Current File : //usr/include/mysql/server/private/ha_handler_stats.h
#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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