0.文章学习

https://www.2cto.com/kf/201607/528696.html

1.使用场景

使用 adb bugreport 可以导出功耗分析所需文件，然后通过 https://github.com/google/battery-historian 进行更加详细的分析

adb bugreport > Bugreport.zip
adb bugreport > Bugreport.txt

adb bugreport - return all information from the device that should be included in a bug report.

    " bugreport [PATH]\n"
    "     write bugreport to given PATH [default=bugreport.zip];\n"
    "     if PATH is a directory, the bug report is saved in that directory.\n"
    "     devices that don't support zipped bug reports output to stdout.\n"

这里主要想知道 bugreport 的数据从哪里导出

2. bugreport 数据来源

2.1 adb bugreport 命令下发的接收点

system/core/adb/commandline.cpp

命令行接收事件查看

#include "bugreport.h"

int adb_commandline(int argc, const char** argv) {

    ...
    } else if (!strcmp(argv[0], "bugreport")) {
    Bugreport bugreport;
    return bugreport.DoIt(argc, argv);
    ....

2.2 bugreport.DoIt(argc, argv)

system/core/adb/bugreport.cpp

int Bugreport::DoIt(int argc, const char** argv) {
    ...
    return SendShellCommand(bugz_command, false, &bugz_callback);
}

2.3 命令下发执行文件

对应系统目录下的可执行文件

/system/bin # ls -al

-rwxr-xr-x  1 root   shell      10264 2018-05-31 15:18 bugreport
-rwxr-xr-x  1 root   shell      10264 2018-05-31 15:18 bugreportz

frameworks\native\cmds\bugreport\bugreport.cpp

2.4 读取bugreport信息

其实bugreport就是 dumpstate，具体文件在手机系统目录 system/bin/dumpstate，dumpstate是可执行文件

• cmd 窗口

Sufadi:/system/bin # ls dumpstate -all
ls dumpstate -all
-rwxr-xr-x 1 root shell 207136 2018-05-31 15:18 dumpstate

• 具体源码

// This program will trigger the dumpstate service to start a call to
// dumpstate, then connect to the dumpstate local client to read the
// output. All of the dumpstate output is written to stdout, including
// any errors encountered while reading/writing the output.
int main() {
  ...
  // Start the dumpstate service. 启动 dumpstate service
  // 其实bugreport就是 dumpstate 
  property_set("ctl.start", "dumpstate");

  ...

  while (1) {
    ...
    char buffer[65536];
    ssize_t bytes_read = TEMP_FAILURE_RETRY(read(s, buffer, sizeof(buffer)));

    do {
      bytes_written = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
                                               buffer + bytes_read - bytes_to_send,
                                               bytes_to_send));
      if (bytes_written == -1) {
        printf("Failed to write data to stdout: read %zd, trying to send %zd (%s)\n",
               bytes_read, bytes_to_send, strerror(errno));
        return 1;
      }
      bytes_to_send -= bytes_written;
    } while (bytes_written != 0 && bytes_to_send > 0);
  }

  close(s);
  return 0;
}

2.5 dumpstate 的实现及其数据来源

frameworks\native\cmds\dumpstate\dumpstate.cpp

• 1.系统属性
• 2./proc和/sys节点文件
• 3.执行shell命令获得相关输出
• 4.logcat输出
• 5.Android Framework Services信息基本使用dumpsys命令通过binder调用服务中的dump函数获得信息

static void dumpstate() {
    DurationReporter duration_reporter("DUMPSTATE");

    dump_dev_files("TRUSTY VERSION", "/sys/bus/platform/drivers/trusty", "trusty_version");
    RunCommand("UPTIME", {"uptime"});
    DumpBlockStatFiles();
    dump_emmc_ecsd("/d/mmc0/mmc0:0001/ext_csd");
    DumpFile("MEMORY INFO", "/proc/meminfo");
    RunCommand("CPU INFO", {"top", "-b", "-n", "1", "-H", "-s", "6", "-o",
                            "pid,tid,user,pr,ni,%cpu,s,virt,res,pcy,cmd,name"});
    RunCommand("PROCRANK", {"procrank"}, AS_ROOT_20);
    DumpFile("VIRTUAL MEMORY STATS", "/proc/vmstat");
    DumpFile("VMALLOC INFO", "/proc/vmallocinfo");
    DumpFile("SLAB INFO", "/proc/slabinfo");
    DumpFile("ZONEINFO", "/proc/zoneinfo");
    DumpFile("PAGETYPEINFO", "/proc/pagetypeinfo");
    DumpFile("BUDDYINFO", "/proc/buddyinfo");
    DumpFile("FRAGMENTATION INFO", "/d/extfrag/unusable_index");

