Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1332 insertions, 0 deletions

diff --git a/storage/perfschema/pfs_stat.h b/storage/perfschema/pfs_stat.h
new file mode 100644
index 00000000..e3e06760
--- /dev/null
+++ b/storage/perfschema/pfs_stat.h
@@ -0,0 +1,1332 @@
+/* Copyright (c) 2008, 2015, 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, 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_STAT_H
+#define PFS_STAT_H
+
+#include <algorithm>
+#include "sql_const.h"
+/* memcpy */
+#include "string.h"
+
+/**
+  @file storage/perfschema/pfs_stat.h
+  Statistics (declarations).
+*/
+
+/**
+  @addtogroup Performance_schema_buffers
+  @{
+*/
+
+/** Single statistic. */
+struct PFS_single_stat
+{
+  /** Count of values. */
+  ulonglong m_count;
+  /** Sum of values. */
+  ulonglong m_sum;
+  /** Minimum value. */
+  ulonglong m_min;
+  /** Maximum value. */
+  ulonglong m_max;
+
+  PFS_single_stat()
+  {
+    m_count= 0;
+    m_sum= 0;
+    m_min= ULLONG_MAX;
+    m_max= 0;
+  }
+
+  inline void reset(void)
+  {
+    m_count= 0;
+    m_sum= 0;
+    m_min= ULLONG_MAX;
+    m_max= 0;
+  }
+
+  inline bool has_timed_stats() const
+  {
+    return (m_min <= m_max);
+  }
+
+  inline void aggregate(const PFS_single_stat *stat)
+  {
+    if (stat->m_count != 0)
+    {
+      m_count+= stat->m_count;
+      m_sum+= stat->m_sum;
+      if (unlikely(m_min > stat->m_min))
+        m_min= stat->m_min;
+      if (unlikely(m_max < stat->m_max))
+        m_max= stat->m_max;
+    }
+  }
+
+  inline void aggregate_no_check(const PFS_single_stat *stat)
+  {
+    m_count+= stat->m_count;
+    m_sum+= stat->m_sum;
+    if (unlikely(m_min > stat->m_min))
+      m_min= stat->m_min;
+    if (unlikely(m_max < stat->m_max))
+      m_max= stat->m_max;
+  }
+
+  inline void aggregate_counted()
+  {
+    m_count++;
+  }
+
+  inline void aggregate_counted(ulonglong count)
+  {
+    m_count+= count;
+  }
+
+  inline void aggregate_value(ulonglong value)
+  {
+    m_count++;
+    m_sum+= value;
+    if (unlikely(m_min > value))
+      m_min= value;
+    if (unlikely(m_max < value))
+      m_max= value;
+  }
+
+  inline void aggregate_many_value(ulonglong value, ulonglong count)
+  {
+    m_count+= count;
+    m_sum+= value;
+    if (unlikely(m_min > value))
+      m_min= value;
+    if (unlikely(m_max < value))
+      m_max= value;
+  }
+};
+
+/** Combined statistic. */
+struct PFS_byte_stat : public PFS_single_stat
+{
+  /** Byte count statistics */
+  ulonglong m_bytes;
+
+  /** Aggregate wait stats, event count and byte count */
+  inline void aggregate(const PFS_byte_stat *stat)
+  {
+    if (stat->m_count != 0)
+    {
+      PFS_single_stat::aggregate_no_check(stat);
+      m_bytes+= stat->m_bytes;
+    }
+  }
+
+  /** Aggregate wait stats, event count and byte count */
+  inline void aggregate_no_check(const PFS_byte_stat *stat)
+  {
+    PFS_single_stat::aggregate_no_check(stat);
+    m_bytes+= stat->m_bytes;
+  }
+
+  /** Aggregate individual wait time, event count and byte count */
+  inline void aggregate(ulonglong wait, ulonglong bytes)
+  {
+    aggregate_value(wait);
+    m_bytes+= bytes;
+  }
+
+  /** Aggregate wait stats and event count */
+  inline void aggregate_waits(const PFS_byte_stat *stat)
+  {
+    PFS_single_stat::aggregate(stat);
+  }
+
+  /** Aggregate event count and byte count */
+  inline void aggregate_counted()
+  {
+    PFS_single_stat::aggregate_counted();
+  }
+
+  /** Aggregate event count and byte count */
+  inline void aggregate_counted(ulonglong bytes)
+  {
+    PFS_single_stat::aggregate_counted();
+    m_bytes+= bytes;
+  }
+
+  PFS_byte_stat()
+  {
+    reset();
+  }
+
+  inline void reset(void)
+  {
+    PFS_single_stat::reset();
+    m_bytes= 0;
+  }
+};
+
+/** Statistics for mutex usage. */
+struct PFS_mutex_stat
+{
+  /** Wait statistics. */
+  PFS_single_stat m_wait_stat;
+#ifdef PFS_LATER
+  /**
+    Lock statistics.
+    This statistic is not exposed in user visible tables yet.
