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Diffstat (limited to 'storage/xtradb/ut/ut0timer.cc')
| -rw-r--r-- | storage/xtradb/ut/ut0timer.cc | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/storage/xtradb/ut/ut0timer.cc b/storage/xtradb/ut/ut0timer.cc new file mode 100644 index 00000000000..85292cce28c --- /dev/null +++ b/storage/xtradb/ut/ut0timer.cc @@ -0,0 +1,92 @@ +/***************************************************************************** + +Copyright (c) 2013, 2014, Facebook, Inc. All Rights Reserved. +Copyright (c) 2014, SkySQL Ab. 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 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, Suite 500, Boston, MA 02110-1335 USA + +*****************************************************************************/ + +/********************************************************************//** +@file ut/ut0timer.cc +Timer rountines + +Created 30/07/2014 Jan Lindström jan.lindstrom@skysql.com +modified from https://github.com/facebook/mysql-5.6/commit/c75a413edeb96eb99bf11d7269bdfea06f96d6b6 +*************************************************************************/ + +#include "data0type.h" +#include <my_rdtsc.h> +#include <ut0timer.h> + +/**************************************************************//** +Initial timer definition +@return 0 */ +static +ulonglong +ut_timer_none(void) +/*===============*/ +{ + return 0; +} + +/**************************************************************//** +Function pointer to point selected timer function. +@return timer current value */ +ulonglong (*ut_timer_now)(void) = &ut_timer_none; + +struct my_timer_unit_info ut_timer; + +/**************************************************************//** +Sets up the data required for use of my_timer_* functions. +Selects the best timer by high frequency, and tight resolution. +Points my_timer_now() to the selected timer function. +Initializes my_timer struct to contain the info for selected timer.*/ +UNIV_INTERN +void +ut_init_timer(void) +/*===============*/ +{ + MY_TIMER_INFO all_timer_info; + my_timer_init(&all_timer_info); + + if (all_timer_info.cycles.frequency > 1000000 && + all_timer_info.cycles.resolution == 1) { + ut_timer = all_timer_info.cycles; + ut_timer_now = &my_timer_cycles; + } else if (all_timer_info.nanoseconds.frequency > 1000000 && + all_timer_info.nanoseconds.resolution == 1) { + ut_timer = all_timer_info.nanoseconds; + ut_timer_now = &my_timer_nanoseconds; + } else if (all_timer_info.microseconds.frequency >= 1000000 && + all_timer_info.microseconds.resolution == 1) { + ut_timer = all_timer_info.microseconds; + ut_timer_now = &my_timer_microseconds; + + } else if (all_timer_info.milliseconds.frequency >= 1000 && + all_timer_info.milliseconds.resolution == 1) { + ut_timer = all_timer_info.milliseconds; + ut_timer_now = &my_timer_milliseconds; + } else if (all_timer_info.ticks.frequency >= 1000 && + /* Will probably be false */ + all_timer_info.ticks.resolution == 1) { + ut_timer = all_timer_info.ticks; + ut_timer_now = &my_timer_ticks; + } else { + /* None are acceptable, so leave it as "None", and fill in struct */ + ut_timer.frequency = 1; /* Avoid div-by-zero */ + ut_timer.overhead = 0; /* Since it doesn't do anything */ + ut_timer.resolution = 10; /* Another sign it's bad */ + ut_timer.routine = 0; /* None */ + } +} |