1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef _LIBS_CUTILS_TRACE_H
18 #define _LIBS_CUTILS_TRACE_H
19
20 #include <inttypes.h>
21 #include <stdatomic.h>
22 #include <stdbool.h>
23 #include <stdint.h>
24 #include <stdio.h>
25 #include <sys/cdefs.h>
26 #include <sys/types.h>
27 #include <unistd.h>
28 #include <cutils/compiler.h>
29
30 __BEGIN_DECLS
31
32 /**
33 * The ATRACE_TAG macro can be defined before including this header to trace
34 * using one of the tags defined below. It must be defined to one of the
35 * following ATRACE_TAG_* macros. The trace tag is used to filter tracing in
36 * userland to avoid some of the runtime cost of tracing when it is not desired.
37 *
38 * Defining ATRACE_TAG to be ATRACE_TAG_ALWAYS will result in the tracing always
39 * being enabled - this should ONLY be done for debug code, as userland tracing
40 * has a performance cost even when the trace is not being recorded. Defining
41 * ATRACE_TAG to be ATRACE_TAG_NEVER or leaving ATRACE_TAG undefined will result
42 * in the tracing always being disabled.
43 *
44 * ATRACE_TAG_HAL should be bitwise ORed with the relevant tags for tracing
45 * within a hardware module. For example a camera hardware module would set:
46 * #define ATRACE_TAG (ATRACE_TAG_CAMERA | ATRACE_TAG_HAL)
47 *
48 * Keep these in sync with frameworks/base/core/java/android/os/Trace.java.
49 */
50 #define ATRACE_TAG_NEVER 0 // This tag is never enabled.
51 #define ATRACE_TAG_ALWAYS (1<<0) // This tag is always enabled.
52 #define ATRACE_TAG_GRAPHICS (1<<1)
53 #define ATRACE_TAG_INPUT (1<<2)
54 #define ATRACE_TAG_VIEW (1<<3)
55 #define ATRACE_TAG_WEBVIEW (1<<4)
56 #define ATRACE_TAG_WINDOW_MANAGER (1<<5)
57 #define ATRACE_TAG_ACTIVITY_MANAGER (1<<6)
58 #define ATRACE_TAG_SYNC_MANAGER (1<<7)
59 #define ATRACE_TAG_AUDIO (1<<8)
60 #define ATRACE_TAG_VIDEO (1<<9)
61 #define ATRACE_TAG_CAMERA (1<<10)
62 #define ATRACE_TAG_HAL (1<<11)
63 #define ATRACE_TAG_APP (1<<12)
64 #define ATRACE_TAG_RESOURCES (1<<13)
65 #define ATRACE_TAG_DALVIK (1<<14)
66 #define ATRACE_TAG_RS (1<<15)
67 #define ATRACE_TAG_BIONIC (1<<16)
68 #define ATRACE_TAG_POWER (1<<17)
69 #define ATRACE_TAG_PACKAGE_MANAGER (1<<18)
70 #define ATRACE_TAG_SYSTEM_SERVER (1<<19)
71 #define ATRACE_TAG_DATABASE (1<<20)
72 #define ATRACE_TAG_NETWORK (1<<21)
73 #define ATRACE_TAG_ADB (1<<22)
74 #define ATRACE_TAG_VIBRATOR (1<<23)
75 #define ATRACE_TAG_AIDL (1<<24)
76 #define ATRACE_TAG_NNAPI (1<<25)
77 #define ATRACE_TAG_RRO (1<<26)
78 #define ATRACE_TAG_LAST ATRACE_TAG_RRO
79
80 // Reserved for initialization.
81 #define ATRACE_TAG_NOT_READY (1ULL<<63)
82
83 #define ATRACE_TAG_VALID_MASK ((ATRACE_TAG_LAST - 1) | ATRACE_TAG_LAST)
84
85 #ifndef ATRACE_TAG
86 #define ATRACE_TAG ATRACE_TAG_NEVER
87 #elif ATRACE_TAG > ATRACE_TAG_VALID_MASK
88 #error ATRACE_TAG must be defined to be one of the tags defined in cutils/trace.h
89 #endif
90
91 /**
92 * Opens the trace file for writing and reads the property for initial tags.
93 * The atrace.tags.enableflags property sets the tags to trace.
94 * This function should not be explicitly called, the first call to any normal
95 * trace function will cause it to be run safely.
96 */
97 void atrace_setup();
98
99 /**
100 * If tracing is ready, set atrace_enabled_tags to the system property
101 * debug.atrace.tags.enableflags. Can be used as a sysprop change callback.
102 */
103 void atrace_update_tags();
104
105 /**
106 * Set whether tracing is enabled for the current process. This is used to
107 * prevent tracing within the Zygote process.
108 */
109 void atrace_set_tracing_enabled(bool enabled);
110
111 /**
112 * This is always set to false. This forces code that uses an old version
113 * of this header to always call into atrace_setup, in which we call
114 * atrace_init unconditionally.
115 */
116 extern atomic_bool atrace_is_ready;
117
118 /**
119 * Set of ATRACE_TAG flags to trace for, initialized to ATRACE_TAG_NOT_READY.
120 * A value of zero indicates setup has failed.
