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
47 #endif
48
49 #if HAVE_MACH_ABSOLUTE_TIME
50 #include <mach/mach_time.h>
51 #elif HAVE_CLOCK_GETTIME
53 #endif
54
57
58 #if ARCH_AARCH64
60 #elif ARCH_ARM
62 #elif ARCH_PPC
64 #elif ARCH_X86
66 #elif ARCH_LOONGARCH
68 #endif
69
70 #if !defined(AV_READ_TIME)
71 # if HAVE_GETHRTIME
72 # define AV_READ_TIME gethrtime
73 # elif HAVE_MACH_ABSOLUTE_TIME
74 # define AV_READ_TIME mach_absolute_time
75 # elif HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
76 static inline int64_t ff_read_time(
void)
77 {
78 struct timespec ts;
79 clock_gettime(CLOCK_MONOTONIC, &ts);
80 return ts.tv_sec * INT64_C(1000000000) + ts.tv_nsec;
81 }
82 # define AV_READ_TIME ff_read_time
83 # define FF_TIMER_UNITS "ns"
84 # endif
85 #endif
86
87 #ifndef FF_TIMER_UNITS
88 # define FF_TIMER_UNITS "UNITS"
89 #endif
90
91 #define TIMER_REPORT(id, tdiff) \
92 { \
93 static uint64_t tsum = 0; \
94 static int tcount = 0; \
95 static int tskip_count = 0; \
96 static int thistogram[32] = {0}; \
97 thistogram[av_log2(tdiff)]++; \
98 if (tcount < 2 || \
99 (tdiff) < 8 * tsum / tcount || \
100 (tdiff) < 2000) { \
101 tsum += (tdiff); \
102 tcount++; \
103 } else \
104 tskip_count++; \
105 if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \
106 int i; \
107 av_log(NULL, AV_LOG_ERROR, \
108 "%7" PRIu64 " " FF_TIMER_UNITS " in %s,%8d runs,%7d skips",\
109 tsum * 10 / tcount, id, tcount, tskip_count); \
110 for (i = 0; i < 32; i++) \
111 av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\
112 av_log(NULL, AV_LOG_ERROR, "\n"); \
113 } \
114 }
115
116 #if CONFIG_LINUX_PERF
117
118 #define START_TIMER \
119 static int linux_perf_fd = -1; \
120 uint64_t tperf; \
121 if (linux_perf_fd == -1) { \
122 struct perf_event_attr attr = { \
123 .type = PERF_TYPE_HARDWARE, \
124 .size = sizeof(struct perf_event_attr), \
125 .config = PERF_COUNT_HW_CPU_CYCLES, \
126 .disabled = 1, \
127 .exclude_kernel = 1, \
128 .exclude_hv = 1, \
129 }; \
130 linux_perf_fd = syscall(__NR_perf_event_open, &attr, \
131 0, -1, -1, 0); \
132 } \
133 if (linux_perf_fd == -1) { \
134 av_log(NULL, AV_LOG_ERROR, "perf_event_open failed: %s\n", \
135 av_err2str(AVERROR(errno))); \
136 } else { \
137 ioctl(linux_perf_fd, PERF_EVENT_IOC_RESET, 0); \
138 ioctl(linux_perf_fd, PERF_EVENT_IOC_ENABLE, 0); \
139 }
140
141 #define STOP_TIMER(id) \
142 ioctl(linux_perf_fd, PERF_EVENT_IOC_DISABLE, 0); \
143 read(linux_perf_fd, &tperf, sizeof(tperf)); \
144 TIMER_REPORT(id, tperf)
145
146 #elif CONFIG_MACOS_KPERF
147
148 #define START_TIMER \
149 uint64_t tperf; \
150 ff_kperf_init(); \
151 tperf = ff_kperf_cycles();
152
153 #define STOP_TIMER(id) \
154 TIMER_REPORT(id, ff_kperf_cycles() - tperf);
155
156 #elif defined(AV_READ_TIME)
157 #define START_TIMER \
158 uint64_t tend; \
159 uint64_t tstart = AV_READ_TIME(); \
160
161 #define STOP_TIMER(id) \
162 tend = AV_READ_TIME(); \
163 TIMER_REPORT(id, tend - tstart)
164 #else
166 #define STOP_TIMER(id) { }
167 #endif
168
169 #endif /* AVUTIL_TIMER_H */