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 HAVE_MACH_ABSOLUTE_TIME 46 #include <mach/mach_time.h> 47 #endif 48 49 #include "log.h" 50 51 #if ARCH_AARCH64 52 # include "aarch64/timer.h" 53 #elif ARCH_ARM 54 # include "arm/timer.h" 55 #elif ARCH_PPC 56 # include "ppc/timer.h" 57 #elif ARCH_X86 58 # include "x86/timer.h" 59 #endif 60 61 #if !defined(AV_READ_TIME) 62 # if HAVE_GETHRTIME 63 # define AV_READ_TIME gethrtime 64 # elif HAVE_MACH_ABSOLUTE_TIME 65 # define AV_READ_TIME mach_absolute_time 66 # endif 67 #endif 68 69 #ifndef FF_TIMER_UNITS 70 # define FF_TIMER_UNITS "UNITS" 71 #endif 72 73 #define TIMER_REPORT(id, tdiff) \ 74 { \ 75 static uint64_t tsum = 0; \ 76 static int tcount = 0; \ 77 static int tskip_count = 0; \ 78 static int thistogram[32] = {0}; \ 79 thistogram[av_log2(tdiff)]++; \ 80 if (tcount < 2 || \ 81 (tdiff) < 8 * tsum / tcount || \ 82 (tdiff) < 2000) { \ 83 tsum += (tdiff); \ 84 tcount++; \ 85 } else \ 86 tskip_count++; \ 87 if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \ 88 int i; \ 89 av_log(NULL, AV_LOG_ERROR, \ 90 "%7" PRIu64 " " FF_TIMER_UNITS " in %s,%8d runs,%7d skips",\ 91 tsum * 10 / tcount, id, tcount, tskip_count); \ 92 for (i = 0; i < 32; i++) \ 93 av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\ 94 av_log(NULL, AV_LOG_ERROR, "\n"); \ 95 } \ 96 } 97 98 #if CONFIG_LINUX_PERF 99 100 #define START_TIMER \ 101 static int linux_perf_fd; \ 102 uint64_t tperf; \ 103 if (!linux_perf_fd) { \ 104 struct perf_event_attr attr = { \ 105 .type = PERF_TYPE_HARDWARE, \ 106 .size = sizeof(struct perf_event_attr), \ 107 .config = PERF_COUNT_HW_CPU_CYCLES, \ 108 .disabled = 1, \ 109 .exclude_kernel = 1, \ 110 .exclude_hv = 1, \ 111 }; \ 112 linux_perf_fd = syscall(__NR_perf_event_open, &attr, \ 113 0, -1, -1, 0); \ 114 } \ 115 if (linux_perf_fd == -1) { \ 116 av_log(NULL, AV_LOG_ERROR, "perf_event_open failed: %s\n", \ 117 av_err2str(AVERROR(errno))); \ 118 } else { \ 119 ioctl(linux_perf_fd, PERF_EVENT_IOC_RESET, 0); \ 120 ioctl(linux_perf_fd, PERF_EVENT_IOC_ENABLE, 0); \ 121 } 122 123 #define STOP_TIMER(id) \ 124 ioctl(linux_perf_fd, PERF_EVENT_IOC_DISABLE, 0); \ 125 read(linux_perf_fd, &tperf, sizeof(tperf)); \ 126 TIMER_REPORT(id, tperf) 127 128 #elif defined(AV_READ_TIME) 129 #define START_TIMER \ 130 uint64_t tend; \ 131 uint64_t tstart = AV_READ_TIME(); \ 132 133 #define STOP_TIMER(id) \ 134 tend = AV_READ_TIME(); \ 135 TIMER_REPORT(id, tend - tstart) 136 #else 137 #define START_TIMER 138 #define STOP_TIMER(id) { } 139 #endif 140 141 #endif /* AVUTIL_TIMER_H */ 142