通知系统进行内存清理
IDLE_NOW_MSG
AMS::forceStopPackageLocked
// native kill
ActivityStackSupervisor::scheduleIdleLocked
IDLE_TIMEOUT_MSG
completeResumeLocked
scheduleIdleTimeoutLocked
activityIdle调用栈
activityIdleInternalLocked
AMS::scheduleAppGcsLocked // 1. ActivityIdle 2. 串行广播处理完成
mProcessesToGc// ProcessRecord
Message// GC_BACKGROUND_PROCESSES_MSG
performAppGcsIfAppropriateLocked
if canGcNow
performAppGcsLocked
performAppGcLocked //
AppThread::scheduleLowMemory
else
scheduleAppGcsLocked // Still not idle, wait some more.
stops // ArrayList<ActivityRecord>
if r.finishing
finishCurrentActivityLocked
else
stopActivityLocked
mFinishingActivities // ActivityRecord
destroyActivityLocked
instrumentationClass 清理调用栈
AppDeathRecipient::binderDied
appDiedLocked // 限制引用被kill后，重新启动allowRestart
handleAppDiedLocked // 如果引用在黑名单，则setPackageStoppedState
cleanUpApplicationRecordLocked
// 正在启动的provider需要重启
finishInstrumentationLocked
app.instrumentationClass = null
willStart // restart
addAppLocked
trimApplications 触发时机
activityStopped
finishReceiver
trimApplications
mRemovedProcesses// empty process
// crash 的进程
// 5秒内没有响应并被用户选在强制关闭的进程
//应用开发这调用 killBackgroundProcess 想要杀死的进程
if pid > 0
app.kill
else
AppThread::onTerminate
Looper.quit
cleanUpApplicationRecordLocked
addAppLocked // persistent
各种关闭当前Activity引起的内存回收
各种关闭当前Activity引起的内存回收
