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 #include "thread.h"
19
20 #include <fcntl.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23
24 #include "cutils/log.h"
25
26 #define EVENT_LOG_TAG_dvm_lock_sample 20003
27
28 namespace art {
29
Set4LE(uint8_t * buf,uint32_t val)30 static void Set4LE(uint8_t* buf, uint32_t val) {
31 *buf++ = (uint8_t)(val);
32 *buf++ = (uint8_t)(val >> 8);
33 *buf++ = (uint8_t)(val >> 16);
34 *buf = (uint8_t)(val >> 24);
35 }
36
EventLogWriteInt(char * dst,int value)37 static char* EventLogWriteInt(char* dst, int value) {
38 *dst++ = EVENT_TYPE_INT;
39 Set4LE(reinterpret_cast<uint8_t*>(dst), value);
40 return dst + 4;
41 }
42
EventLogWriteString(char * dst,const char * value,size_t len)43 static char* EventLogWriteString(char* dst, const char* value, size_t len) {
44 *dst++ = EVENT_TYPE_STRING;
45 len = len < 32 ? len : 32;
46 Set4LE(reinterpret_cast<uint8_t*>(dst), len);
47 dst += 4;
48 memcpy(dst, value, len);
49 return dst + len;
50 }
51
LogContentionEvent(Thread * self,uint32_t wait_ms,uint32_t sample_percent,const char * owner_filename,int32_t owner_line_number)52 void Monitor::LogContentionEvent(Thread* self, uint32_t wait_ms, uint32_t sample_percent,
53 const char* owner_filename, int32_t owner_line_number) {
54 // Emit the event list length, 1 byte.
55 char eventBuffer[174];
56 char* cp = eventBuffer;
57 *cp++ = 9;
58
59 // Emit the process name, <= 37 bytes.
60 int fd = open("/proc/self/cmdline", O_RDONLY);
61 char procName[33];
62 memset(procName, 0, sizeof(procName));
63 read(fd, procName, sizeof(procName) - 1);
64 close(fd);
65 size_t len = strlen(procName);
66 cp = EventLogWriteString(cp, procName, len);
67
68 // Emit the sensitive thread ("main thread") status, 5 bytes.
69 cp = EventLogWriteInt(cp, Thread::IsSensitiveThread());
70
71 // Emit self thread name string, <= 37 bytes.
72 std::string thread_name;
73 self->GetThreadName(thread_name);
74 cp = EventLogWriteString(cp, thread_name.c_str(), thread_name.size());
75
76 // Emit the wait time, 5 bytes.
77 cp = EventLogWriteInt(cp, wait_ms);
78
79 // Emit the source code file name, <= 37 bytes.
80 uint32_t pc;
81 ArtMethod* m = self->GetCurrentMethod(&pc);
82 const char* filename;
83 int32_t line_number;
84 TranslateLocation(m, pc, &filename, &line_number);
85 cp = EventLogWriteString(cp, filename, strlen(filename));
86
87 // Emit the source code line number, 5 bytes.
88 cp = EventLogWriteInt(cp, line_number);
89
90 // Emit the lock owner source code file name, <= 37 bytes.
91 if (owner_filename == nullptr) {
92 owner_filename = "";
93 } else if (strcmp(filename, owner_filename) == 0) {
94 // Common case, so save on log space.
95 owner_filename = "-";
96 }
97 cp = EventLogWriteString(cp, owner_filename, strlen(owner_filename));
98
99 // Emit the source code line number, 5 bytes.
100 cp = EventLogWriteInt(cp, owner_line_number);
101
102 // Emit the sample percentage, 5 bytes.
103 cp = EventLogWriteInt(cp, sample_percent);
104
105 CHECK_LE((size_t)(cp - eventBuffer), sizeof(eventBuffer));
106 android_btWriteLog(EVENT_LOG_TAG_dvm_lock_sample, EVENT_TYPE_LIST, eventBuffer,
107 (size_t)(cp - eventBuffer));
108 }
109
110 } // namespace art
111