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 #include "log.h"
19 #include "property_service.h"
20
21 #include <dirent.h>
22 #include <errno.h>
23 #include <fcntl.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <sys/stat.h>
28 #include <sys/utsname.h>
29 #include <time.h>
30 #include <unistd.h>
31
32 #include <memory>
33 #include <string>
34 #include <vector>
35
36 #include <android-base/file.h>
37
38 #define LOG_ROOT "/data/bootchart"
39 #define LOG_STAT LOG_ROOT"/proc_stat.log"
40 #define LOG_PROCS LOG_ROOT"/proc_ps.log"
41 #define LOG_DISK LOG_ROOT"/proc_diskstats.log"
42 #define LOG_HEADER LOG_ROOT"/header"
43 #define LOG_ACCT LOG_ROOT"/kernel_pacct"
44
45 #define LOG_STARTFILE LOG_ROOT"/start"
46 #define LOG_STOPFILE LOG_ROOT"/stop"
47
48 // Polling period in ms.
49 static const int BOOTCHART_POLLING_MS = 200;
50
51 // Max polling time in seconds.
52 static const int BOOTCHART_MAX_TIME_SEC = 10*60;
53
54 static long long g_last_bootchart_time;
55 static int g_remaining_samples;
56
57 static FILE* log_stat;
58 static FILE* log_procs;
59 static FILE* log_disks;
60
get_uptime_jiffies()61 static long long get_uptime_jiffies() {
62 std::string uptime;
63 if (!android::base::ReadFileToString("/proc/uptime", &uptime)) {
64 return 0;
65 }
66 return 100LL * strtod(uptime.c_str(), NULL);
67 }
68
log_header()69 static void log_header() {
70 char date[32];
71 time_t now_t = time(NULL);
72 struct tm now = *localtime(&now_t);
73 strftime(date, sizeof(date), "%F %T", &now);
74
75 utsname uts;
76 if (uname(&uts) == -1) {
77 return;
78 }
79
80 std::string fingerprint = property_get("ro.build.fingerprint");
81 if (fingerprint.empty()) {
82 return;
83 }
84
85 std::string kernel_cmdline;
86 android::base::ReadFileToString("/proc/cmdline", &kernel_cmdline);
87
88 FILE* out = fopen(LOG_HEADER, "we");
89 if (out == NULL) {
90 return;
91 }
92 fprintf(out, "version = Android init 0.8\n");
93 fprintf(out, "title = Boot chart for Android (%s)\n", date);
94 fprintf(out, "system.uname = %s %s %s %s\n", uts.sysname, uts.release, uts.version, uts.machine);
95 fprintf(out, "system.release = %s\n", fingerprint.c_str());
96 // TODO: use /proc/cpuinfo "model name" line for x86, "Processor" line for arm.
97 fprintf(out, "system.cpu = %s\n", uts.machine);
98 fprintf(out, "system.kernel.options = %s\n", kernel_cmdline.c_str());
99 fclose(out);
100 }
101
do_log_uptime(FILE * log)102 static void do_log_uptime(FILE* log) {
103 fprintf(log, "%lld\n", get_uptime_jiffies());
104 }
105
do_log_file(FILE * log,const char * procfile)106 static void do_log_file(FILE* log, const char* procfile) {
107 do_log_uptime(log);
108
109 std::string content;
110 if (android::base::ReadFileToString(procfile, &content)) {
111 fprintf(log, "%s\n", content.c_str());
112 }
113 }
114
do_log_procs(FILE * log)115 static void do_log_procs(FILE* log) {
116 do_log_uptime(log);
117
118 std::unique_ptr<DIR, int(*)(DIR*)> dir(opendir("/proc"), closedir);
119 struct dirent* entry;
120 while ((entry = readdir(dir.get())) != NULL) {
121 // Only match numeric values.
122 char* end;
123 int pid = strtol(entry->d_name, &end, 10);
124 if (end != NULL && end > entry->d_name && *end == 0) {
125 char filename[32];
126
127 // /proc/<pid>/stat only has truncated task names, so get the full
128 // name from /proc/<pid>/cmdline.
129 snprintf(filename, sizeof(filename), "/proc/%d/cmdline", pid);
130 std::string cmdline;
131 android::base::ReadFileToString(filename, &cmdline);
132 const char* full_name = cmdline.c_str(); // So we stop at the first NUL.
133
134 // Read process stat line.
135 snprintf(filename, sizeof(filename), "/proc/%d/stat", pid);
136 std::string stat;
137 if (android::base::ReadFileToString(filename, &stat)) {
138 if (!cmdline.empty()) {
139 // Substitute the process name with its real name.
