InputDispatcher::start
InputDispatcher::dispatchOnce
InputDispatcher::processAnrsLocked
InputDispatcher::onAnrLocked(const Connection& connection)
InputDispatcher::doNotifyAnrLockedInterruptible
NativeInputManager::notifyAnr
InputManagerService.notifyANR(InputApplicationHandle inputApplicationHandle, IBinder token, String reason)
InputManagerCallback.notifyANR
InputManagerCallback.notifyANRInner
ActivityManagerService.inputDispatchingTimedOut
AnrHelper.appNotResponding
AnrRecord.appNotResponding
ProcessErrorStateRecord.appNotResponding
ActivityManagerService.UiHandler.handleMessage(SHOW_NOT_RESPONDING_UI_MSG)
AppErrors.handleShowAnrUi
ProcessRecord.ErrorDialogController.showAnrDialogs
在 阅读源码系列：ANR 是怎么产生的 聊过不及时消费 input event 会产生 ANR：
InputReaderThread 不断地从 /dev/input 读取 input event 并放入 InputDispatcher.mInboundQueue 等待分发InputDispatcher 寻找 input event 对应的 window 并分发到它的待发送队列里（outboundQueue）waitQueue）Choreographer.doFrame 渲染一帧时首先会响应 input event 并通过 socket 告诉 InputDispatcher 从待消费队列里移除产生 ANR - 输出 ANR 日志 - 弹出 ANR 对话框 整个流程的方法栈如下：
adb logcat -v threadtime > logcat
b指定 ring buffer，默认是main,system和crash
从上面的代码可以看到 logcat system 里会输出一段 ANR 日志如下，包含以下几部分的信息（它们的次序可能会有所变化）：
ANR 关键字Load: 0.17 / 0.44 / 0.71 读取自 /proc/loadavg，表示 1, 5 和 15 分钟内的系统平均负载/proc/pressure/memory，表示任务阻塞在内存资源上的总时长# from mi 9
09-29 16:03:03.457 1763 29602 E ActivityManager: ANR in com.example.myapplication (com.example.myapplication/.MainActivity)
09-29 16:03:03.457 1763 29602 E ActivityManager: PID: 27750
09-29 16:03:03.457 1763 29602 E ActivityManager: Reason: Input dispatching timed out (com.example.myapplication/com.example.myapplication.MainActivity, 23ec514 com.example.myapplication/com.example.myapplication.MainActivity (server) is not responding. Waited 8008ms for MotionEvent(action=DOWN))
09-29 16:03:03.457 1763 29602 E ActivityManager: Parent: com.example.myapplication/.MainActivity
09-29 16:03:03.457 1763 29602 E ActivityManager: Load: 0.17 / 0.44 / 0.71
09-29 16:03:03.457 1763 29602 E ActivityManager: ----- Output from /proc/pressure/memory -----
09-29 16:03:03.457 1763 29602 E ActivityManager: some avg10=0.00 avg60=0.00 avg300=0.02 total=32995625
09-29 16:03:03.457 1763 29602 E ActivityManager: full avg10=0.00 avg60=0.00 avg300=0.00 total=11591183
09-29 16:03:03.457 1763 29602 E ActivityManager: ----- End output from /proc/pressure/memory -----
09-29 16:03:03.457 1763 29602 E ActivityManager:
09-29 16:03:03.457 1763 29602 E ActivityManager: CPU usage from 0ms to 14680ms later (2021-09-29 16:02:48.726 to 2021-09-29 16:03:03.406):
09-29 16:03:03.457 1763 29602 E ActivityManager: 32% 8356/com.taobao.taobao: 17% user + 15% kernel / faults: 9334 minor 85 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 27% 19687/com.tencent.mm: 12% user + 15% kernel / faults: 14028 minor 129 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 13% 1763/system_server: 5.8% user + 7.5% kernel / faults: 7732 minor 29 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 12% 1464/media.codec: 8.5% user + 4.2% kernel / faults: 39180 minor 6 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 5.1% 969/surfaceflinger: 1.1% user + 3.9% kernel / faults: 582 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 4% 26354/com.xiaomi.mi_connect_service: 2.8% user + 1.1% kernel / faults: 2438 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1569/media.swcodec: 0% user + 0% kernel / faults: 21304 minor 8 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 876/media.hwcodec: 0% user + 0% kernel / faults: 6726 minor 20 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.3% 23059/kworker/u16:10: 0% user + 2.3% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.3% 5410/com.sohu.inputmethod.sogou: 1.3% user + 0.9% kernel / faults: 2961 minor 53 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 2% 2847/com.android.phone: 1.2% user + 0.7% kernel / faults: 2180 minor 12 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 1.7% 1283/adbd: 0.5% user + 1.1% kernel / faults: 3 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 1.7% 1362/cnss_diag: 1.3% user + 0.3% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 1.7% 22809/kworker/u16:2: 0% user + 1.7% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 1.2% 22965/kworker/u16:7: 0% user + 1.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1410/media.extractor: 0% user + 0% kernel / faults: 4053 minor 8 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 1% 2239/cds_ol_rx_threa: 0% user + 1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 1% 21236/kworker/u16:3: 0% user + 1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.9% 22805/kworker/u16:1: 0% user + 0.9% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.8% 150/kswapd0: 0% user + 0.8% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.8% 582/logd: 0.4% user + 0.3% kernel / faults: 1 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.8% 596/[email protected]: 0% user + 0.8% kernel / faults: 15 minor 4 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.8% 795/[email protected]_64: 0% user + 0.8% kernel / faults: 74 minor 29 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.8% 835/[email protected]: 0.4% user + 0.3% kernel / faults: 298 minor 15 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.8% 4647/com.android.nfc: 0.4% user + 0.3% kernel / faults: 1060 minor 4 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.7% 26974/com.miui.player: 0.2% user + 0.5% kernel / faults: 6 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.6% 530/irq/303-fts: 0% user + 0.6% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.6% 5337/com.miui.analytics: 0.2% user + 0.4% kernel / faults: 363 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.6% 