+  */
+  PFS_single_stat m_lock_stat;
+#endif
+
+  inline void aggregate(const PFS_mutex_stat *stat)
+  {
+    m_wait_stat.aggregate(&stat->m_wait_stat);
+#ifdef PFS_LATER
+    m_lock_stat.aggregate(&stat->m_lock_stat);
+#endif
+  }
+
+  inline void reset(void)
+  {
+    m_wait_stat.reset();
+#ifdef PFS_LATER
+    m_lock_stat.reset();
+#endif
+  }
+};
+
+/** Statistics for rwlock usage. */
+struct PFS_rwlock_stat
+{
+  /** Wait statistics. */
+  PFS_single_stat m_wait_stat;
+#ifdef PFS_LATER
+  /**
+    RWLock read lock usage statistics.
+    This statistic is not exposed in user visible tables yet.
+  */
+  PFS_single_stat m_read_lock_stat;
+  /**
+    RWLock write lock usage statistics.
+    This statistic is not exposed in user visible tables yet.
+  */
+  PFS_single_stat m_write_lock_stat;
+#endif
+
+  inline void aggregate(const PFS_rwlock_stat *stat)
+  {
+    m_wait_stat.aggregate(&stat->m_wait_stat);
+#ifdef PFS_LATER
+    m_read_lock_stat.aggregate(&stat->m_read_lock_stat);
+    m_write_lock_stat.aggregate(&stat->m_write_lock_stat);
+#endif
+  }
+
+  inline void reset(void)
+  {
+    m_wait_stat.reset();
+#ifdef PFS_LATER
+    m_read_lock_stat.reset();
+    m_write_lock_stat.reset();
+#endif
+  }
+};
+
+/** Statistics for COND usage. */
+struct PFS_cond_stat
+{
+  /** Wait statistics. */
+  PFS_single_stat m_wait_stat;
+#ifdef PFS_LATER
+  /**
+    Number of times a condition was signalled.
+    This statistic is not exposed in user visible tables yet.
+  */
+  ulonglong m_signal_count;
+  /**
+    Number of times a condition was broadcast.
+    This statistic is not exposed in user visible tables yet.
+  */
+  ulonglong m_broadcast_count;
+#endif
+
+  inline void aggregate(const PFS_cond_stat *stat)
+  {
+    m_wait_stat.aggregate(&stat->m_wait_stat);
+#ifdef PFS_LATER
+    m_signal_count+= stat->m_signal_count;
+    m_broadcast_count+= stat->m_broadcast_count;
+#endif
+  }
+
+  inline void reset(void)
+  {
+    m_wait_stat.reset();
+#ifdef PFS_LATER
+    m_signal_count= 0;
+    m_broadcast_count= 0;
+#endif
+  }
+};
+
+/** Statistics for FILE IO. Used for both waits and byte counts. */
+struct PFS_file_io_stat
+{
+  /** READ statistics */
+  PFS_byte_stat m_read;
+  /** WRITE statistics */
+  PFS_byte_stat m_write;
+  /** Miscellaneous statistics */
+  PFS_byte_stat m_misc;
+
+  inline void reset(void)
+  {
+    m_read.reset();
+    m_write.reset();
+    m_misc.reset();
+  }
+
+  inline void aggregate(const PFS_file_io_stat *stat)
+  {
+    m_read.aggregate(&stat->m_read);
+    m_write.aggregate(&stat->m_write);
+    m_misc.aggregate(&stat->m_misc);
+  }
+
+  /* Sum waits and byte counts */
+  inline void sum(PFS_byte_stat *stat)
+  {
+    stat->aggregate(&m_read);
+    stat->aggregate(&m_write);
+    stat->aggregate(&m_misc);
+  }
+
+  /* Sum waits only */
+  inline void sum_waits(PFS_single_stat *stat)
+  {
+    stat->aggregate(&m_read);
+    stat->aggregate(&m_write);
+    stat->aggregate(&m_misc);
+  }
+};
+
+/** Statistics for FILE usage. */
+struct PFS_file_stat
+{
+  /** Number of current open handles. */
+  ulong m_open_count;
+  /** File IO statistics. */
+  PFS_file_io_stat m_io_stat;
+
+  inline void aggregate(const PFS_file_stat *stat)
+  {
+    m_io_stat.aggregate(&stat->m_io_stat);
+  }
+
+  /** Reset file statistics. */
+  inline void reset(void)
+  {
+    m_io_stat.reset();
+  }
+};
+
+/** Statistics for stage usage. */
+struct PFS_stage_stat
+{
+  PFS_single_stat m_timer1_stat;
+
+  inline void reset(void)
+  { m_timer1_stat.reset(); }
+
+  inline void aggregate_counted()
+  { m_timer1_stat.aggregate_counted(); }
+
+  inline void aggregate_value(ulonglong value)
+  { m_timer1_stat.aggregate_value(value); }
+
+  inline void aggregate(const PFS_stage_stat *stat)
+  { m_timer1_stat.aggregate(& stat->m_timer1_stat); }
+};
+
+/** Statistics for stored program usage. */
+struct PFS_sp_stat
+{
+  PFS_single_stat m_timer1_stat;
+
+  inline void reset(void)
+  { m_timer1_stat.reset(); }
+
+  inline void aggregate_counted()
+  { m_timer1_stat.aggregate_counted(); }
+
+  inline void aggregate_value(ulonglong value)
+  { m_timer1_stat.aggregate_value(value); }
+
+  inline void aggregate(const PFS_stage_stat *stat)
+  { m_timer1_stat.aggregate(& stat->m_timer1_stat); }
+};
+
+/** Statistics for prepared statement usage. */
+struct PFS_prepared_stmt_stat
+{
+  PFS_single_stat m_timer1_stat;
+
+  inline void reset(void)
+  { m_timer1_stat.reset(); }
+
+  inline void aggregate_counted()
+  { m_timer1_stat.aggregate_counted(); }
+
+  inline void aggregate_value(ulonglong value)
+  { m_timer1_stat.aggregate_value(value); }
+
+  inline void aggregate(PFS_stage_stat *stat)
+  { m_timer1_stat.aggregate(& stat->m_timer1_stat); }
+};
+
+/**
+  Statistics for statement usage.
