1.分析解析
android系统有earlysuspend和suspend两种休眠,earlysuspend是浅度睡眠,suspend是深度休眠。这个是由linux电源管理控制的,电源管理的接口是“/sys/power/state”和"/sys/power/wake_lock","/sys/power/wake_unlock",这个是linux是否休眠和是否进入深度休眠的关键点。只有wake_lock上锁了,linux系统就不会进入深度休眠。
2..问题解决
从上分析可知,只要linux保持有一个唤醒锁,系统就不会进入深度休眠。那么解决问题的思路是在linux启动的时候添加一个唤醒锁就行了。在init.rc文件里面添加一个初始化项:
echo "noSuspend" > /sys/power/wake_lock
————————————————————————————二、增加后台运行白名单
1.路径frameworks/base/core/res/res/values/config.xml 添加以下内容:
说明:将你要增加白名单的app包名添加为item
--------------------------------------------------------------------------------------2.路径frameworks/base/core/res/res/values/symbols.xml 添加以下内容:
3.路径/frameworks/base/services/core/java/com/android/server/am/OomAdjuster.java
修改如下:
+ private List
+ private String[] lmKillerTrackerWhitelist = Resources.getSystem().getStringArray(
com.android.internal.R.array.low_memory_killer_tracker_whitelist);
+ private mLmKillerBypassPackages = Arrays.asList(lmKillerTrackerWhitelist);
+ private boolean isInWhitelist(ProcessRecord pr) {
+ String pkgName = pr.info.packageName;
+
+ for (String token : mLmKillerBypassPackages) {
+ if (pkgName.startsWith(token)) {
+ return true;
+ }
+ }
+ return false;
+ }
+ boolean isAppWhiteProcess = false;
+ if( isInWhitelist(app) && (app.curAdj > ProcessList.PERSISTENT_SERVICE_ADJ))
+ isAppWhiteProcess = true;
+ if(isAppWhiteProcess){
+ Slog.d(TAG,"isAppWhiteProcess so not kill!");
+ ProcessList.setOomAdj(app.pid, app.uid, ProcessList.PERSISTENT_SERVICE_ADJ);
+ if (DEBUG_SWITCH || DEBUG_OOM_ADJ || mService.mCurOomAdjUid == app.info.uid) {
+ String msg = "Set " + app.pid + " " + app.processName + " adj "
+ + app.curAdj + ": " + app.adjType;
+ reportOomAdjMessageLocked(TAG_OOM_ADJ, msg);
+ }
+ app.setAdj = ProcessList.PERSISTENT_SERVICE_ADJ;
+ app.verifiedAdj = ProcessList.INVALID_ADJ;
+ }else{
+ ProcessList.setOomAdj(app.pid, app.uid, app.curAdj);
+ if (DEBUG_SWITCH || DEBUG_OOM_ADJ || mService.mCurOomAdjUid == app.info.uid) {
+ String msg = "Set " + app.pid + " " + app.processName + " adj "
+ + app.curAdj + ": " + app.adjType;
+ reportOomAdjMessageLocked(TAG_OOM_ADJ, msg);
+ }
+ app.setAdj = app.curAdj;
+ app.verifiedAdj = ProcessList.INVALID_ADJ;
+ }
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