name : 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 */