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
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_MACH_TIME_H
46 #include <mach/mach_time.h>
47 #endif
48
50
51 #if ARCH_AARCH64
53 #elif ARCH_ARM
55 #elif ARCH_PPC
57 #elif ARCH_X86
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
138 #define STOP_TIMER(id) { }
139 #endif
140
141 #endif /* AVUTIL_TIMER_H */