23277/com.smile.gifmaker: 0.4% user + 0.2% kernel / faults: 119 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.5% 492/crtc_commit:131: 0% user + 0.5% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.5% 693/netd: 0.1% user + 0.4% kernel / faults: 208 minor 10 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.4% 8387/com.taobao.taobao:channel: 0.3% user + 0.1% kernel / faults: 53 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.4% 27750/com.example.myapplication: 0.4% user + 0% kernel / faults: 1733 minor 17 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.4% 861/[email protected]: 0.1% user + 0.2% kernel / faults: 54 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.4% 27850/com.android.browser: 0.1% user + 0.2% kernel / faults: 117 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.3% 9/rcu_preempt: 0% user + 0.3% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.3% 21238/kworker/u16:13: 0% user + 0.3% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.3% 26155/mdnsd: 0.2% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 10/rcu_sched: 0% user + 0.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 842/[email protected]: 0.1% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 2457/com.android.systemui: 0.2% user + 0% kernel / faults: 80 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 25386/com.tencent.mm:appbrand0: 0.2% user + 0% kernel / faults: 20 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 26203/com.smile.gifmaker:messagesdk: 0.2% user + 0% kernel / faults: 11 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 26730/logcat: 0% user + 0.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 1/init: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 12/rcuop/0: 0% user + 0.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 13/rcuos/0: 0% user + 0.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 584/servicemanager: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 664/jbd2/sda31-8: 0% user + 0.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 685/tombstoned: 0% user + 0% kernel / faults: 26 minor 52 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 958/audioserver: 0% user + 0.1% kernel / faults: 89 minor 3 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 3509/irq/33-90cd000.: 0% user + 0.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.2% 18880/kworker/u16:4: 0% user + 0.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 22/rcuop/1: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 30/rcuop/2: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 46/rcuop/4: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 652/ipacm: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 653/[email protected]: 0.1% user + 0% kernel / faults: 70 minor 7 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 692/statsd: 0% user + 0.1% kernel / faults: 73 minor 2 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 794/[email protected]: 0% user + 0% kernel / faults: 15 minor 13 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 815/[email protected]: 0% user + 0% kernel / faults: 97 minor 17 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 821/[email protected]: 0% user + 0.1% kernel / faults: 33 minor 4 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 833/[email protected]: 0% user + 0% kernel / faults: 108 minor 34 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 862/qrtr_rx: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 1093/mi_thermald: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1371/cameraserver: 0% user + 0% kernel / faults: 46 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 1388/keystore: 0% user + 0.1% kernel / faults: 252 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1436/mediaserver: 0% user + 0% kernel / faults: 42 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 1651/msm_irqbalance: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 3449/com.google.android.gms.persistent: 0.1% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 3507/irq/32-90b6400.: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 4583/tcpdump: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 4834/com.xiaomi.mircs: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 5105/com.tencent.wework: 0% user + 0% kernel / faults: 5 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 25408/com.tencent.mm:appbrand1: 0.1% user + 0% kernel / faults: 15 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0.1% 29363/kworker/0:2: 0% user + 0.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 8/ksoftirqd/0: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 15/migration/0: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 31/rcuos/2: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 38/rcuop/3: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 39/rcuos/3: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 54/rcuop/5: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 70/rcuop/7: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 278/qseecom-unload-: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 370/irq/573-dma-gra: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 542/kworker/2:1H: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 556/ueventd: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 585/hwservicemanager: 0% user + 0% kernel / faults: 56 minor 8 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 626/vold: 0% user + 0% kernel / faults: 54 minor 1 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 740/kworker/3:1H: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 783/android.hardware.audio.service: 0% user + 0% kernel / faults: 65 minor 8 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 818/[email protected]: 0% user + 0% kernel / faults: 215 minor 1 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1095/batteryd: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1272/wlan_logging_th: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1433/media.metrics: 0% user + 0% kernel / faults: 35 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1457/wificond: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1480/ipacm-diag: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1574/cnss-daemon: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1617/[email protected]: 0% user + 0% kernel / faults: 24 minor 3 major