+  This structure uses lazy initialization,
+  controlled by member @c m_timer1_stat.m_count.
+*/
+struct PFS_statement_stat
+{
+  PFS_single_stat m_timer1_stat;
+  ulonglong m_error_count;
+  ulonglong m_warning_count;
+  ulonglong m_rows_affected;
+  ulonglong m_lock_time;
+  ulonglong m_rows_sent;
+  ulonglong m_rows_examined;
+  ulonglong m_created_tmp_disk_tables;
+  ulonglong m_created_tmp_tables;
+  ulonglong m_select_full_join;
+  ulonglong m_select_full_range_join;
+  ulonglong m_select_range;
+  ulonglong m_select_range_check;
+  ulonglong m_select_scan;
+  ulonglong m_sort_merge_passes;
+  ulonglong m_sort_range;
+  ulonglong m_sort_rows;
+  ulonglong m_sort_scan;
+  ulonglong m_no_index_used;
+  ulonglong m_no_good_index_used;
+
+  PFS_statement_stat()
+  {
+    reset();
+  }
+
+  inline void reset()
+  {
+    m_timer1_stat.m_count= 0;
+  }
+
+  inline void mark_used()
+  {
+    delayed_reset();
+  }
+
+private:
+  inline void delayed_reset(void)
+  {
+    if (m_timer1_stat.m_count == 0)
+    {
+      m_timer1_stat.reset();
+      m_error_count= 0;
+      m_warning_count= 0;
+      m_rows_affected= 0;
+      m_lock_time= 0;
+      m_rows_sent= 0;
+      m_rows_examined= 0;
+      m_created_tmp_disk_tables= 0;
+      m_created_tmp_tables= 0;
+      m_select_full_join= 0;
+      m_select_full_range_join= 0;
+      m_select_range= 0;
+      m_select_range_check= 0;
+      m_select_scan= 0;
+      m_sort_merge_passes= 0;
+      m_sort_range= 0;
+      m_sort_rows= 0;
+      m_sort_scan= 0;
+      m_no_index_used= 0;
+      m_no_good_index_used= 0;
+    }
+  }
+
+public:
+  inline void aggregate_counted()
+  {
+    delayed_reset();
+    m_timer1_stat.aggregate_counted();
+  }
+
+  inline void aggregate_value(ulonglong value)
+  {
+    delayed_reset();
+    m_timer1_stat.aggregate_value(value);
+  }
+
+  inline void aggregate(const PFS_statement_stat *stat)
+  {
+    if (stat->m_timer1_stat.m_count != 0)
+    {
+      delayed_reset();
+      m_timer1_stat.aggregate_no_check(& stat->m_timer1_stat);
+
+      m_error_count+= stat->m_error_count;
+      m_warning_count+= stat->m_warning_count;
+      m_rows_affected+= stat->m_rows_affected;
+      m_lock_time+= stat->m_lock_time;
+      m_rows_sent+= stat->m_rows_sent;
+      m_rows_examined+= stat->m_rows_examined;
+      m_created_tmp_disk_tables+= stat->m_created_tmp_disk_tables;
+      m_created_tmp_tables+= stat->m_created_tmp_tables;
+      m_select_full_join+= stat->m_select_full_join;
+      m_select_full_range_join+= stat->m_select_full_range_join;
+      m_select_range+= stat->m_select_range;
+      m_select_range_check+= stat->m_select_range_check;
+      m_select_scan+= stat->m_select_scan;
+      m_sort_merge_passes+= stat->m_sort_merge_passes;
+      m_sort_range+= stat->m_sort_range;
+      m_sort_rows+= stat->m_sort_rows;
+      m_sort_scan+= stat->m_sort_scan;
+      m_no_index_used+= stat->m_no_index_used;
+      m_no_good_index_used+= stat->m_no_good_index_used;
+    }
+  }
+};
+
+/** Statistics for transaction usage. */
+struct PFS_transaction_stat
+{
+  PFS_single_stat m_read_write_stat;
+  PFS_single_stat m_read_only_stat;
+
+  ulonglong m_savepoint_count;
+  ulonglong m_rollback_to_savepoint_count;
+  ulonglong m_release_savepoint_count;
+
+  PFS_transaction_stat()
+  {
+    m_savepoint_count= 0;
