#include "postgres.h"
#include <math.h>
#include "port/pg_cpu.h"
#include "portability/instr_time.h"

Include dependency graph for instr_time.c:

Functions
static void	set_ticks_per_ns (void)

static void	set_ticks_per_ns_system (void)

void	pg_initialize_timing (void)

bool	pg_set_timing_clock_source (TimingClockSourceType source)

Variables
uint64	ticks_per_ns_scaled = 0

uint64	max_ticks_no_overflow = 0

bool	timing_initialized = false

int	timing_clock_source = TIMING_CLOCK_SOURCE_AUTO

bool	timing_tsc_enabled = false

int32	timing_tsc_frequency_khz = -1

Function Documentation

◆ pg_initialize_timing()

void pg_initialize_timing ( void )

Definition at line 82 of file instr_time.c.

{
    if (timing_initialized)
        return;
 
    set_ticks_per_ns_system();
    timing_initialized = true;
}

References set_ticks_per_ns_system(), and timing_initialized.

Referenced by InitProcessGlobals(), main(), main(), and regression_main().

◆ pg_set_timing_clock_source()

bool pg_set_timing_clock_source ( TimingClockSourceType source )

Definition at line 92 of file instr_time.c.

{
    Assert(timing_initialized);
 
#if PG_INSTR_TSC_CLOCK
    pg_initialize_timing_tsc();
 
    switch (source)
    {
        case TIMING_CLOCK_SOURCE_AUTO:
            timing_tsc_enabled = (timing_tsc_frequency_khz > 0) && tsc_use_by_default();
            break;
        case TIMING_CLOCK_SOURCE_SYSTEM:
            timing_tsc_enabled = false;
            break;
        case TIMING_CLOCK_SOURCE_TSC:
            /* Tell caller TSC is not usable */
            if (timing_tsc_frequency_khz <= 0)
                return false;
            timing_tsc_enabled = true;
            break;
    }
#endif
 
    set_ticks_per_ns();
    timing_clock_source = source;
    return true;
}

References Assert, fb(), set_ticks_per_ns(), source, timing_clock_source, TIMING_CLOCK_SOURCE_AUTO, TIMING_CLOCK_SOURCE_SYSTEM, timing_initialized, timing_tsc_enabled, and timing_tsc_frequency_khz.

Referenced by assign_timing_clock_source(), and test_timing().

◆ set_ticks_per_ns()

static void set_ticks_per_ns ( void )

static

Definition at line 122 of file instr_time.c.

{
#if PG_INSTR_TSC_CLOCK
    if (timing_tsc_enabled)
    {
        set_ticks_per_ns_for_tsc();
        return;
    }
#endif
    set_ticks_per_ns_system();
}

References fb(), set_ticks_per_ns_system(), and timing_tsc_enabled.

Referenced by pg_set_timing_clock_source().

◆ set_ticks_per_ns_system()

static void set_ticks_per_ns_system ( void )

static

Definition at line 137 of file instr_time.c.

{
    ticks_per_ns_scaled = 0;
    max_ticks_no_overflow = 0;
}

References max_ticks_no_overflow, and ticks_per_ns_scaled.

Referenced by pg_initialize_timing(), and set_ticks_per_ns().

Variable Documentation

◆ max_ticks_no_overflow

uint64 max_ticks_no_overflow = 0

Definition at line 62 of file instr_time.c.

Referenced by pg_ticks_to_ns(), and set_ticks_per_ns_system().

◆ ticks_per_ns_scaled

uint64 ticks_per_ns_scaled = 0

Definition at line 61 of file instr_time.c.

Referenced by pg_ns_to_ticks(), pg_ticks_to_ns(), set_ticks_per_ns_system(), and test_instr_time().

◆ timing_clock_source

int timing_clock_source = TIMING_CLOCK_SOURCE_AUTO

Definition at line 64 of file instr_time.c.

Referenced by pg_set_timing_clock_source(), and show_timing_clock_source().

◆ timing_initialized

bool timing_initialized = false

Definition at line 63 of file instr_time.c.

Referenced by assign_timing_clock_source(), check_timing_clock_source(), pg_get_ticks_system(), pg_initialize_timing(), pg_ns_to_ticks(), pg_set_timing_clock_source(), and pg_ticks_to_ns().

◆ timing_tsc_enabled

bool timing_tsc_enabled = false

Definition at line 66 of file instr_time.c.

Referenced by pg_current_timing_clock_source(), pg_set_timing_clock_source(), and set_ticks_per_ns().

◆ timing_tsc_frequency_khz

int32 timing_tsc_frequency_khz = -1

Definition at line 67 of file instr_time.c.

Referenced by check_timing_clock_source(), and pg_set_timing_clock_source().

Functions

Variables