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/* Copyright (c) 2008 MySQL AB, 2010 Sun Microsystems, Inc.
Use is subject to license terms.
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,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
/**
@file storage/perfschema/pfs_timer.cc
Performance schema timers (implementation).
*/
#include "my_global.h"
#include "pfs_timer.h"
#include "my_rdtsc.h"
enum_timer_name wait_timer= TIMER_NAME_CYCLE;
MY_TIMER_INFO pfs_timer_info;
static ulonglong cycle_v0;
static ulonglong nanosec_v0;
static ulonglong microsec_v0;
static ulonglong millisec_v0;
static ulonglong tick_v0;
static ulong cycle_to_pico; /* 1000 at 1 GHz, 333 at 3GHz, 250 at 4GHz */
static ulong nanosec_to_pico; /* In theory, 1 000 */
static ulong microsec_to_pico; /* In theory, 1 000 000 */
static ulong millisec_to_pico; /* In theory, 1 000 000 000, fits in uint32 */
static ulonglong tick_to_pico; /* 1e10 at 100 Hz, 1.666e10 at 60 Hz */
static inline ulong round_to_ulong(double value)
{
return (ulong) (value + 0.5);
}
static inline ulonglong round_to_ulonglong(double value)
{
return (ulonglong) (value + 0.5);
}
void init_timers(void)
{
double pico_frequency= 1.0e12;
my_timer_init(&pfs_timer_info);
cycle_v0= my_timer_cycles();
nanosec_v0= my_timer_nanoseconds();
microsec_v0= my_timer_microseconds();
millisec_v0= my_timer_milliseconds();
tick_v0= my_timer_ticks();
if (pfs_timer_info.cycles.frequency > 0)
cycle_to_pico= round_to_ulong(pico_frequency/
(double)pfs_timer_info.cycles.frequency);
else
cycle_to_pico= 0;
if (pfs_timer_info.nanoseconds.frequency > 0)
nanosec_to_pico= round_to_ulong(pico_frequency/
(double)pfs_timer_info.nanoseconds.frequency);
else
nanosec_to_pico= 0;
if (pfs_timer_info.microseconds.frequency > 0)
microsec_to_pico= round_to_ulong(pico_frequency/
(double)pfs_timer_info.microseconds.frequency);
else
microsec_to_pico= 0;
if (pfs_timer_info.milliseconds.frequency > 0)
millisec_to_pico= round_to_ulong(pico_frequency/
(double)pfs_timer_info.milliseconds.frequency);
else
millisec_to_pico= 0;
if (pfs_timer_info.ticks.frequency > 0)
tick_to_pico= round_to_ulonglong(pico_frequency/
(double)pfs_timer_info.ticks.frequency);
else
tick_to_pico= 0;
}
ulonglong get_timer_value(enum_timer_name timer_name)
{
ulonglong result;
switch (timer_name) {
case TIMER_NAME_CYCLE:
result= (my_timer_cycles() - cycle_v0) * cycle_to_pico;
break;
case TIMER_NAME_NANOSEC:
result= (my_timer_nanoseconds() - nanosec_v0) * nanosec_to_pico;
break;
case TIMER_NAME_MICROSEC:
result= (my_timer_microseconds() - microsec_v0) * microsec_to_pico;
break;
case TIMER_NAME_MILLISEC:
result= (my_timer_milliseconds() - millisec_v0) * millisec_to_pico;
break;
case TIMER_NAME_TICK:
result= (my_timer_ticks() - tick_v0) * tick_to_pico;
break;
default:
result= 0;
DBUG_ASSERT(false);
}
return result;
}
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