+    m_rollback_to_savepoint_count= 0;
+    m_release_savepoint_count= 0;
+  }
+
+  ulonglong count(void)
+  {
+    return (m_read_write_stat.m_count + m_read_only_stat.m_count);
+  }
+
+  inline void reset(void)
+  {
+    m_read_write_stat.reset();
+    m_read_only_stat.reset();
+    m_savepoint_count= 0;
+    m_rollback_to_savepoint_count= 0;
+    m_release_savepoint_count= 0;
+  }
+
+  inline void aggregate(const PFS_transaction_stat *stat)
+  {
+    m_read_write_stat.aggregate(&stat->m_read_write_stat);
+    m_read_only_stat.aggregate(&stat->m_read_only_stat);
+    m_savepoint_count+= stat->m_savepoint_count;
+    m_rollback_to_savepoint_count+= stat->m_rollback_to_savepoint_count;
+    m_release_savepoint_count+= stat->m_release_savepoint_count;
+  }
+};
+
+/** Single table io statistic. */
+struct PFS_table_io_stat
+{
+  bool m_has_data;
+  /** FETCH statistics */
+  PFS_single_stat m_fetch;
+  /** INSERT statistics */
+  PFS_single_stat m_insert;
+  /** UPDATE statistics */
+  PFS_single_stat m_update;
+  /** DELETE statistics */
+  PFS_single_stat m_delete;
+
+  PFS_table_io_stat()
+  {
+    m_has_data= false;
+  }
+
+  inline void reset(void)
+  {
+    m_has_data= false;
+    m_fetch.reset();
+    m_insert.reset();
+    m_update.reset();
+    m_delete.reset();
+  }
+
+  inline void aggregate(const PFS_table_io_stat *stat)
+  {
+    if (stat->m_has_data)
+    {
+      m_has_data= true;
+      m_fetch.aggregate(&stat->m_fetch);
+      m_insert.aggregate(&stat->m_insert);
+      m_update.aggregate(&stat->m_update);
+      m_delete.aggregate(&stat->m_delete);
+    }
+  }
+
+  inline void sum(PFS_single_stat *result)
+  {
+    if (m_has_data)
+    {
+      result->aggregate(& m_fetch);
+      result->aggregate(& m_insert);
+      result->aggregate(& m_update);
+      result->aggregate(& m_delete);
+    }
+  }
+};
+
+enum PFS_TL_LOCK_TYPE
+{
+  /* Locks from enum thr_lock */
+  PFS_TL_READ= 0,
+  PFS_TL_READ_WITH_SHARED_LOCKS= 1,
+  PFS_TL_READ_HIGH_PRIORITY= 2,
+  PFS_TL_READ_NO_INSERT= 3,
+  PFS_TL_WRITE_ALLOW_WRITE= 4,
+  PFS_TL_WRITE_CONCURRENT_INSERT= 5,
+  PFS_TL_WRITE_DELAYED= 6,
+  PFS_TL_WRITE_LOW_PRIORITY= 7,
+  PFS_TL_WRITE= 8,
+
+  /* Locks for handler::ha_external_lock() */
+  PFS_TL_READ_EXTERNAL= 9,
+  PFS_TL_WRITE_EXTERNAL= 10,
+
+  PFS_TL_NONE= 99
+};
+
+#define COUNT_PFS_TL_LOCK_TYPE 11
+
+/** Statistics for table locks. */
+struct PFS_table_lock_stat
+{
+  PFS_single_stat m_stat[COUNT_PFS_TL_LOCK_TYPE];
+
+  inline void reset(void)
+  {
+    PFS_single_stat *pfs= & m_stat[0];
+    PFS_single_stat *pfs_last= & m_stat[COUNT_PFS_TL_LOCK_TYPE];
+    for ( ; pfs < pfs_last ; pfs++)
+      pfs->reset();
+  }
+
+  inline void aggregate(const PFS_table_lock_stat *stat)
+  {
+    PFS_single_stat *pfs= & m_stat[0];
+    PFS_single_stat *pfs_last= & m_stat[COUNT_PFS_TL_LOCK_TYPE];
+    const PFS_single_stat *pfs_from= & stat->m_stat[0];
+    for ( ; pfs < pfs_last ; pfs++, pfs_from++)
+      pfs->aggregate(pfs_from);
+  }
+
+  inline void sum(PFS_single_stat *result)
+  {
+    PFS_single_stat *pfs= & m_stat[0];
+    PFS_single_stat *pfs_last= & m_stat[COUNT_PFS_TL_LOCK_TYPE];
+    for ( ; pfs < pfs_last ; pfs++)
+      result->aggregate(pfs);
+  }
+};
+
+/** Statistics for TABLE usage. */
+struct PFS_table_stat
+{
+  /**
+    Statistics, per index.