140 size_t open = stat.find('(');
141 size_t close = stat.find_last_of(')');
142 if (open != std::string::npos && close != std::string::npos) {
143 stat.replace(open + 1, close - open - 1, full_name);
144 }
145 }
146 fputs(stat.c_str(), log);
147 }
148 }
149 }
150
151 fputc('\n', log);
152 }
153
bootchart_init()154 static int bootchart_init() {
155 int timeout = 0;
156
157 std::string start;
158 android::base::ReadFileToString(LOG_STARTFILE, &start);
159 if (!start.empty()) {
160 timeout = atoi(start.c_str());
161 } else {
162 // When running with emulator, androidboot.bootchart=<timeout>
163 // might be passed by as kernel parameters to specify the bootchart
164 // timeout. this is useful when using -wipe-data since the /data
165 // partition is fresh.
166 std::string cmdline;
167 const char* s;
168 android::base::ReadFileToString("/proc/cmdline", &cmdline);
169 #define KERNEL_OPTION "androidboot.bootchart="
170 if ((s = strstr(cmdline.c_str(), KERNEL_OPTION)) != NULL) {
171 timeout = atoi(s + sizeof(KERNEL_OPTION) - 1);
172 }
173 }
174 if (timeout == 0)
175 return 0;
176
177 if (timeout > BOOTCHART_MAX_TIME_SEC)
178 timeout = BOOTCHART_MAX_TIME_SEC;
179
180 int count = (timeout*1000 + BOOTCHART_POLLING_MS-1)/BOOTCHART_POLLING_MS;
181
182 log_stat = fopen(LOG_STAT, "we");
183 if (log_stat == NULL) {
184 return -1;
185 }
186 log_procs = fopen(LOG_PROCS, "we");
187 if (log_procs == NULL) {
188 fclose(log_stat);
189 return -1;
190 }
191 log_disks = fopen(LOG_DISK, "we");
192 if (log_disks == NULL) {
193 fclose(log_stat);
194 fclose(log_procs);
195 return -1;
196 }
197
198 // Create kernel process accounting file.
199 close(open(LOG_ACCT, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0644));
200 acct(LOG_ACCT);
201
202 log_header();
203 return count;
204 }
205
do_bootchart_init(const std::vector<std::string> & args)206 int do_bootchart_init(const std::vector<std::string>& args) {
207 g_remaining_samples = bootchart_init();
208 if (g_remaining_samples < 0) {
209 ERROR("Bootcharting init failure: %s\n", strerror(errno));
210 } else if (g_remaining_samples > 0) {
211 NOTICE("Bootcharting started (will run for %d s).\n",
212 (g_remaining_samples * BOOTCHART_POLLING_MS) / 1000);
213 } else {
214 NOTICE("Not bootcharting.\n");
215 }
216 return 0;
217 }
218
bootchart_step()219 static int bootchart_step() {
220 do_log_file(log_stat, "/proc/stat");
221 do_log_file(log_disks, "/proc/diskstats");
222 do_log_procs(log_procs);
223
224 // Stop if /data/bootchart/stop contains 1.
225 std::string stop;
226 if (android::base::ReadFileToString(LOG_STOPFILE, &stop) && stop == "1") {
227 return -1;
228 }
229
230 return 0;
231 }
232
233 /* called to get time (in ms) used by bootchart */
bootchart_gettime()234 static long long bootchart_gettime() {
235 return 10LL*get_uptime_jiffies();
236 }
237
bootchart_finish()238 static void bootchart_finish() {
239 unlink(LOG_STOPFILE);
240 fclose(log_stat);
241 fclose(log_disks);
242 fclose(log_procs);
243 acct(NULL);
244 }
245
bootchart_sample(int * timeout)246 void bootchart_sample(int* timeout) {
247 // Do we have any more bootcharting to do?
248 if (g_remaining_samples <= 0) {
249 return;
250 }
251
252 long long current_time = bootchart_gettime();
253 int elapsed_time = current_time - g_last_bootchart_time;
254
255 if (elapsed_time >= BOOTCHART_POLLING_MS) {
256 /* count missed samples */
257 while (elapsed_time >= BOOTCHART_POLLING_MS) {
258 elapsed_time -= BOOTCHART_POLLING_MS;
259 g_remaining_samples--;
260 }
261 /* count may be negative, take a sample anyway */
262 g_last_bootchart_time = current_time;
263 if (bootchart_step() < 0 || g_remaining_samples <= 0) {
264 bootchart_finish();
265 g_remaining_samples = 0;
266 }
267 }
268 if (g_remaining_samples > 0) {
269 int remaining_time = BOOTCHART_POLLING_MS - elapsed_time;
270 if (*timeout < 0 || *timeout > remaining_time) {
271 *timeout = remaining_time;
272 }
273 }
274 }
275