为什么google apk 的adj为100

先说结论：使用低adj的apk使用bindService的方式启动新的apk，就可以使新apk的adj值实现100。

1 google gms的apk adj是100

console:/ # ps -A | grep gms
u0_a40 1276 382 1251444 58220 do_epoll_wait 0 S com.google.android.gms.persistent
u0_a40 1438 382 1366508 67448 do_epoll_wait 0 S com.google.android.gms
u0_a40 3309 382 1217588 36128 do_epoll_wait 0 S com.google.android.gms.unstable

console:/ # cat /proc/1276/oom_score_adj
100
console:/ # cat /proc/1438/oom_score_adj
100
console:/ # cat /proc/3309/oom_score_adj
100

2 当kill掉1276 process， ams会自动启动新persistent进程，其adj也是100

是因为一个service（PersistentBoundBrokerService）启动的这个process

D Zygote : Forked child process 4919
I ActivityManager: Start proc 4919:com.google.android.gms.persistent/u0a40 for service {com.google.android.gms/com.google.android.gms.chimera.PersistentBoundBrokerService}

130|console:/ # cat /proc/4919/oom_score_adj
100

3 通过dumpsys activity p 查找到com.google.android.gms.persistent

显示其oom adj为100

oom adj: max=1001 curRaw=100 setRaw=100 cur=100 set=100，

看到有PersistentBoundBrokerService，是一个servicerecord

*APP* UID 10040 ProcessRecord{1221e37 4919:com.google.android.gms.persistent/u0a40}
user #0 uid=10040 gids={2001, 1005, 3002, 3003, 3001, 3007, 1007, 3006, 50040, 20040, 9997}
mRequiredAbi=armeabi-v7a instructionSet=arm
class=co.g.App
manageSpaceActivityName=co.g.Space
dir=/data/app/~~OVDie3juakjbdsqvQZe_3Q==/com.google.android.gms-nQid-e3R-a4baq8BQGab8Q==/base.apk publicDir=/data/app/~~OVDie3juakjbdsqvQZe_3Q==/com.google.android.gms-nQid-e3R-a4baq8BQGab8Q==/base.apk data=/data/user/0/com.google.android.gms
packageList={com.google.android.gms}
compat={320dpi always-compat}
thread=android.app.IApplicationThread$Stub$Proxy@167737e
pid=4919
lastActivityTime=-7s450ms
startSeq=86
mountMode=DEFAULT
lastPssTime=-7s510ms pssProcState=3 pssStatType=0 nextPssTime=+33m37s435ms
lastPss=51MB lastSwapPss=570KB lastCachedPss=0.00 lastCachedSwapPss=0.00 lastRss=115MB
trimMemoryLevel=0
procStateMemTracker: best=2 (2=2 5.0625x)
lastRequestedGc=-39m30s39ms lastLowMemory=-39m30s39ms reportLowMemory=false
reportedInteraction=true time=-7s565ms
adjSeq=4212 lruSeq=1425
oom adj: max=1001 curRaw=100 setRaw=100 cur=100 set=100
mCurSchedGroup=2 setSchedGroup=2 systemNoUi=false
curProcState=3 mRepProcState=3 setProcState=3 lastStateTime=-22m48s588ms
curCapability=---N setCapability=---N
allowStartFgsState=5
cached=false empty=true
hasStartedServices=true
Services:
......
- ServiceRecord{df148bc u0 com.google.android.gms/.chimera.PersistentBoundBrokerService}
......
mConnections:
- ConnectionRecord{d763b9a u0 CR WACT CAPS com.google.android.gms/com.google.android.location.internal.GoogleLocationManagerService:@31d8845}
......
lastProviderTime=-3m11s647ms
Published Providers:
- com.google.android.gms.auth.account.be.accountstate.AccountStateContentProvider
-> ContentProviderRecord{fb0c0df u0 com.google.android.gms/.auth.account.be.accountstate.AccountStateContentProvider}
......
Connected Providers:
- 3ea4a4d/com.android.providers.settings/.SettingsProvider->4919:com.google.android.gms.persistent/u0a40 s1/1 u0/0 +39m29s753ms
mReceivers:
- ReceiverList{164aa11 4919 com.google.android.gms.persistent/10040/u0 remote:5955a38}
......
lastCompactTime=0 lastCompactAction=0
isFreezeExempt=false isPendingFreeze=false isFrozen=false
BoundClientUids:[10041, 10040, 10039, 1000]
Configuration={1.0 ?mcc?mnc [en_US] ldltr sw540dp w960dp h540dp 320dpi lrg long land television night -touch -keyb/v/h dpad/v winConfig={ mBounds=Rect(0, 0 - 1920, 1080) mAppBounds=Rect(0, 0 - 1920, 1080) mMaxBounds=Rect(0, 0 - 1920, 1080) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=undefined mAlwaysOnTop=undefined mRotation=ROTATION_0} s.6 fontWeightAdjustment=0}
OverrideConfiguration={0.0 ?mcc?mnc ?localeList ?layoutDir ?swdp ?wdp ?hdp ?density ?lsize ?long ?ldr ?wideColorGamut ?orien ?uimode ?night ?touch ?keyb/?/? ?nav/? winConfig={ mBounds=Rect(0, 0 - 0, 0) mAppBounds=null mMaxBounds=Rect(0, 0 - 0, 0) mWindowingMode=undefined mDisplayWindowingMode=undefined mActivityType=undefined mAlwaysOnTop=undefined mRotation=undefined} ?fontWeightAdjustment}
mLastReportedConfiguration={1.0 ?mcc?mnc [en_US] ldltr sw540dp w960dp h540dp 320dpi lrg long land television night -touch -keyb/v/h dpad/v winConfig={ mBounds=Rect(0, 0 - 1920, 1080) mAppBounds=Rect(0, 0 - 1920, 1080) mMaxBounds=Rect(0, 0 - 1920, 1080) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=undefined mAlwaysOnTop=undefined mRotation=ROTATION_0} s.6 fontWeightAdjustment=0}

