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Edit File : ha_handler_stats.h \| Size : 2.28 KB
#ifndef HA_HANDLER_STATS_INCLUDED #define HA_HANDLER_STATS_INCLUDED /* Copyright (c) 2023, MariaDB Foundation 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 / / Definitions for parameters to do with handler-routines / class ha_handler_stats { public: ulonglong pages_accessed; / Pages accessed from page cache / ulonglong pages_updated; / Pages changed in page cache / ulonglong pages_read_count; / Pages read from disk / / Time spent reading pages, in timer_tracker_frequency() units / ulonglong pages_read_time; / Number of pages that we've requested to prefetch while running the query. Note that we don't know: - how much time was spent reading these pages (and how to count the time if reading was done in parallel) - whether the pages were read by "us" or somebody else... / ulonglong pages_prefetched; ulonglong undo_records_read; / Time spent in engine, in timer_tracker_frequency() units / ulonglong engine_time; uint active; / <> 0 if status has to be updated / ha_handler_stats() { active= 0; } #define first_stat pages_accessed #define last_stat engine_time inline void reset() { bzero((void) this, sizeof(this)); } inline void add(ha_handler_stats stats) { ulonglong to= &first_stat; ulonglong from= &stats->first_stat; do { (to)+= from++; } while (to++ != &last_stat); } inline bool has_stats() { if (!active) return 0; ulonglong to= &first_stat; do { if (to) return 1; } while (to++ != &last_stat); return 0; } }; #endif /* HA_HANDLER_STATS_INCLUDED */ Back

Edit File : ha_handler_stats.h | Size : 2.28 KB

#ifndef HA_HANDLER_STATS_INCLUDED
#define HA_HANDLER_STATS_INCLUDED
/*
   Copyright (c) 2023, MariaDB Foundation

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
*/

/* Definitions for parameters to do with handler-routines */

class ha_handler_stats
{
public:
  ulonglong pages_accessed;              /* Pages accessed from page cache */
  ulonglong pages_updated;               /* Pages changed in page cache */
  ulonglong pages_read_count;            /* Pages read from disk */

/* Time spent reading pages, in timer_tracker_frequency() units */
  ulonglong pages_read_time;

/* 
    Number of pages that we've requested to prefetch while running the query.
    Note that we don't know:
    - how much time was spent reading these pages (and how to count the time
      if reading was done in parallel)
    - whether the pages were read by "us" or somebody else...
  */
  ulonglong pages_prefetched;

ulonglong undo_records_read;

/* Time spent in engine, in timer_tracker_frequency() units */
  ulonglong engine_time;
  uint      active;                      /* <> 0 if status has to be updated */

ha_handler_stats()
  {
    active= 0;
  }

#define first_stat pages_accessed
#define last_stat  engine_time
  inline void reset()
  {
    bzero((void*) this, sizeof(*this));
  }
  inline void add(ha_handler_stats *stats)
  {
    ulonglong *to= &first_stat;
    ulonglong *from= &stats->first_stat;
    do
    {
      (*to)+= *from++;
    } while (to++ != &last_stat);
  }
  inline bool has_stats()
  {
    if (!active)
      return 0;
    ulonglong *to= &first_stat;
    do
    {
      if (*to)
        return 1;
    } while (to++ != &last_stat);
    return 0;
  }
};
#endif /* HA_HANDLER_STATS_INCLUDED */

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