1 /*
2 * Copyright (C) 2008 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 #include "monitor.h"
18
19 #include <fcntl.h>
20 #include <sys/stat.h>
21 #include <sys/types.h>
22
23 #include <log/log.h>
24 #include <log/log_event_list.h>
25
26 #include "art_method.h"
27 #include "jni/jni_env_ext.h"
28 #include "palette/palette.h"
29 #include "thread.h"
30
31 #define EVENT_LOG_TAG_dvm_lock_sample 20003
32
33 namespace art {
34
LogContentionEvent(Thread * self,uint32_t wait_ms,uint32_t sample_percent,ArtMethod * owner_method,uint32_t owner_dex_pc)35 void Monitor::LogContentionEvent(Thread* self,
36 uint32_t wait_ms,
37 uint32_t sample_percent,
38 ArtMethod* owner_method,
39 uint32_t owner_dex_pc) {
40 android_log_event_list ctx(EVENT_LOG_TAG_dvm_lock_sample);
41
42 const char* owner_filename;
43 int32_t owner_line_number;
44 TranslateLocation(owner_method, owner_dex_pc, &owner_filename, &owner_line_number);
45
46 // Emit the process name, <= 33 bytes.
47 char proc_name[33] = {};
48 {
49 int fd = open("/proc/self/cmdline", O_RDONLY | O_CLOEXEC);
50 read(fd, proc_name, sizeof(proc_name) - 1);
51 close(fd);
52 ctx << proc_name;
53 }
54
55 // Emit the sensitive thread ("main thread") status. We follow tradition that this corresponds
56 // to a C++ bool's value, but be explicit.
57 constexpr uint32_t kIsSensitive = 1u;
58 constexpr uint32_t kIsNotSensitive = 0u;
59 ctx << (Thread::IsSensitiveThread() ? kIsSensitive : kIsNotSensitive);
60
61 // Emit self thread name string.
62 std::string thread_name;
63 self->GetThreadName(thread_name);
64 ctx << thread_name;
65
66 // Emit the wait time.
67 ctx << wait_ms;
68
69 const char* filename = nullptr;
70 int32_t line_number;
71 std::string method_name;
72 {
73 uint32_t pc;
74 ArtMethod* m = self->GetCurrentMethod(&pc);
75 TranslateLocation(m, pc, &filename, &line_number);
76
77 // Emit the source code file name.
78 ctx << filename;
79
80 // Emit the source code line number.
81 ctx << line_number;
82
83 // Emit the method name.
84 method_name = ArtMethod::PrettyMethod(m);
85 ctx << method_name;
86 }
87
88 // Emit the lock owner source code file name.
89 if (owner_filename == nullptr) {
90 owner_filename = "";
91 } else if (strcmp(filename, owner_filename) == 0) {
92 // Common case, so save on log space.
93 owner_filename = "-";
94 }
95 ctx << owner_filename;
96
97 // Emit the source code line number.
98 ctx << owner_line_number;
99
100 // Emit the owner method name.
101 std::string owner_method_name = ArtMethod::PrettyMethod(owner_method);
102 ctx << owner_method_name;
103
104 // Emit the sample percentage.
105 ctx << sample_percent;
106
107 ctx << LOG_ID_EVENTS;
108
109 // Now report to other interested parties.
110 PaletteReportLockContention(self->GetJniEnv(),
111 wait_ms,
112 filename,
113 line_number,
114 method_name.c_str(),
115 owner_filename,
116 owner_line_number,
117 owner_method_name.c_str(),
118 proc_name,
119 thread_name.c_str());
120 }
121
122 } // namespace art
123