4 然后查找这个PersistentBoundBrokerService service是谁使用或者绑定的呢

同样命令 dumpsys activity p，看到是system process 与PersistentBoundBrokerService有serviceConnection。

*PERS* UID 1000 ProcessRecord{8489dca 742:system/1000}
user #0 uid=1000 gids={}
mRequiredAbi=null instructionSet=null
dir=/system/framework/framework-res.apk publicDir=/system/framework/framework-res.apk data=/data/system
packageList={com.android.networkstack.inprocess, android, com.android.providers.settings, com.android.networkstack.tethering.inprocess, com.android.location.fused}
compat=null
thread=android.app.ActivityThread$ApplicationThread@a111319
pid=742
lastActivityTime=-3m27s765ms
persistent=true removed=false
startSeq=0
mountMode=NONE
lastPssTime=-22m41s81ms pssProcState=0 pssStatType=1 nextPssTime=+27m55s995ms
lastPss=87MB lastSwapPss=12MB lastCachedPss=0.00 lastCachedSwapPss=0.00 lastRss=123MB
trimMemoryLevel=0
procStateMemTracker: best=0 (0=0 7.59375x)
lastRequestedGc=-- lastLowMemory=-- reportLowMemory=false
reportedInteraction=true time=-6m54s951ms
adjSeq=4212 lruSeq=1
oom adj: max=-900 curRaw=-900 setRaw=-900 cur=-900 set=-900
mCurSchedGroup=2 setSchedGroup=2 systemNoUi=true
curProcState=0 mRepProcState=0 setProcState=0 lastStateTime=-1h3m44s670ms
curCapability=LCMN setCapability=LCMN
allowStartFgsState=0
cached=false empty=false
Services:
- ServiceRecord{154c252 u0 com.android.networkstack.tethering.inprocess/com.android.networkstack.tethering.TetheringService}
- ServiceRecord{c8f2fab u0 com.android.networkstack.inprocess/com.android.server.NetworkStackService}
mConnections:
......
- ConnectionRecord{249ecaf u0 CR FGS com.google.android.gms/.chimera.PersistentBoundBrokerService:@c5dac8e}
......

5 ConnectionRecord的参数 CR 和FGS

ConnectionRecord{249ecaf u0 CR FGS com.google.android.gms/.chimera.PersistentBoundBrokerService:@c5dac8e}

if ((flags&Context.BIND_AUTO_CREATE) != 0) {
sb.append("CR ");
}

if ((flags&Context.BIND_FOREGROUND_SERVICE) != 0) {
sb.append("FGS ");
}

6 所以AMS 设置一个apk的adj时会check service对应的serviceConnection, 比较serviceConnection对端的adj，给新apk设置一个合适的adj。

根据serviceConnection设置新apk的adj值的code在OomAdjuster.java，原理OomAdjuster.md中有介绍

frameworks/base/services/core/java/com/android/server/am/OomAdjuster.md

frameworks/base/services/core/java/com/android/server/am/OomAdjuster.java

    @GuardedBy({"mService", "mProcLock"})private boolean computeOomAdjLSP(ProcessRecord app, int cachedAdj,ProcessRecord topApp, boolean doingAll, long now, boolean cycleReEval,boolean computeClients) {......ArrayMap<IBinder, ArrayList<ConnectionRecord>> serviceConnections = s.getConnections();for (int conni = serviceConnections.size() - 1;conni >= 0 && (adj > ProcessList.FOREGROUND_APP_ADJ|| schedGroup == ProcessList.SCHED_GROUP_BACKGROUND|| procState > PROCESS_STATE_TOP);conni--) {......}......}

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