    DumpFile("KERNEL WAKE SOURCES", "/d/wakeup_sources");
    DumpFile("KERNEL CPUFREQ", "/sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state");
    DumpFile("KERNEL SYNC", "/d/sync");

    RunCommand("PROCESSES AND THREADS",
               {"ps", "-A", "-T", "-Z", "-O", "pri,nice,rtprio,sched,pcy"});
    RunCommand("LIBRANK", {"librank"}, CommandOptions::AS_ROOT);

    if (ds.IsZipping()) {
        RunCommand(
                "HARDWARE HALS",
                {"lshal", std::string("--debug=") + kLsHalDebugPath},
                CommandOptions::AS_ROOT);

        ds.AddZipEntry("lshal-debug.txt", kLsHalDebugPath);

        unlink(kLsHalDebugPath.c_str());
    } else {
        RunCommand(
                "HARDWARE HALS", {"lshal", "--debug"}, CommandOptions::AS_ROOT);
    }

    RunCommand("PRINTENV", {"printenv"});
    RunCommand("NETSTAT", {"netstat", "-nW"});
    struct stat s;
    if (stat("/proc/modules", &s) != 0) {
        MYLOGD("Skipping 'lsmod' because /proc/modules does not exist\n");
    } else {
        RunCommand("LSMOD", {"lsmod"});
    }

    do_dmesg();

    RunCommand("LIST OF OPEN FILES", {"lsof"}, CommandOptions::AS_ROOT);
    for_each_pid(do_showmap, "SMAPS OF ALL PROCESSES");
    for_each_tid(show_wchan, "BLOCKED PROCESS WAIT-CHANNELS");
    for_each_pid(show_showtime, "PROCESS TIMES (pid cmd user system iowait+percentage)");

    /* Dump Bluetooth HCI logs */
    ds.AddDir("/data/misc/bluetooth/logs", true);

    if (!ds.do_early_screenshot_) {
        MYLOGI("taking late screenshot\n");
        ds.TakeScreenshot();
    }

    DoLogcat();

    AddAnrTraceFiles();

    // NOTE: tombstones are always added as separate entries in the zip archive
    // and are not interspersed with the main report.
    const bool tombstones_dumped = AddDumps(tombstone_data->begin(), tombstone_data->end(),
                                            "TOMBSTONE", true /* add_to_zip */);
    if (!tombstones_dumped) {
        printf("*** NO TOMBSTONES to dump in %s\n\n", TOMBSTONE_DIR.c_str());
    }

    DumpPacketStats();

    DoKmsg();

    DumpIpAddrAndRules();

    dump_route_tables();

    RunCommand("ARP CACHE", {"ip", "-4", "neigh", "show"});
    RunCommand("IPv6 ND CACHE", {"ip", "-6", "neigh", "show"});
    RunCommand("MULTICAST ADDRESSES", {"ip", "maddr"});

    RunDumpsys("NETWORK DIAGNOSTICS", {"connectivity", "--diag"},
               CommandOptions::WithTimeout(10).Build());

    RunCommand("SYSTEM PROPERTIES", {"getprop"});

    RunCommand("VOLD DUMP", {"vdc", "dump"});
    RunCommand("SECURE CONTAINERS", {"vdc", "asec", "list"});

    RunCommand("STORAGED TASKIOINFO", {"storaged", "-u"}, CommandOptions::WithTimeout(10).Build());

    RunCommand("FILESYSTEMS & FREE SPACE", {"df"});

