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diff --git a/storage/perfschema/pfs_con_slice.h b/storage/perfschema/pfs_con_slice.h
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+++ b/storage/perfschema/pfs_con_slice.h
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+/* Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; version 2 of the License.
+
+  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 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, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#ifndef PFS_CON_SLICE_H
+#define PFS_CON_SLICE_H
+
+/**
+  @file storage/perfschema/pfs_con_slice.h
+  Performance schema connection slice (declarations).
+*/
+
+#include "pfs_lock.h"
+#include "lf.h"
+
+struct PFS_single_stat;
+struct PFS_stage_stat;
+struct PFS_statement_stat;
+
+/**
+  @addtogroup Performance_schema_buffers
+  @{
+*/
+
+/**
+  A connection slice, an arbitrary grouping of several connections.
+  This structure holds statistics for grouping of connections.
+*/
+struct PFS_connection_slice
+{
+  /**
+    Allocate memory for waits statistics.
+    @param sizing the number of wait classes.
+    @return wait statistics for this slice.
+  */
+  static PFS_single_stat *alloc_waits_slice(uint sizing);
+  /**
+    Allocate memory for stages statistics.
+    @param sizing the number of stage classes.
+    @return stage statistics for this slice.
+  */
+  static PFS_stage_stat *alloc_stages_slice(uint sizing);
+  /**
+    Allocate memory for statement statistics.
+    @param sizing the number of statement classes.
+    @return statement statistics for this slice.
+  */
+  static PFS_statement_stat *alloc_statements_slice(uint sizing);
+
+  /** Reset all statistics. */
+  inline void reset_stats()
+  {
+    reset_waits_stats();
+    reset_stages_stats();
+    reset_statements_stats();
+  }
+
+  /** Reset all wait statistics. */
+  void reset_waits_stats();
+  /** Reset all stages statistics. */
+  void reset_stages_stats();
+  /** Reset all statements statistics. */
+  void reset_statements_stats();
+
+  /**
+    Per connection slice waits aggregated statistics.
+    This member holds the data for the table
+    PERFORMANCE_SCHEMA.EVENTS_WAITS_SUMMARY_BY_*_BY_EVENT_NAME.
+    Immutable, safe to use without internal lock.
+  */
+  PFS_single_stat *m_instr_class_waits_stats;
+
+  /**
+    Per connection slice stages aggregated statistics.
+    This member holds the data for the table
+    PERFORMANCE_SCHEMA.EVENTS_STAGES_SUMMARY_BY_*_BY_EVENT_NAME.
+    Immutable, safe to use without internal lock.
+  */
+  PFS_stage_stat *m_instr_class_stages_stats;
+
+  /**
+    Per connection slice statements aggregated statistics.
+    This member holds the data for the table
+    PERFORMANCE_SCHEMA.EVENTS_STATEMENTS_SUMMARY_BY_*_BY_EVENT_NAME.
+    Immutable, safe to use without internal lock.
+  */
+  PFS_statement_stat *m_instr_class_statements_stats;
+};
+
+/** @} */
+#endif
+