android 中的dumpsys

文章出处：http://blog.csdn.net/shift_wwx

请转载的朋友标明出处~~

首先来看一下dumpsys的source code：

path：frameworks/native/cmds/dumpsys

#define LOG_TAG "dumpsys"#include <utils/Log.h>#include <binder/Parcel.h>#include <binder/ProcessState.h>#include <binder/IServiceManager.h>#include <binder/TextOutput.h>#include <utils/Vector.h>#include <getopt.h>#include <stdlib.h>#include <stdio.h>#include <string.h>#include <unistd.h>#include <sys/time.h>using namespace android;static int sort_func(const String16* lhs, const String16* rhs){    return lhs->compare(*rhs);}int main(int argc, char* const argv[]){    signal(SIGPIPE, SIG_IGN);    sp<IServiceManager> sm = defaultServiceManager();    fflush(stdout);    if (sm == NULL) {ALOGE("Unable to get default service manager!");        aerr << "dumpsys: Unable to get default service manager!" << endl;        return 20;    }    Vector<String16> services;    Vector<String16> args;    bool showListOnly = false;    if ((argc == 2) && (strcmp(argv[1], "-l") == 0)) {        showListOnly = true;    }    if ((argc == 1) || showListOnly) {        services = sm->listServices();        services.sort(sort_func);        args.add(String16("-a"));    } else {     if((argc == 2) && 0 == strcmp(argv[1], "list")){ services = sm->listServices();services.sort(sort_func);const size_t N = services.size();       aout << "Currently running services:" << endl;    for (size_t i=0; i<N; i++) {     aout << "  " << services[i] << endl;}return 0;  } else{        services.add(String16(argv[1]));        for (int i=2; i<argc; i++) {            args.add(String16(argv[i]));        } }    }    const size_t N = services.size();    if (N > 1) {        // first print a list of the current services        aout << "Currently running services:" << endl;            for (size_t i=0; i<N; i++) {            sp<IBinder> service = sm->checkService(services[i]);            if (service != NULL) {                aout << "  " << services[i] << endl;            }        }    }    if (showListOnly) {        return 0;    }    for (size_t i=0; i<N; i++) {        sp<IBinder> service = sm->checkService(services[i]);        if (service != NULL) {            if (N > 1) {                aout << "------------------------------------------------------------"                        "-------------------" << endl;                aout << "DUMP OF SERVICE " << services[i] << ":" << endl;            }            int err = service->dump(STDOUT_FILENO, args);            if (err != 0) {                aerr << "Error dumping service info: (" << strerror(err)                        << ") " << services[i] << endl;            }        } else {            aerr << "Can't find service: " << services[i] << endl;        }    }    return 0;}

从code中可以看到对参数的要求：

1. 当没有参数的时候会，list出所有的services，然后dump出来信息

2. 当参数是-l 或者是list的时候，只会list出所有的services

3. 当参数后面是service name的时候，会dump出service的信息

dumpsys -l：

  SurfaceFlinger  accessibility  account  activity  alarm  android.security.keystore  appops  appwidget  audio  backup  battery  batterypropreg  batterystats  clipboard  commontime_management  connectivity  consumer_ir  content  country_detector  cpuinfo  dbinfo  device_policy  devicestoragemonitor  diskstats  display  dreams  drm.drmManager  dropbox  entropy  ethernet  gfxinfo  hardware  image.player  input  input_method  iphonesubinfo  isms  location  lock_settings  mbox_outputmode_service  media.audio_flinger  media.audio_policy  media.camera  media.player  media_router  meminfo  mount  netpolicy  netstats  network_management  notification  package  permission  phone  power  pppoe  print  procstats  samplingprofiler  scheduling_policy  search  sensorservice  serial  servicediscovery  simphonebook  sip  statusbar  subtitle_service  system_write  telephony.registry  textservices  uimode  updatelock  usagestats  usb  user  vibrator  wallpaper  wifi  wifip2p  window

从code中，可以看出，

         else{        services.add(String16(argv[1]));        for (int i=2; i<argc; i++) {            args.add(String16(argv[i]));        } }

将命令的第二个参数add到services，然后后面的都作为services的参数。

所以后面有点没看懂，为什么N会大于1？

最终所有的dump信息都是通过函数：

int err = service->dump(STDOUT_FILENO, args);

而这个service对象，是Ibinder类，所以其实可以看出来最终调用的是Ibinder类里面的dump函数，那么接下来就好办了。详细的binder机制，这里不再多说明。

下面来详细说明一下这个service。

1. meminfo

这个是比较常用的service，可以看一下：android 查看内存使用情况

2. cpuinfo

可以看一下：dumpsys cpuinfo

3. window

4. surfaceflinger