121 * Any other nonzero value indicates setup has succeeded, and tracing is on.
122 */
123 extern uint64_t atrace_enabled_tags;
124
125 /**
126 * Handle to the kernel's trace buffer, initialized to -1.
127 * Any other value indicates setup has succeeded, and is a valid fd for tracing.
128 */
129 extern int atrace_marker_fd;
130
131 /**
132 * atrace_init readies the process for tracing by opening the trace_marker file.
133 * Calling any trace function causes this to be run, so calling it is optional.
134 * This can be explicitly run to avoid setup delay on first trace function.
135 */
136 #define ATRACE_INIT() atrace_init()
137 #define ATRACE_GET_ENABLED_TAGS() atrace_get_enabled_tags()
138
139 void atrace_init();
140 uint64_t atrace_get_enabled_tags();
141
142 /**
143 * Test if a given tag is currently enabled.
144 * Returns nonzero if the tag is enabled, otherwise zero.
145 * It can be used as a guard condition around more expensive trace calculations.
146 */
147 #define ATRACE_ENABLED() atrace_is_tag_enabled(ATRACE_TAG)
atrace_is_tag_enabled(uint64_t tag)148 static inline uint64_t atrace_is_tag_enabled(uint64_t tag)
149 {
150 return atrace_get_enabled_tags() & tag;
151 }
152
153 /**
154 * Trace the beginning of a context. name is used to identify the context.
155 * This is often used to time function execution.
156 */
157 #define ATRACE_BEGIN(name) atrace_begin(ATRACE_TAG, name)
atrace_begin(uint64_t tag,const char * name)158 static inline void atrace_begin(uint64_t tag, const char* name)
159 {
160 if (CC_UNLIKELY(atrace_is_tag_enabled(tag))) {
161 void atrace_begin_body(const char*);
162 atrace_begin_body(name);
163 }
164 }
165
166 /**
167 * Trace the end of a context.
168 * This should match up (and occur after) a corresponding ATRACE_BEGIN.
169 */
170 #define ATRACE_END() atrace_end(ATRACE_TAG)
atrace_end(uint64_t tag)171 static inline void atrace_end(uint64_t tag)
172 {
173 if (CC_UNLIKELY(atrace_is_tag_enabled(tag))) {
174 void atrace_end_body();
175 atrace_end_body();
176 }
177 }
178
179 /**
180 * Trace the beginning of an asynchronous event. Unlike ATRACE_BEGIN/ATRACE_END
181 * contexts, asynchronous events do not need to be nested. The name describes
182 * the event, and the cookie provides a unique identifier for distinguishing
183 * simultaneous events. The name and cookie used to begin an event must be
184 * used to end it.
185 */
186 #define ATRACE_ASYNC_BEGIN(name, cookie) \
187 atrace_async_begin(ATRACE_TAG, name, cookie)
atrace_async_begin(uint64_t tag,const char * name,int32_t cookie)188 static inline void atrace_async_begin(uint64_t tag, const char* name,
189 int32_t cookie)
190 {
191 if (CC_UNLIKELY(atrace_is_tag_enabled(tag))) {
192 void atrace_async_begin_body(const char*, int32_t);
193 atrace_async_begin_body(name, cookie);
194 }
195 }
196
197 /**
198 * Trace the end of an asynchronous event.
199 * This should have a corresponding ATRACE_ASYNC_BEGIN.
200 */
201 #define ATRACE_ASYNC_END(name, cookie) atrace_async_end(ATRACE_TAG, name, cookie)
atrace_async_end(uint64_t tag,const char * name,int32_t cookie)202 static inline void atrace_async_end(uint64_t tag, const char* name, int32_t cookie)
203 {
204 if (CC_UNLIKELY(atrace_is_tag_enabled(tag))) {
205 void atrace_async_end_body(const char*, int32_t);
206 atrace_async_end_body(name, cookie);
207 }
208 }
209
210 /**
211 * Traces an integer counter value. name is used to identify the counter.
212 * This can be used to track how a value changes over time.
213 */
214 #define ATRACE_INT(name, value) atrace_int(ATRACE_TAG, name, value)
atrace_int(uint64_t tag,const char * name,int32_t value)215 static inline void atrace_int(uint64_t tag, const char* name, int32_t value)
216 {
217 if (CC_UNLIKELY(atrace_is_tag_enabled(tag))) {
218 void atrace_int_body(const char*, int32_t);
219 atrace_int_body(name, value);
220 }
221 }
222
223 /**
224 * Traces a 64-bit integer counter value. name is used to identify the
225 * counter. This can be used to track how a value changes over time.
226 */
227 #define ATRACE_INT64(name, value) atrace_int64(ATRACE_TAG, name, value)
atrace_int64(uint64_t tag,const char * name,int64_t value)228 static inline void atrace_int64(uint64_t tag, const char* name, int64_t value)
229 {
230 if (CC_UNLIKELY(atrace_is_tag_enabled(tag))) {
231 void atrace_int64_body(const char*, int64_t);
232 atrace_int64_body(name, value);
233 }
234 }
235
236 __END_DECLS
237
238 #endif // _LIBS_CUTILS_TRACE_H
239