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 "bootchart.h"
18
19 #include <dirent.h>
20 #include <fcntl.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/stat.h>
25 #include <sys/utsname.h>
26 #include <time.h>
27 #include <unistd.h>
28
29 #include <chrono>
30 #include <condition_variable>
31 #include <memory>
32 #include <mutex>
33 #include <thread>
34
35 #include <android-base/file.h>
36 #include <android-base/logging.h>
37 #include <android-base/properties.h>
38 #include <android-base/stringprintf.h>
39
40 using android::base::StringPrintf;
41 using namespace std::chrono_literals;
42
43 namespace android {
44 namespace init {
45
46 static std::thread* g_bootcharting_thread;
47
48 static std::mutex g_bootcharting_finished_mutex;
49 static std::condition_variable g_bootcharting_finished_cv;
50 static bool g_bootcharting_finished;
51
get_uptime_jiffies()52 static long long get_uptime_jiffies() {
53 std::string uptime;
54 if (!android::base::ReadFileToString("/proc/uptime", &uptime)) return 0;
55 return 100LL * strtod(uptime.c_str(), NULL);
56 }
57
fopen_unique(const char * filename,const char * mode)58 static std::unique_ptr<FILE, decltype(&fclose)> fopen_unique(const char* filename,
59 const char* mode) {
60 std::unique_ptr<FILE, decltype(&fclose)> result(fopen(filename, mode), fclose);
61 if (!result) PLOG(ERROR) << "bootchart: failed to open " << filename;
62 return result;
63 }
64
log_header()65 static void log_header() {
66 char date[32];
67 time_t now_t = time(NULL);
68 struct tm now = *localtime(&now_t);
69 strftime(date, sizeof(date), "%F %T", &now);
70
71 utsname uts;
72 if (uname(&uts) == -1) return;
73
74 std::string fingerprint = android::base::GetProperty("ro.build.fingerprint", "");
75 if (fingerprint.empty()) return;
76
77 std::string kernel_cmdline;
78 android::base::ReadFileToString("/proc/cmdline", &kernel_cmdline);
79
80 auto fp = fopen_unique("/data/bootchart/header", "we");
81 if (!fp) return;
82 fprintf(&*fp, "version = Android init 0.8\n");
83 fprintf(&*fp, "title = Boot chart for Android (%s)\n", date);
84 fprintf(&*fp, "system.uname = %s %s %s %s\n", uts.sysname, uts.release, uts.version, uts.machine);
85 fprintf(&*fp, "system.release = %s\n", fingerprint.c_str());
86 // TODO: use /proc/cpuinfo "model name" line for x86, "Processor" line for arm.
87 fprintf(&*fp, "system.cpu = %s\n", uts.machine);
88 fprintf(&*fp, "system.kernel.options = %s\n", kernel_cmdline.c_str());
89 }
90
log_uptime(FILE * log)91 static void log_uptime(FILE* log) {
92 fprintf(log, "%lld\n", get_uptime_jiffies());
93 }
94
log_file(FILE * log,const char * procfile)95 static void log_file(FILE* log, const char* procfile) {
96 log_uptime(log);
97
98 std::string content;
99 if (android::base::ReadFileToString(procfile, &content)) {
100 fprintf(log, "%s\n", content.c_str());
101 }
102 }
103
log_processes(FILE * log)104 static void log_processes(FILE* log) {
105 log_uptime(log);
106
107 std::unique_ptr<DIR, int(*)(DIR*)> dir(opendir("/proc"), closedir);
108 struct dirent* entry;
109 while ((entry = readdir(dir.get())) != NULL) {
110 // Only match numeric values.
111 int pid = atoi(entry->d_name);
112 if (pid == 0) continue;
113
114 // /proc/<pid>/stat only has truncated task names, so get the full
115 // name from /proc/<pid>/cmdline.
116 std::string cmdline;
117 android::base::ReadFileToString(StringPrintf("/proc/%d/cmdline", pid), &cmdline);
118 const char* full_name = cmdline.c_str(); // So we stop at the first NUL.
119
120 // Read process stat line.
121 std::string stat;
122 if (android::base::ReadFileToString(StringPrintf("/proc/%d/stat", pid), &stat)) {
123 if (!cmdline.empty()) {
124 // Substitute the process name with its real name.
125 size_t open = stat.find('(');
126 size_t close = stat.find_last_of(')');
127 if (open != std::string::npos && close != std::string::npos) {
128 stat.replace(open + 1, close - open - 1, full_name);
129 }
130 }
131 fputs(stat.c_str(), log);
132 }
133 }
134
135 fputc('\n', log);
136 }
137
bootchart_thread_main()138 static void bootchart_thread_main() {
139 LOG(INFO) << "Bootcharting started";
140
141 // Open log files.
142 auto stat_log = fopen_unique("/data/bootchart/proc_stat.log", "we");
143 if (!stat_log) return;
144 auto proc_log = fopen_unique("/data/bootchart/proc_ps.log", "we");
145 if (!proc_log) return;
146 auto disk_log = fopen_unique("/data/bootchart/proc_diskstats.log", "we");
147 if (!disk_log) return;
148
149 log_header();
150
151 while (true) {
152 {
153 std::unique_lock<std::mutex> lock(g_bootcharting_finished_mutex);
154 g_bootcharting_finished_cv.wait_for(lock, 200ms);
155 if (g_bootcharting_finished) break;
156 }
157
158 log_file(&*stat_log, "/proc/stat");
159 log_file(&*disk_log, "/proc/diskstats");
160 log_processes(&*proc_log);
161 }
162
163 LOG(INFO) << "Bootcharting finished";
164 }
165
do_bootchart_start()166 static int do_bootchart_start() {
167 // We don't care about the content, but we do care that /data/bootchart/enabled actually exists.
168 std::string start;
169 if (!android::base::ReadFileToString("/data/bootchart/enabled", &start)) {
170 LOG(VERBOSE) << "Not bootcharting";
171 return 0;
172 }
173
174 g_bootcharting_thread = new std::thread(bootchart_thread_main);
175 return 0;
176 }
177
do_bootchart_stop()178 static int do_bootchart_stop() {
179 if (!g_bootcharting_thread) return 0;
180
181 // Tell the worker thread it's time to quit.
182 {
183 std::lock_guard<std::mutex> lock(g_bootcharting_finished_mutex);
184 g_bootcharting_finished = true;
185 g_bootcharting_finished_cv.notify_one();
186 }
187
188 g_bootcharting_thread->join();
189 delete g_bootcharting_thread;
190 g_bootcharting_thread = nullptr;
191 return 0;
192 }
193
do_bootchart(const std::vector<std::string> & args)194 int do_bootchart(const std::vector<std::string>& args) {
195 if (args[1] == "start") return do_bootchart_start();
196 return do_bootchart_stop();
197 }
198
199 } // namespace init
200 } // namespace android
201