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diff --git a/storage/perfschema/pfs.h b/storage/perfschema/pfs.h
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+/* Copyright (c) 2008, 2023, Oracle and/or its affiliates.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License, version 2.0,
+  as published by the Free Software Foundation.
+
+  This program is also distributed with certain software (including
+  but not limited to OpenSSL) that is licensed under separate terms,
+  as designated in a particular file or component or in included license
+  documentation.  The authors of MySQL hereby grant you an additional
+  permission to link the program and your derivative works with the
+  separately licensed software that they have included with MySQL.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License, version 2.0, for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software Foundation,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#ifndef PFS_H
+#define PFS_H
+
+/**
+  @file storage/perfschema/pfs.h
+  Performance schema instrumentation (declarations).
+*/
+
+#define HAVE_PSI_1
+
+#include <my_global.h>
+#include "my_thread.h"
+#include <mysql/psi/psi.h>
+
+/**
+  Entry point to the performance schema implementation.
+  This singleton is used to discover the performance schema services.
+*/
+extern struct PSI_bootstrap PFS_bootstrap;
+/** Performance schema Thread Local Storage key.  */
+extern pthread_key_t THR_PFS;
+extern pthread_key_t THR_PFS_VG;  // global_variables
+extern pthread_key_t THR_PFS_SV;  // session_variables
+extern pthread_key_t THR_PFS_VBT; // variables_by_thread
+extern pthread_key_t THR_PFS_SG;  // global_status
+extern pthread_key_t THR_PFS_SS;  // session_status
+extern pthread_key_t THR_PFS_SBT; // status_by_thread
+extern pthread_key_t THR_PFS_SBU; // status_by_user
+extern pthread_key_t THR_PFS_SBA; // status_by_host
+extern pthread_key_t THR_PFS_SBH; // status_by_account
+
+/** True when @c THR_PFS and all other Performance Schema TLS keys are initialized. */
+extern bool THR_PFS_initialized;
+
+#define PSI_VOLATILITY_UNKNOWN 0
+#define PSI_VOLATILITY_SESSION 1
+
+#define PSI_COUNT_VOLATILITY 2
+
+#endif
+