Low Memory Issue debug

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1、InternalUseLowMemoryIssueDebugJinqiangQiuCopyright©MediaTekInc.Allrightsreserved.InternalUseAgenda▪LinuxMemoryLayoutOverview▪LinuxKernelLowmemoryhandling▪JavaHeapOOM2InternalUseLinuxmemorylayoutVirtualaddress(0-4G)4GKernelspace3GStackStackSharelibrarySharelibraryHeapHeapProgramAProgramB03Int

2、ernalUse如何查看memorylayout▪Userspaceprocess–adbshellcat/proc/[pid]/maps▪Kernelspace–adbshellcat/proc/mtk_memconfig/memory_layout(engload)–物理地址layout•FAQ07759如何查看当前项目的physicalmemorylayout–虚拟地址layout•FAQ07760如何查看当前项目的virtualmemorylayout4InternalUseMemorylayoutexample▪不同项目会有所差异，请以实际为准5InternalUse

3、发生了lowmemory？？菜单Setting->apps->runningapp计算方法请参考:RunningProcessesView.java(/packages/apps/settings/src/com/android/settings/applications)中的voidrefreshUi(booleandataChanged)可用内存已经很低》》》InternalUse发生了lowmemory？？LMKKernellog里面有进程被lowmemorykiller杀掉搜索：candidate或者sigkillVSS/RSS/PSS/USS意义？请问baidu

4、g

5、oogleadj的定义:processlist.java,HIDDEN_APP_MIN_ADJ=9InternalUse发生了lowmemory？？Keyword：JavaOutofmemoryorJavaHeapOutofmemoryOutOfMemoryErrorOOinmain_log.M[dalvik.vm.heapgrowthlimit]:[64m][dalvik.vm.heapsize]:[128m]8InternalUse查看内存使用的常用command▪参考FAQ04354内存不足时查看内存使用情况的一些adbcommand▪adbshellcat/proc/m

6、eminfo▪adbshellps▪adbshellcat/proc/pid/smaps▪adbshelldumpsysmeminfo▪adbshellprocrank-s(eng/userdebug)▪adbshellshowmappid(eng)9InternalUse/proc/meminfoFree=MemFree+cachedMemTotal:466564kBSwapTotal:524284kBMemFree:8860kBSwapFree:514432kBBuffers:10780kBDirty:0kBCached:98924kBWriteback:0kBSwapCa

7、ched:268kBAnonPages:190064kB此栏位若是比较大:请获取adbshellActive:150832kBMapped:86620kBcat/proc/slabinfoInactive:147600kBShmem:296kBActive(anon):94988kBSlab:57160kBInactive(anon):95400kBSReclaimable:17752kBActive(file):55844kBSUnreclaim:39408kBInactive(file):52200kBKernelStack:6504kB此栏位若是比较大:请获取adbshe

8、llcatUnevictable:1364kBPageTables:9388kB/proc/vmallocinfoMlocked:0kBNFS_Unstable:0kBHighTotal:0kBVmallocTotal:516096kBHighFree:0kBVmallocUsed:159740kBLowTotal:466564kBVmallocChunk:100356kBLowFree:8860kBInternalUsepsUSERPIDPPIDVSIZERSSWCHANPCNAMEroo