+    Each index stat is in [0, MAX_INDEXES-1],
+    stats when using no index are in [MAX_INDEXES].
+  */
+  PFS_table_io_stat m_index_stat[MAX_INDEXES + 1];
+
+  /**
+    Statistics, per lock type.
+  */
+  PFS_table_lock_stat m_lock_stat;
+
+  /** Reset table io statistic. */
+  inline void reset_io(void)
+  {
+    PFS_table_io_stat *stat= & m_index_stat[0];
+    PFS_table_io_stat *stat_last= & m_index_stat[MAX_INDEXES + 1];
+    for ( ; stat < stat_last ; stat++)
+      stat->reset();
+  }
+
+  /** Reset table lock statistic. */
+  inline void reset_lock(void)
+  {
+    m_lock_stat.reset();
+  }
+
+  /** Reset table statistic. */
+  inline void reset(void)
+  {
+    reset_io();
+    reset_lock();
+  }
+
+  inline void fast_reset_io(void)
+  {
+    memcpy(& m_index_stat, & g_reset_template.m_index_stat, sizeof(m_index_stat));
+  }
+
+  inline void fast_reset_lock(void)
+  {
+    memcpy(& m_lock_stat, & g_reset_template.m_lock_stat, sizeof(m_lock_stat));
+  }
+
+  inline void fast_reset(void)
+  {
+    memcpy(this, & g_reset_template, sizeof(*this));
+  }
+
+  inline void aggregate_io(const PFS_table_stat *stat, uint key_count)
+  {
+    PFS_table_io_stat *to_stat;
+    PFS_table_io_stat *to_stat_last;
+    const PFS_table_io_stat *from_stat;
+
+    DBUG_ASSERT(key_count <= MAX_INDEXES);
+
+    /* Aggregate stats for each index, if any */
+    to_stat= & m_index_stat[0];
+    to_stat_last= to_stat + key_count;
+    from_stat= & stat->m_index_stat[0];
+    for ( ; to_stat < to_stat_last ; from_stat++, to_stat++)
+      to_stat->aggregate(from_stat);
+
+    /* Aggregate stats for the table */
+    to_stat= & m_index_stat[MAX_INDEXES];
+    from_stat= & stat->m_index_stat[MAX_INDEXES];
+    to_stat->aggregate(from_stat);
+  }
+
+  inline void aggregate_lock(const PFS_table_stat *stat)
+  {
+    m_lock_stat.aggregate(& stat->m_lock_stat);
+  }
+
+  inline void aggregate(const PFS_table_stat *stat, uint key_count)
+  {
+    aggregate_io(stat, key_count);
+    aggregate_lock(stat);
+  }
+
+  inline void sum_io(PFS_single_stat *result, uint key_count)
+  {
+    PFS_table_io_stat *stat;
+    PFS_table_io_stat *stat_last;
+
+    DBUG_ASSERT(key_count <= MAX_INDEXES);
+
+    /* Sum stats for each index, if any */
+    stat= & m_index_stat[0];
+    stat_last= stat + key_count;
+    for ( ; stat < stat_last ; stat++)
+      stat->sum(result);
+
+    /* Sum stats for the table */
+    m_index_stat[MAX_INDEXES].sum(result);
+  }
+
+  inline void sum_lock(PFS_single_stat *result)
+  {
+    m_lock_stat.sum(result);
+  }
+
+  inline void sum(PFS_single_stat *result, uint key_count)
+  {
+    sum_io(result, key_count);
+    sum_lock(result);
+  }
+
+  static struct PFS_table_stat g_reset_template;
+};
+
+/** Statistics for SOCKET IO. Used for both waits and byte counts. */
+struct PFS_socket_io_stat
+{
+  /** READ statistics */
+  PFS_byte_stat m_read;
+  /** WRITE statistics */
+  PFS_byte_stat m_write;
+  /** Miscellaneous statistics */
+  PFS_byte_stat m_misc;
+
+  inline void reset(void)
+  {
+    m_read.reset();
+    m_write.reset();
+    m_misc.reset();
+  }
+
+  inline void aggregate(const PFS_socket_io_stat *stat)
+  {
+    m_read.aggregate(&stat->m_read);
+    m_write.aggregate(&stat->m_write);
+    m_misc.aggregate(&stat->m_misc);
+  }
+
+  /* Sum waits and byte counts */
+  inline void sum(PFS_byte_stat *stat)
+  {
+    stat->aggregate(&m_read);
+    stat->aggregate(&m_write);
+    stat->aggregate(&m_misc);
+  }
+
+  /* Sum waits only */
+  inline void sum_waits(PFS_single_stat *stat)
+  {
+    stat->aggregate(&m_read);
+    stat->aggregate(&m_write);
+    stat->aggregate(&m_misc);
+  }
+};
+
+/** Statistics for SOCKET usage. */
+struct PFS_socket_stat
+{
+  /** Socket timing and byte count statistics per operation */
+  PFS_socket_io_stat m_io_stat;
+
+  /** Reset socket statistics. */
+  inline void reset(void)
+  {
+    m_io_stat.reset();
+  }
+};
+
+struct PFS_memory_stat_delta
+{
+  size_t m_alloc_count_delta;
+  size_t m_free_count_delta;
+  size_t m_alloc_size_delta;
+  size_t m_free_size_delta;
+
+  void reset()
+  {
+    m_alloc_count_delta= 0;
+    m_free_count_delta= 0;
+    m_alloc_size_delta= 0;
+    m_free_size_delta= 0;
+  }
+};
+
+/**
+  Memory statistics.