    RunCommand("LAST RADIO LOG", {"parse_radio_log", "/proc/last_radio_log"});

    printf("------ BACKLIGHTS ------\n");
    printf("LCD brightness=");
    DumpFile("", "/sys/class/leds/lcd-backlight/brightness");
    printf("Button brightness=");
    DumpFile("", "/sys/class/leds/button-backlight/brightness");
    printf("Keyboard brightness=");
    DumpFile("", "/sys/class/leds/keyboard-backlight/brightness");
    printf("ALS mode=");
    DumpFile("", "/sys/class/leds/lcd-backlight/als");
    printf("LCD driver registers:\n");
    DumpFile("", "/sys/class/leds/lcd-backlight/registers");
    printf("\n");

    /* Binder state is expensive to look at as it uses a lot of memory. */
    DumpFile("BINDER FAILED TRANSACTION LOG", "/sys/kernel/debug/binder/failed_transaction_log");
    DumpFile("BINDER TRANSACTION LOG", "/sys/kernel/debug/binder/transaction_log");
    DumpFile("BINDER TRANSACTIONS", "/sys/kernel/debug/binder/transactions");
    DumpFile("BINDER STATS", "/sys/kernel/debug/binder/stats");
    DumpFile("BINDER STATE", "/sys/kernel/debug/binder/state");

    ds.DumpstateBoard();

    /* Migrate the ril_dumpstate to a device specific dumpstate? */
    int rilDumpstateTimeout = android::base::GetIntProperty("ril.dumpstate.timeout", 0);
    if (rilDumpstateTimeout > 0) {
        // su does not exist on user builds, so try running without it.
        // This way any implementations of vril-dump that do not require
        // root can run on user builds.
        CommandOptions::CommandOptionsBuilder options =
            CommandOptions::WithTimeout(rilDumpstateTimeout);
        if (!PropertiesHelper::IsUserBuild()) {
            options.AsRoot();
        }
        RunCommand("DUMP VENDOR RIL LOGS", {"vril-dump"}, options.Build());
    }

    printf("========================================================\n");
    printf("== Android Framework Services\n");
    printf("========================================================\n");

    RunDumpsys("DUMPSYS", {"--skip", "meminfo", "cpuinfo"}, CommandOptions::WithTimeout(90).Build(),
               10);

    printf("========================================================\n");
    printf("== Checkins\n");
    printf("========================================================\n");

    RunDumpsys("CHECKIN BATTERYSTATS", {"batterystats", "-c"});
    RunDumpsys("CHECKIN MEMINFO", {"meminfo", "--checkin"});
    RunDumpsys("CHECKIN NETSTATS", {"netstats", "--checkin"});
    RunDumpsys("CHECKIN PROCSTATS", {"procstats", "-c"});
    RunDumpsys("CHECKIN USAGESTATS", {"usagestats", "-c"});
    RunDumpsys("CHECKIN PACKAGE", {"package", "--checkin"});

    printf("========================================================\n");
    printf("== Running Application Activities\n");
    printf("========================================================\n");

    RunDumpsys("APP ACTIVITIES", {"activity", "-v", "all"});

    printf("========================================================\n");
    printf("== Running Application Services\n");
    printf("========================================================\n");

    RunDumpsys("APP SERVICES", {"activity", "service", "all"});

    printf("========================================================\n");
    printf("== Running Application Providers\n");
    printf("========================================================\n");

    RunDumpsys("APP PROVIDERS", {"activity", "provider", "all"});

    printf("========================================================\n");
    printf("== Dropbox crashes\n");
    printf("========================================================\n");

    RunDumpsys("DROPBOX SYSTEM SERVER CRASHES", {"dropbox", "-p", "system_server_crash"});
    RunDumpsys("DROPBOX SYSTEM APP CRASHES", {"dropbox", "-p", "system_app_crash"});

    printf("========================================================\n");
    printf("== Final progress (pid %d): %d/%d (estimated %d)\n", ds.pid_, ds.progress_->Get(),
           ds.progress_->GetMax(), ds.progress_->GetInitialMax());
    printf("========================================================\n");
    printf("== dumpstate: done (id %d)\n", ds.id_);
    printf("========================================================\n");
}

上述例如
- 查看电池信息
RunDumpsys(“CHECKIN BATTERYSTATS”, {“batterystats”, “-c”});

• 查看kernal的唤醒源
  DumpFile(“KERNEL WAKE SOURCES”, “/d/wakeup_sources”);

3. bugreport 数据展示

从bugreport导出手机数据，通过battery-historian解析原始数据进行多维度分析功耗异常

https://github.com/google/battery-historian