142 lines
5.8 KiB
C
Executable File
142 lines
5.8 KiB
C
Executable File
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* high precision timer, useful to profile code
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*/
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#ifndef AVUTIL_TIMER_H
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#define AVUTIL_TIMER_H
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#include "config.h"
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#if CONFIG_LINUX_PERF
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# ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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# endif
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# include <unistd.h> // read(3)
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# include <sys/ioctl.h>
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# include <asm/unistd.h>
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# include <linux/perf_event.h>
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#endif
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#include <stdlib.h>
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#include <stdint.h>
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#include <inttypes.h>
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#if HAVE_MACH_ABSOLUTE_TIME
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#include <mach/mach_time.h>
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#endif
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#include "log.h"
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#if ARCH_AARCH64
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# include "aarch64/timer.h"
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#elif ARCH_ARM
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# include "arm/timer.h"
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#elif ARCH_PPC
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# include "ppc/timer.h"
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#elif ARCH_X86
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# include "x86/timer.h"
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#endif
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#if !defined(AV_READ_TIME)
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# if HAVE_GETHRTIME
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# define AV_READ_TIME gethrtime
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# elif HAVE_MACH_ABSOLUTE_TIME
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# define AV_READ_TIME mach_absolute_time
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# endif
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#endif
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#ifndef FF_TIMER_UNITS
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# define FF_TIMER_UNITS "UNITS"
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#endif
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#define TIMER_REPORT(id, tdiff) \
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{ \
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static uint64_t tsum = 0; \
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static int tcount = 0; \
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static int tskip_count = 0; \
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static int thistogram[32] = {0}; \
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thistogram[av_log2(tdiff)]++; \
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if (tcount < 2 || \
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(tdiff) < 8 * tsum / tcount || \
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(tdiff) < 2000) { \
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tsum += (tdiff); \
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tcount++; \
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} else \
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tskip_count++; \
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if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \
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int i; \
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av_log(NULL, AV_LOG_ERROR, \
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"%7"PRIu64" " FF_TIMER_UNITS " in %s,%8d runs,%7d skips", \
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tsum * 10 / tcount, id, tcount, tskip_count); \
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for (i = 0; i < 32; i++) \
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av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\
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av_log(NULL, AV_LOG_ERROR, "\n"); \
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} \
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}
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#if CONFIG_LINUX_PERF
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#define START_TIMER \
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static int linux_perf_fd; \
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uint64_t tperf; \
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if (!linux_perf_fd) { \
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struct perf_event_attr attr = { \
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.type = PERF_TYPE_HARDWARE, \
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.size = sizeof(struct perf_event_attr), \
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.config = PERF_COUNT_HW_CPU_CYCLES, \
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.disabled = 1, \
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.exclude_kernel = 1, \
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.exclude_hv = 1, \
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}; \
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linux_perf_fd = syscall(__NR_perf_event_open, &attr, \
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0, -1, -1, 0); \
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} \
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if (linux_perf_fd == -1) { \
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av_log(NULL, AV_LOG_ERROR, "perf_event_open failed: %s\n", \
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av_err2str(AVERROR(errno))); \
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} else { \
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ioctl(linux_perf_fd, PERF_EVENT_IOC_RESET, 0); \
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ioctl(linux_perf_fd, PERF_EVENT_IOC_ENABLE, 0); \
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}
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#define STOP_TIMER(id) \
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ioctl(linux_perf_fd, PERF_EVENT_IOC_DISABLE, 0); \
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read(linux_perf_fd, &tperf, sizeof(tperf)); \
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TIMER_REPORT(id, tperf)
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#elif defined(AV_READ_TIME)
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#define START_TIMER \
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uint64_t tend; \
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uint64_t tstart = AV_READ_TIME(); \
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#define STOP_TIMER(id) \
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tend = AV_READ_TIME(); \
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TIMER_REPORT(id, tend - tstart)
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#else
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#define START_TIMER
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#define STOP_TIMER(id) { }
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#endif
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#endif /* AVUTIL_TIMER_H */
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