+  Conceptually, the following statistics are maintained:
+  - CURRENT_COUNT_USED,
+  - LOW_COUNT_USED,
+  - HIGH_COUNT_USED
+  - CURRENT_SIZE_USED,
+  - LOW_SIZE_USED,
+  - HIGH_SIZE_USED
+  Now, the implementation keeps different counters,
+  which are easier (less overhead) to maintain while
+  collecting statistics.
+  Invariants are as follows:
+  CURRENT_COUNT_USED = @c m_alloc_count - @c m_free_count
+  LOW_COUNT_USED + @c m_free_count_capacity = CURRENT_COUNT_USED
+  CURRENT_COUNT_USED + @c m_alloc_count_capacity = HIGH_COUNT_USED
+  CURRENT_SIZE_USED = @c m_alloc_size - @c m_free_size
+  LOW_SIZE_USED + @c m_free_size_capacity = CURRENT_SIZE_USED
+  CURRENT_SIZE_USED + @c m_alloc_size_capacity = HIGH_SIZE_USED
+
+*/
+struct PFS_memory_stat
+{
+  bool m_used;
+  size_t m_alloc_count;
+  size_t m_free_count;
+  size_t m_alloc_size;
+  size_t m_free_size;
+
+  size_t m_alloc_count_capacity;
+  size_t m_free_count_capacity;
+  size_t m_alloc_size_capacity;
+  size_t m_free_size_capacity;
+
+  inline void reset(void)
+  {
+    m_used= false;
+    m_alloc_count= 0;
+    m_free_count= 0;
+    m_alloc_size= 0;
+    m_free_size= 0;
+
+    m_alloc_count_capacity= 0;
+    m_free_count_capacity= 0;
+    m_alloc_size_capacity= 0;
+    m_free_size_capacity= 0;
+  }
+
+  inline void rebase(void)
+  {
+    if (! m_used)
+      return;
+
+    size_t base;
+
+    base= std::min<size_t>(m_alloc_count, m_free_count);
+    m_alloc_count-= base;
+    m_free_count-= base;
+
+    base= std::min<size_t>(m_alloc_size, m_free_size);
+    m_alloc_size-= base;
+    m_free_size-= base;
+
+    m_alloc_count_capacity= 0;
+    m_free_count_capacity= 0;
+    m_alloc_size_capacity= 0;
+    m_free_size_capacity= 0;
+  }
+
+  inline void partial_aggregate_to(PFS_memory_stat *stat)
+  {
+    if (! m_used)
+      return;
+
+    size_t base;
+
+    stat->m_used= true;
+
+    base= std::min<size_t>(m_alloc_count, m_free_count);
+    if (base != 0)
+    {
+      stat->m_alloc_count+= base;
+      stat->m_free_count+= base;
+      m_alloc_count-= base;
+      m_free_count-= base;
+    }
+
+    base= std::min<size_t>(m_alloc_size, m_free_size);
+    if (base != 0)
+    {
+      stat->m_alloc_size+= base;
+      stat->m_free_size+= base;
+      m_alloc_size-= base;
+      m_free_size-= base;
+    }
+
+    stat->m_alloc_count_capacity+= m_alloc_count_capacity;
+    stat->m_free_count_capacity+= m_free_count_capacity;
+    stat->m_alloc_size_capacity+= m_alloc_size_capacity;
+    stat->m_free_size_capacity+= m_free_size_capacity;
+
+    m_alloc_count_capacity= 0;
+    m_free_count_capacity= 0;
+    m_alloc_size_capacity= 0;
+    m_free_size_capacity= 0;
+  }
+
+  inline void full_aggregate_to(PFS_memory_stat *stat) const
+  {
+    if (! m_used)
+      return;
+
+    stat->m_used= true;
+
+    stat->m_alloc_count+= m_alloc_count;
+    stat->m_free_count+= m_free_count;
+    stat->m_alloc_size+= m_alloc_size;
+    stat->m_free_size+= m_free_size;
+
+    stat->m_alloc_count_capacity+= m_alloc_count_capacity;
+    stat->m_free_count_capacity+= m_free_count_capacity;
+    stat->m_alloc_size_capacity+= m_alloc_size_capacity;
+    stat->m_free_size_capacity+= m_free_size_capacity;
+  }
+
+  inline void partial_aggregate_to(PFS_memory_stat *stat1, PFS_memory_stat *stat2)
+  {
+    if (! m_used)
+      return;
+
+    size_t base;
+
+    stat1->m_used= true;
+    stat2->m_used= true;
+
+    base= std::min<size_t>(m_alloc_count, m_free_count);
+    if (base != 0)
+    {
+      stat1->m_alloc_count+= base;
+      stat2->m_alloc_count+= base;
+      stat1->m_free_count+= base;
+      stat2->m_free_count+= base;
+      m_alloc_count-= base;
+      m_free_count-= base;
+    }
+
+    base= std::min<size_t>(m_alloc_size, m_free_size);
+    if (base != 0)
+    {
+      stat1->m_alloc_size+= base;
+      stat2->m_alloc_size+= base;
+      stat1->m_free_size+= base;
+      stat2->m_free_size+= base;
