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/*****************************************************************************
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 Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
#ifndef mariadb_stats_h
#define mariadb_stats_h
/* Include file to handle mariadbd handler specific stats */
#include "ha_handler_stats.h"
#include "my_rdtsc.h"
/* Not active threads are ponting to this structure */
extern thread_local ha_handler_stats mariadb_dummy_stats;
/* Points to either THD->handler_stats or mariad_dummy_stats */
extern thread_local ha_handler_stats *mariadb_stats;
/*
Returns 1 if MariaDB wants engine status
*/
inline bool mariadb_stats_active()
{
return mariadb_stats->active != 0;
}
inline bool mariadb_stats_active(ha_handler_stats *stats)
{
return stats->active != 0;
}
/* The following functions increment different engine status */
inline void mariadb_increment_pages_accessed()
{
mariadb_stats->pages_accessed++;
}
inline void mariadb_increment_pages_updated(ulonglong count)
{
mariadb_stats->pages_updated+= count;
}
inline void mariadb_increment_pages_read()
{
mariadb_stats->pages_read_count++;
}
inline void mariadb_increment_undo_records_read()
{
mariadb_stats->undo_records_read++;
}
/*
The following has to be identical code as measure() in sql_analyze_stmt.h
One should only call this if mariadb_stats_active() is true.
*/
inline ulonglong mariadb_measure()
{
#if (MY_TIMER_ROUTINE_CYCLES)
return my_timer_cycles();
#else
return my_timer_microseconds();
#endif
}
/*
Call this only of start_time != 0
See buf0rea.cc for an example of how to use it efficiently
*/
inline void mariadb_increment_pages_read_time(ulonglong start_time)
{
ha_handler_stats *stats= mariadb_stats;
ulonglong end_time= mariadb_measure();
/* Check that we only call this if active, see example! */
DBUG_ASSERT(start_time);
DBUG_ASSERT(mariadb_stats_active(stats));
stats->pages_read_time+= (end_time - start_time);
}
/*
Helper class to set mariadb_stats temporarly for one call in handler.cc
*/
class mariadb_set_stats
{
public:
uint flag;
mariadb_set_stats(ha_handler_stats *stats)
{
mariadb_stats= stats ? stats : &mariadb_dummy_stats;
}
~mariadb_set_stats()
{
mariadb_stats= &mariadb_dummy_stats;
}
};
#endif /* mariadb_stats_h */
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