1/* 2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * high precision timer, useful to profile code 24 */ 25 26#ifndef AVUTIL_TIMER_H 27#define AVUTIL_TIMER_H 28 29#include "config.h" 30 31#if CONFIG_LINUX_PERF 32# ifndef _GNU_SOURCE 33# define _GNU_SOURCE 34# endif 35# include <unistd.h> // read(3) 36# include <sys/ioctl.h> 37# include <asm/unistd.h> 38# include <linux/perf_event.h> 39#endif 40 41#include <stdlib.h> 42#include <stdint.h> 43#include <inttypes.h> 44 45#if CONFIG_MACOS_KPERF 46#include "macos_kperf.h" 47#elif HAVE_MACH_ABSOLUTE_TIME 48#include <mach/mach_time.h> 49#endif 50 51#include "common.h" 52#include "log.h" 53 54#if ARCH_AARCH64 55# include "aarch64/timer.h" 56#elif ARCH_ARM 57# include "arm/timer.h" 58#elif ARCH_PPC 59# include "ppc/timer.h" 60#elif ARCH_X86 61# include "x86/timer.h" 62#endif 63 64#if !defined(AV_READ_TIME) 65# if HAVE_GETHRTIME 66# define AV_READ_TIME gethrtime 67# elif HAVE_MACH_ABSOLUTE_TIME 68# define AV_READ_TIME mach_absolute_time 69# endif 70#endif 71 72#ifndef FF_TIMER_UNITS 73# define FF_TIMER_UNITS "UNITS" 74#endif 75 76#define TIMER_REPORT(id, tdiff) \ 77 { \ 78 static uint64_t tsum = 0; \ 79 static int tcount = 0; \ 80 static int tskip_count = 0; \ 81 static int thistogram[32] = {0}; \ 82 thistogram[av_log2(tdiff)]++; \ 83 if (tcount < 2 || \ 84 (tdiff) < 8 * tsum / tcount || \ 85 (tdiff) < 2000) { \ 86 tsum += (tdiff); \ 87 tcount++; \ 88 } else \ 89 tskip_count++; \ 90 if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \ 91 int i; \ 92 av_log(NULL, AV_LOG_ERROR, \ 93 "%7" PRIu64 " " FF_TIMER_UNITS " in %s,%8d runs,%7d skips",\ 94 tsum * 10 / tcount, id, tcount, tskip_count); \ 95 for (i = 0; i < 32; i++) \ 96 av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\ 97 av_log(NULL, AV_LOG_ERROR, "\n"); \ 98 } \ 99 } 100 101#if CONFIG_LINUX_PERF 102 103#define START_TIMER \ 104 static int linux_perf_fd; \ 105 uint64_t tperf; \ 106 if (!linux_perf_fd) { \ 107 struct perf_event_attr attr = { \ 108 .type = PERF_TYPE_HARDWARE, \ 109 .size = sizeof(struct perf_event_attr), \ 110 .config = PERF_COUNT_HW_CPU_CYCLES, \ 111 .disabled = 1, \ 112 .exclude_kernel = 1, \ 113 .exclude_hv = 1, \ 114 }; \ 115 linux_perf_fd = syscall(__NR_perf_event_open, &attr, \ 116 0, -1, -1, 0); \ 117 } \ 118 if (linux_perf_fd == -1) { \ 119 av_log(NULL, AV_LOG_ERROR, "perf_event_open failed: %s\n", \ 120 av_err2str(AVERROR(errno))); \ 121 } else { \ 122 ioctl(linux_perf_fd, PERF_EVENT_IOC_RESET, 0); \ 123 ioctl(linux_perf_fd, PERF_EVENT_IOC_ENABLE, 0); \ 124 } 125 126#define STOP_TIMER(id) \ 127 ioctl(linux_perf_fd, PERF_EVENT_IOC_DISABLE, 0); \ 128 read(linux_perf_fd, &tperf, sizeof(tperf)); \ 129 TIMER_REPORT(id, tperf) 130 131#elif CONFIG_MACOS_KPERF 132 133#define START_TIMER \ 134 uint64_t tperf; \ 135 ff_kperf_init(); \ 136 tperf = ff_kperf_cycles(); 137 138#define STOP_TIMER(id) \ 139 TIMER_REPORT(id, ff_kperf_cycles() - tperf); 140 141#elif defined(AV_READ_TIME) 142#define START_TIMER \ 143 uint64_t tend; \ 144 uint64_t tstart = AV_READ_TIME(); \ 145 146#define STOP_TIMER(id) \ 147 tend = AV_READ_TIME(); \ 148 TIMER_REPORT(id, tend - tstart) 149#else 150#define START_TIMER 151#define STOP_TIMER(id) { } 152#endif 153 154#endif /* AVUTIL_TIMER_H */ 155