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[perf] Switch to using clock_gettime()

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Try using clock_gettime() for a high resolution stable time source in
preference to the potentially unstable TSC.
This commit is contained in:
Chris Wilson 2009-06-06 13:32:21 +01:00
parent 867c88ae90
commit 4ccfd474a3
2 changed files with 60 additions and 21 deletions
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9
build/configure.ac.system
View file

@ -60,8 +60,13 @@ dnl Check for socket support for any2ppm daemon
AC_CHECK_HEADERS([fcntl.h unistd.h signal.h sys/stat.h sys/socket.h sys/poll.h sys/un.h])
dnl check for CPU affinity support
AC_CHECK_HEADERS([sched.h],
[AC_CHECK_FUNCS([sched_getaffinity])])
AC_CHECK_HEADERS([sched.h], [AC_CHECK_FUNCS([sched_getaffinity])])
dnl check for clock_gettime() support
save_LIBS="$LIBS"
LIBS="$LIBS $RT_LIBS"
AC_CHECK_HEADERS([time.h], [AC_CHECK_FUNCS([clock_gettime])])
LIBS="$save_LIBS"
dnl check for GNU-extensions to fenv
AC_CHECK_HEADER(fenv.h,

72
perf/cairo-perf-posix.c
View file

@ -55,7 +55,10 @@
#define _XOPEN_SOURCE 600 /* for round() */
#include "config.h"
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#ifdef _POSIX_PRIORITY_SCHEDULING
@ -66,13 +69,22 @@
/* timers */
#if defined(HAVE_CLOCK_GETTIME)
#if defined(CLOCK_MONOTONIC_RAW)
#define CLOCK CLOCK_MONOTONIC_RAW
#elif defined(CLOCK_MONOTONIC)
#define CLOCK CLOCK_MONOTONIC
#endif
#endif
#if ! defined(CLOCK)
#if defined(__i386__) || defined(__amd64__)
static inline cairo_perf_ticks_t
oil_profile_stamp_rdtsc (void)
{
unsigned a, d;
__asm__ __volatile__("rdtsc" : "=a" (a), "=d" (d));
return ((uint64_t)a) | (((uint64_t)d) << 32);
unsigned a, d;
__asm__ __volatile__("rdtsc" : "=a" (a), "=d" (d));
return ((uint64_t)a) | (((uint64_t)d) << 32);
}
#define OIL_STAMP oil_profile_stamp_rdtsc
#endif
@ -118,10 +130,13 @@ oil_profile_stamp_s390(void)
}
#define OIL_STAMP oil_profile_stamp_s390
#endif
#endif
typedef struct _cairo_perf_timer
{
#ifdef OIL_STAMP
typedef struct _cairo_perf_timer {
#if defined(CLOCK)
struct timespec tv_start;
struct timespec tv_stop;
#elif defined(OIL_STAMP)
cairo_perf_ticks_t start;
cairo_perf_ticks_t stop;
#else
@ -143,10 +158,14 @@ cairo_perf_timer_set_synchronize (cairo_perf_timer_synchronize_t synchronize,
}
void
cairo_perf_timer_start (void) {
cairo_perf_timer_start (void)
{
if (cairo_perf_timer_synchronize)
cairo_perf_timer_synchronize (cairo_perf_timer_synchronize_closure);
#ifdef OIL_STAMP
#if defined(CLOCK)
clock_gettime (CLOCK, &timer.tv_start);
#elif defined(OIL_STAMP)
timer.start = OIL_STAMP ();
#else
gettimeofday (&timer.tv_start, NULL);
@ -154,10 +173,14 @@ cairo_perf_timer_start (void) {
}
void
cairo_perf_timer_stop (void) {
cairo_perf_timer_stop (void)
{
if (cairo_perf_timer_synchronize)
cairo_perf_timer_synchronize (cairo_perf_timer_synchronize_closure);
#ifdef OIL_STAMP
#if defined(CLOCK)
clock_gettime (CLOCK, &timer.tv_stop);
#elif defined(OIL_STAMP)
timer.stop = OIL_STAMP ();
#else
gettimeofday (&timer.tv_stop, NULL);
@ -165,22 +188,32 @@ cairo_perf_timer_stop (void) {
}
cairo_perf_ticks_t
cairo_perf_timer_elapsed (void) {
cairo_perf_timer_elapsed (void)
{
cairo_perf_ticks_t ticks;
#ifdef OIL_STAMP
ticks = (timer.stop - timer.start);
#if defined(CLOCK)
ticks = timer.tv_stop.tv_sec - timer.tv_start.tv_sec;
ticks *= 1000000000;
ticks += timer.tv_stop.tv_nsec - timer.tv_start.tv_nsec;
#elif defined(OIL_STAMP)
ticks = timer.stop - timer.start;
#else
ticks = (timer.tv_stop.tv_sec - timer.tv_start.tv_sec) * 1000000;
ticks += (timer.tv_stop.tv_usec - timer.tv_start.tv_usec);
ticks = timer.tv_stop.tv_sec - timer.tv_start.tv_sec;
ticks *= 1000000;
ticks += timer.tv_stop.tv_usec - timer.tv_start.tv_usec;
#endif
return ticks;
}
cairo_perf_ticks_t
cairo_perf_ticks_per_second (void) {
#ifdef OIL_STAMP
cairo_perf_ticks_per_second (void)
{
#if defined(CLOCK)
/* For clock_gettime() the units are nano-seconds */
return 1000000000;
#elif defined(OIL_STAMP)
static cairo_perf_ticks_t tps = 0;
/* XXX: This is obviously not stable in light of changing CPU speed. */
if (tps == 0) {
@ -197,7 +230,7 @@ cairo_perf_ticks_per_second (void) {
}
return tps;
#else
/* For gettimeofday the units are micro-seconds */
/* For gettimeofday() the units are micro-seconds */
return 1000000;
#endif
}
@ -205,7 +238,8 @@ cairo_perf_ticks_per_second (void) {
/* yield */
void
cairo_perf_yield (void) {
cairo_perf_yield (void)
{
#ifdef _POSIX_PRIORITY_SCHEDULING
sched_yield ();
#endif