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1632/qcrild: 0% user + 0% kernel / faults: 3 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1644/hvdcp_opti: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1665/qcrild: 0% user + 0% kernel / faults: 3 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 1853/psimon: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 5514/com.miui.securitycenter.remote: 0% user + 0% kernel / faults: 21 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 8782/com.miui.powerkeeper: 0% user + 0% kernel / faults: 23 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 8829/com.taobao.taobao:sandboxed_privilege_process0: 0% user + 0% kernel / faults: 3 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 8985/com.taobao.taobao:remote: 0% user + 0% kernel / faults: 1 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 9034/cn.ticktick.task: 0% user + 0% kernel / faults: 1 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 13678/com.tencent.mm:toolsmp: 0% user + 0% kernel / faults: 17 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 13906/tv.danmaku.bili:download: 0% user + 0% kernel / faults: 2 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 14396/iptables-restore: 0% user + 0% kernel / faults: 10 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 14408/ip6tables-restore: 0% user + 0% kernel / faults: 1 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 26888/com.miui.player:remote: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 28950/kworker/1:0: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 29260/com.miui.aod:settings: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 29378/kworker/3:3: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 29558/logcat: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 0% 29564/kworker/2:0: 0% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 19% TOTAL: 8% user + 9.2% kernel + 0.6% iowait + 0.9% irq + 0.4% softirq
09-29 16:03:03.457 1763 29602 E ActivityManager: CPU usage from 57ms to 615ms later (2021-09-29 16:02:48.783 to 2021-09-29 16:02:49.341):
09-29 16:03:03.457 1763 29602 E ActivityManager: 75% 1763/system_server: 27% user + 47% kernel / faults: 1442 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 54% 29602/AnrConsumer: 15% user + 38% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 15% 1772/HeapTaskDaemon: 13% user + 2.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.2% 1781/android.ui: 0% user + 2.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.2% 3385/Binder:1763_F: 0% user + 2.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 4% 835/[email protected]: 2% user + 2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 4.2% 969/surfaceflinger: 0% user + 4.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.1% 1040/Binder:969_1: 0% user + 2.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.1% 1214/app: 0% user + 2.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 4.2% 1362/cnss_diag: 4.2% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 5.7% 8356/com.taobao.taobao: 2.8% user + 2.8% kernel / faults: 7 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.8% 8356/m.taobao.taobao: 0% user + 2.8% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 1.8% 46/rcuop/4: 0% user + 1.8% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 1.8% 70/rcuop/7: 0% user + 1.8% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 1.9% 492/crtc_commit:131: 0% user + 1.9% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 1.9% 542/kworker/2:1H: 0% user + 1.9% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 1.9% 584/servicemanager: 0% user + 1.9% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.1% 1093/mi_thermald: 0% user + 2.1% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.2% 1665/qcrild: 0% user + 2.2% kernel / faults: 1 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.3% 2239/cds_ol_rx_threa: 0% user + 2.3% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.3% 2847/com.android.phone: 2.3% user + 0% kernel / faults: 19 minor
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.3% 2847/m.android.phone: 2.3% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.3% 3437/Binder:2847_A: 2.3% user + 0% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 2.4% 3509/irq/33-90cd000.: 0% user + 2.4% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 3.2% 19687/com.tencent.mm: 0% user + 3.2% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 3.3% 22965/kworker/u16:7: 0% user + 3.3% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 3.5% 26155/mdnsd: 0% user + 3.5% kernel
09-29 16:03:03.457 1763 29602 E ActivityManager: 15% TOTAL: 6.1% user + 7.5% kernel + 0.9% irq + 0.4% softirq
class ProcessErrorStateRecord {
void appNotResponding(String activityShortComponentName, ApplicationInfo aInfo,
String parentShortComponentName, WindowProcessController parentProcess,
boolean aboveSystem, String annotation, boolean onlyDumpSelf) {
// ...
