBackendStatus;
 
 
@@ -305,7 +308,9 @@ extern const char *pgstat_get_backend_current_activity(int pid, bool checkUser);
 extern const char *pgstat_get_crashed_backend_activity(int pid, char *buffer,
 													   int buflen);
 extern uint64 pgstat_get_my_query_id(void);
-
+extern void pgstat_report_backend_mem_allocated_increase(uint64 allocation);
+extern void pgstat_report_backend_mem_allocated_decrease(uint64 deallocation);
+extern uint64 pgstat_get_all_backend_memory_allocated(void);
 
 /* ----------
  * Support functions for the SQL-callable functions to
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index 7ec3d2688f..674e5c6fe7 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -1757,9 +1757,10 @@ pg_stat_activity| SELECT s.datid,
     s.backend_xid,
     s.backend_xmin,
     s.query_id,
+    s.backend_mem_allocated,
     s.query,
     s.backend_type
-   FROM ((pg_stat_get_activity(NULL::integer) s(datid, pid, usesysid, application_name, state, query, wait_event_type, wait_event, xact_start, query_start, backend_start, state_change, client_addr, client_hostname, client_port, backend_xid, backend_xmin, backend_type, ssl, sslversion, sslcipher, sslbits, ssl_client_dn, ssl_client_serial, ssl_issuer_dn, gss_auth, gss_princ, gss_enc, leader_pid, query_id)
+   FROM ((pg_stat_get_activity(NULL::integer) s(datid, pid, usesysid, application_name, state, query, wait_event_type, wait_event, xact_start, query_start, backend_start, state_change, client_addr, client_hostname, client_port, backend_xid, backend_xmin, backend_type, ssl, sslversion, sslcipher, sslbits, ssl_client_dn, ssl_client_serial, ssl_issuer_dn, gss_auth, gss_princ, gss_enc, leader_pid, query_id, backend_mem_allocated)
      LEFT JOIN pg_database d ON ((s.datid = d.oid)))
      LEFT JOIN pg_authid u ON ((s.usesysid = u.oid)));
 pg_stat_all_indexes| SELECT c.oid AS relid,
@@ -1871,7 +1872,7 @@ pg_stat_gssapi| SELECT s.pid,
     s.gss_auth AS gss_authenticated,
     s.gss_princ AS principal,
     s.gss_enc AS encrypted
-   FROM pg_stat_get_activity(NULL::integer) s(datid, pid, usesysid, application_name, state, query, wait_event_type, wait_event, xact_start, query_start, backend_start, state_change, client_addr, client_hostname, client_port, backend_xid, backend_xmin, backend_type, ssl, sslversion, sslcipher, sslbits, ssl_client_dn, ssl_client_serial, ssl_issuer_dn, gss_auth, gss_princ, gss_enc, leader_pid, query_id)
+   FROM pg_stat_get_activity(NULL::integer) s(datid, pid, usesysid, application_name, state, query, wait_event_type, wait_event, xact_start, query_start, backend_start, state_change, client_addr, client_hostname, client_port, backend_xid, backend_xmin, backend_type, ssl, sslversion, sslcipher, sslbits, ssl_client_dn, ssl_client_serial, ssl_issuer_dn, gss_auth, gss_princ, gss_enc, leader_pid, query_id, backend_mem_allocated)
   WHERE (s.client_port IS NOT NULL);
 pg_stat_progress_analyze| SELECT s.pid,
     s.datid,
@@ -2052,7 +2053,7 @@ pg_stat_replication| SELECT s.pid,
     w.sync_priority,
     w.sync_state,
     w.reply_time
-   FROM ((pg_stat_get_activity(NULL::integer) s(datid, pid, usesysid, application_name, state, query, wait_event_type, wait_event, xact_start, query_start, backend_start, state_change, client_addr, client_hostname, client_port, backend_xid, backend_xmin, backend_type, ssl, sslversion, sslcipher, sslbits, ssl_client_dn, ssl_client_serial, ssl_issuer_dn, gss_auth, gss_princ, gss_enc, leader_pid, query_id)
+   FROM ((pg_stat_get_activity(NULL::integer) s(datid, pid, usesysid, application_name, state, query, wait_event_type, wait_event, xact_start, query_start, backend_start, state_change, client_addr, client_hostname, client_port, backend_xid, backend_xmin, backend_type, ssl, sslversion, sslcipher, sslbits, ssl_client_dn, ssl_client_serial, ssl_issuer_dn, gss_auth, gss_princ, gss_enc, leader_pid, query_id, backend_mem_allocated)
      JOIN pg_stat_get_wal_senders() w(pid, state, sent_lsn, write_lsn, flush_lsn, replay_lsn, write_lag, flush_lag, replay_lag, sync_priority, sync_state, reply_time) ON ((s.pid = w.pid)))
      LEFT JOIN pg_authid u ON ((s.usesysid = u.oid)));
 pg_stat_replication_slots| SELECT s.slot_name,
@@ -2086,7 +2087,7 @@ pg_stat_ssl| SELECT s.pid,
     s.ssl_client_dn AS client_dn,
     s.ssl_client_serial AS client_serial,
     s.ssl_issuer_dn AS issuer_dn
-   FROM pg_stat_get_activity(NULL::integer) s(datid, pid, usesysid, application_name, state, query, wait_event_type, wait_event, xact_start, query_start, backend_start, state_change, client_addr, client_hostname, client_port, backend_xid, backend_xmin, backend_type, ssl, sslversion, sslcipher, sslbits, ssl_client_dn, ssl_client_serial, ssl_issuer_dn, gss_auth, gss_princ, gss_enc, leader_pid, query_id)
+   FROM pg_stat_get_activity(NULL::integer) s(datid, pid, usesysid, application_name, state, query, wait_event_type, wait_event, xact_start, query_start, backend_start, state_change, client_addr, client_hostname, client_port, backend_xid, backend_xmin, backend_type, ssl, sslversion, sslcipher, sslbits, ssl_client_dn, ssl_client_serial, ssl_issuer_dn, gss_auth, gss_princ, gss_enc, leader_pid, query_id, backend_mem_allocated)
   WHERE (s.client_port IS NOT NULL);
 pg_stat_subscription| SELECT su.oid AS subid,
     su.subname,