+      m_alloc_size-= base;
+      m_free_size-= base;
+    }
+
+    stat1->m_alloc_count_capacity+= m_alloc_count_capacity;
+    stat2->m_alloc_count_capacity+= m_alloc_count_capacity;
+    stat1->m_free_count_capacity+= m_free_count_capacity;
+    stat2->m_free_count_capacity+= m_free_count_capacity;
+    stat1->m_alloc_size_capacity+= m_alloc_size_capacity;
+    stat2->m_alloc_size_capacity+= m_alloc_size_capacity;
+    stat1->m_free_size_capacity+= m_free_size_capacity;
+    stat2->m_free_size_capacity+= m_free_size_capacity;
+
+    m_alloc_count_capacity= 0;
+    m_free_count_capacity= 0;
+    m_alloc_size_capacity= 0;
+    m_free_size_capacity= 0;
+  }
+
+  inline void full_aggregate_to(PFS_memory_stat *stat1, PFS_memory_stat *stat2) const
+  {
+    if (! m_used)
+      return;
+
+    stat1->m_used= true;
+    stat2->m_used= true;
+
+    stat1->m_alloc_count+= m_alloc_count;
+    stat2->m_alloc_count+= m_alloc_count;
+    stat1->m_free_count+= m_free_count;
+    stat2->m_free_count+= m_free_count;
+    stat1->m_alloc_size+= m_alloc_size;
+    stat2->m_alloc_size+= m_alloc_size;
+    stat1->m_free_size+= m_free_size;
+    stat2->m_free_size+= m_free_size;
+
+    stat1->m_alloc_count_capacity+= m_alloc_count_capacity;
+    stat2->m_alloc_count_capacity+= m_alloc_count_capacity;
+    stat1->m_free_count_capacity+= m_free_count_capacity;
+    stat2->m_free_count_capacity+= m_free_count_capacity;
+    stat1->m_alloc_size_capacity+= m_alloc_size_capacity;
+    stat2->m_alloc_size_capacity+= m_alloc_size_capacity;
+    stat1->m_free_size_capacity+= m_free_size_capacity;
+    stat2->m_free_size_capacity+= m_free_size_capacity;
+  }
+
+  void count_builtin_alloc(size_t size)
+  {
+    m_used= true;
+
+    m_alloc_count++;
+    m_free_count_capacity++;
+    m_alloc_size+= size;
+    m_free_size_capacity+= size;
+
+    if (m_alloc_count_capacity >= 1)
+    {
+      m_alloc_count_capacity--;
+    }
+
+    if (m_alloc_size_capacity >= size)
+    {
+      m_alloc_size_capacity-= size;
+    }
+
+    return;
+  }
+
+  void count_builtin_free(size_t size)
+  {
+    m_used= true;
+
+    m_free_count++;
+    m_alloc_count_capacity++;
+    m_free_size+= size;
+    m_alloc_size_capacity+= size;
+
+    if (m_free_count_capacity >= 1)
+    {
+      m_free_count_capacity--;
+    }
+
+    if (m_free_size_capacity >= size)
+    {
+      m_free_size_capacity-= size;
+    }
+
+    return;
+  }
+
+  inline PFS_memory_stat_delta *count_alloc(size_t size,
+                                            PFS_memory_stat_delta *delta)
+  {
+    m_used= true;
+
+    m_alloc_count++;
+    m_free_count_capacity++;
+    m_alloc_size+= size;
+    m_free_size_capacity+= size;
+
+    if ((m_alloc_count_capacity >= 1) &&
+        (m_alloc_size_capacity >= size))
+    {
+      m_alloc_count_capacity--;
+      m_alloc_size_capacity-= size;
+      return NULL;
+    }
+
+    delta->reset();
+
+    if (m_alloc_count_capacity >= 1)
+    {
+      m_alloc_count_capacity--;
+    }
+    else
+    {
+      delta->m_alloc_count_delta= 1;
+    }
+
+    if (m_alloc_size_capacity >= size)
+    {
+      m_alloc_size_capacity-= size;
+    }
+    else
+    {
+      delta->m_alloc_size_delta= size - m_alloc_size_capacity;
+      m_alloc_size_capacity= 0;
+    }
+
+    return delta;
+  }
+
+  inline PFS_memory_stat_delta *count_realloc(size_t old_size, size_t new_size,
+                                              PFS_memory_stat_delta *delta)
+  {
+    m_used= true;
+
+    size_t size_delta= new_size - old_size;
+    m_alloc_count++;
+    m_alloc_size+= new_size;
+    m_free_count++;
+    m_free_size+= old_size;
+
+    if (new_size == old_size)
+    {
+      return NULL;
+    }
+
+    if (new_size > old_size)
+    {
+      /* Growing */
+      size_delta= new_size - old_size;
+      m_free_size_capacity+= size_delta;
+
+      if (m_alloc_size_capacity >= size_delta)
+      {