// Log the ANR to the main log.
StringBuilder info = new StringBuilder();
info.setLength(0);
info.append("ANR in ").append(mApp.processName);
if (activityShortComponentName != null) {
info.append(" (").append(activityShortComponentName).append(")");
}
info.append("\\\\n");
info.append("PID: ").append(pid).append("\\\\n");
if (annotation != null) {
info.append("Reason: ").append(annotation).append("\\\\n");
}
if (parentShortComponentName != null
&& parentShortComponentName.equals(activityShortComponentName)) {
info.append("Parent: ").append(parentShortComponentName).append("\\\\n");
}
if (errorId != null) {
info.append("ErrorId: ").append(errorId.toString()).append("\\\\n");
}
info.append("Frozen: ").append(mApp.mOptRecord.isFrozen()).append("\\\\n");
// ...
StringBuilder report = new StringBuilder();
report.append(MemoryPressureUtil.currentPsiState());
ProcessCpuTracker processCpuTracker = new ProcessCpuTracker(true);
// don't dump native PIDs for background ANRs unless it is the process of interest
// ...
// For background ANRs, don't pass the ProcessCpuTracker to
// avoid spending 1/2 second collecting stats to rank lastPids.
StringWriter tracesFileException = new StringWriter();
// To hold the start and end offset to the ANR trace file respectively.
final long[] offsets = new long[2];
File tracesFile = ActivityManagerService.dumpStackTraces(firstPids,
isSilentAnr ? null : processCpuTracker, isSilentAnr ? null : lastPids,
nativePids, tracesFileException, offsets, annotation);
if (isMonitorCpuUsage()) {
mService.updateCpuStatsNow();
mService.mAppProfiler.printCurrentCpuState(report, anrTime);
info.append(processCpuTracker.printCurrentLoad());
info.append(report);
}
report.append(tracesFileException.getBuffer());
info.append(processCpuTracker.printCurrentState(anrTime));
Slog.e(TAG, info.toString());
// ...
}
}
上面的日志是在 ProcessErrorStateRecord.appNotResponding 输出的，info 是输出至 logcat system 的日志
class ProcessErrorStateRecord {
void appNotResponding(...) {
// ...
if (isMonitorCpuUsage()) {
mService.updateCpuStatsNow();
synchronized (mService.mProcessCpuTracker) {
report.append(mService.mProcessCpuTracker.printCurrentState(anrTime));
}
info.append(processCpuTracker.printCurrentLoad()); // 这里输出系统平均负载
info.append(report);
}
// ...
}
}
class ProcessCpuTracker {
// 三个值分别对应 mLoad1, mLoad5 和 mLoad15
final public String printCurrentLoad() {
StringWriter sw = new StringWriter();
PrintWriter pw = new FastPrintWriter(sw, false, 128);
pw.print("Load: ");
pw.print(mLoad1);
pw.print(" / ");
pw.print(mLoad5);
pw.print(" / ");
pw.println(mLoad15);
pw.flush();
return sw.toString();
}
// 这三个变量来自 /proc/loadavg
public void update() {
// ...
final float[] loadAverages = mLoadAverageData;
if (Process.readProcFile("/proc/loadavg", LOAD_AVERAGE_FORMAT,
null, null, loadAverages)) {
float load1 = loadAverages[0];
float load5 = loadAverages[1];
float load15 = loadAverages[2];
if (load1 != mLoad1 || load5 != mLoad5 || load15 != mLoad15) {
mLoad1 = load1;
mLoad5 = load5;
mLoad15 = load15;
onLoadChanged(load1, load5, load15);
}
}
// ...
}
}
用进程数来描述 CPU 负载压力
man proc.5
/proc/loadavg
The first three fields in this file are load average figures giving the number of jobs in the run queue (state R) or waiting for disk I/O (state D) averaged over 1, 5, and 15 minutes. They are the same as the load average numbers given by uptime(1) and other programs.
The fourth field consists of two numbers separated by a slash (/). The first of these is the number of currently runnable kernel scheduling entities (processes, threads). The value after the slash is the number of kernel scheduling entities that currently exist on the system.
The fifth field is the PID of the process that was most recently created on the system.
在绿联 6812（4 x [email protected]）上获取的值是 13.31 13.74 13.81 2/1167 3888