+        m_alloc_size_capacity-= size_delta;
+        return NULL;
+      }
+
+      delta->reset();
+      delta->m_alloc_size_delta= size_delta - m_alloc_size_capacity;
+      m_alloc_size_capacity= 0;
+    }
+    else
+    {
+      /* Shrinking */
+      size_delta= old_size - new_size;
+      m_alloc_size_capacity+= size_delta;
+
+      if (m_free_size_capacity >= size_delta)
+      {
+        m_free_size_capacity-= size_delta;
+        return NULL;
+      }
+
+      delta->reset();
+      delta->m_free_size_delta= size_delta - m_free_size_capacity;
+      m_free_size_capacity= 0;
+    }
+
+    return delta;
+  }
+
+  inline PFS_memory_stat_delta *count_free(size_t size, PFS_memory_stat_delta *delta)
+  {
+    m_used= true;
+
+    m_free_count++;
+    m_alloc_count_capacity++;
+    m_free_size+= size;
+    m_alloc_size_capacity+= size;
+
+    if ((m_free_count_capacity >= 1) &&
+        (m_free_size_capacity >= size))
+    {
+      m_free_count_capacity--;
+      m_free_size_capacity-= size;
+      return NULL;
+    }
+
+    delta->reset();
+
+    if (m_free_count_capacity >= 1)
+    {
+      m_free_count_capacity--;
+    }
+    else
+    {
+      delta->m_free_count_delta= 1;
+    }
+
+    if (m_free_size_capacity >= size)
+    {
+      m_free_size_capacity-= size;
+    }
+    else
+    {
+      delta->m_free_size_delta= size - m_free_size_capacity;
+      m_free_size_capacity= 0;
+    }
+
+    return delta;
+  }
+
+  inline PFS_memory_stat_delta *apply_delta(const PFS_memory_stat_delta *delta,
+                                            PFS_memory_stat_delta *delta_buffer)
+  {
+    size_t val;
+    size_t remaining_alloc_count;
+    size_t remaining_alloc_size;
+    size_t remaining_free_count;
+    size_t remaining_free_size;
+    bool has_remaining= false;
+
+    m_used= true;
+
+    val= delta->m_alloc_count_delta;
+    if (val <= m_alloc_count_capacity)
+    {
+      m_alloc_count_capacity-= val;
+      remaining_alloc_count= 0;
+    }
+    else
+    {
+      remaining_alloc_count= val - m_alloc_count_capacity;
+      m_alloc_count_capacity= 0;
+      has_remaining= true;
+    }
+
+    val= delta->m_alloc_size_delta;
+    if (val <= m_alloc_size_capacity)
+    {
+      m_alloc_size_capacity-= val;
+      remaining_alloc_size= 0;
+    }
+    else
+    {
+      remaining_alloc_size= val - m_alloc_size_capacity;
+      m_alloc_size_capacity= 0;
+      has_remaining= true;
+    }
+
+    val= delta->m_free_count_delta;
+    if (val <= m_free_count_capacity)
+    {
+      m_free_count_capacity-= val;
+      remaining_free_count= 0;
+    }
+    else
+    {
+      remaining_free_count= val - m_free_count_capacity;
+      m_free_count_capacity= 0;
+      has_remaining= true;
+    }
+
+    val= delta->m_free_size_delta;
+    if (val <= m_free_size_capacity)
+    {
+      m_free_size_capacity-= val;
+      remaining_free_size= 0;
+    }
+    else
+    {
+      remaining_free_size= val - m_free_size_capacity;
+      m_free_size_capacity= 0;
+      has_remaining= true;
+    }
+
+    if (! has_remaining)
+      return NULL;
+
+    delta_buffer->m_alloc_count_delta= remaining_alloc_count;
+    delta_buffer->m_alloc_size_delta= remaining_alloc_size;
+    delta_buffer->m_free_count_delta= remaining_free_count;
+    delta_buffer->m_free_size_delta= remaining_free_size;
+    return delta_buffer;
+  }
+};
+
+#define PFS_MEMORY_STAT_INITIALIZER { false, 0, 0, 0, 0, 0, 0, 0, 0}
+
+/** Connections statistics. */
+struct PFS_connection_stat
+{
+  PFS_connection_stat()
+  : m_current_connections(0),
+    m_total_connections(0)
+  {}
+
+  ulonglong m_current_connections;
+  ulonglong m_total_connections;
+
+  inline void aggregate_active(ulonglong active)
+  {
+    m_current_connections+= active;
+    m_total_connections+= active;
+  }
+
+  inline void aggregate_disconnected(ulonglong disconnected)
+  {
+    m_total_connections+= disconnected;
+  }
+};
+
+/** @} */
+#endif
+