[移动开发]excessive cpu 优化杀进程解决方案 android P

背景：

? ? ? ?android系统优化电池使用，在应用退到后台后会判断应用是否还在使用cpu，如果在指定时间内使用cpu到一定程度就会杀进程，报ActivityManager: Killing 9553:com.oushang.screen/1000 (adj 700): excessive cpu 56840 during 300080 dur=623325 limit=10这个错。车机需要排除排除这种情况下杀carlink进程，在checkExcessivePowerUsageLocked种修改如下：

第一次修改：

diff --git a/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java b/frameworks/base/services/core/jav
index f3531c4..b7a7927 100755
--- a/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -24657,7 +24657,11 @@ public class ActivityManagerService extends IActivityManager.Stub
                         cpuLimit = mConstants.POWER_CHECK_MAX_CPU_2;
                     } else if (checkDur <= (mConstants.POWER_CHECK_INTERVAL*3)) {
                         cpuLimit = mConstants.POWER_CHECK_MAX_CPU_3;
-                    } else {
+                    } else if ((app.info.packageName.equals("com.oushang.screen"))
+                       && (checkDur <= (mConstants.POWER_CHECK_INTERVAL*12))) {
+                       Slog.d(TAG,"~~~zjy screen delay 1 hour");
+                       cpuLimit = mConstants.POWER_CHECK_MAX_CPU_3;
+                   } else {
                         cpuLimit = mConstants.POWER_CHECK_MAX_CPU_4;
                     }
                     if (((cputimeUsed*100)/uptimeSince) >= cpuLimit) {

后面发现不行，主要是进入这个条件 checkDur <= (mConstants.POWER_CHECK_INTERVAL*3)之后，直接就开始杀进程，后面优化内容如下：

--- a/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -24656,14 +24656,22 @@ public class ActivityManagerService extends IActivityManager.Stub
                             || app.setProcState <= ActivityManager.PROCESS_STATE_HOME) {
                         cpuLimit = mConstants.POWER_CHECK_MAX_CPU_2;
                     } else if (checkDur <= (mConstants.POWER_CHECK_INTERVAL*3)) {
-                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_3;
-                    } else if ((app.info.packageName.equals("com.oushang.screen"))
-                       && (checkDur <= (mConstants.POWER_CHECK_INTERVAL*12))) {
+                       Slog.d(TAG,"~~~zjy screen delay POWER_CHECK_INTERVAL*3"+",packageName:"+app.info.packageName);
+                        if (app.info.packageName.equals("com.oushang.screen")) {
+                            Slog.d(TAG,"~~~zjy screen delay 1 hour");
+                            cpuLimit = mConstants.POWER_CHECK_MAX_CPU_2;
+                        } else {
+                            cpuLimit = mConstants.POWER_CHECK_MAX_CPU_3;
+                        }
+                   } else if ((app.info.packageName.equals("com.oushang.screen"))
+                       && (checkDur < (mConstants.POWER_CHECK_INTERVAL*12))) {
                        Slog.d(TAG,"~~~zjy screen delay 1 hour");
                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_3;
                    } else {
+                       Slog.d(TAG,"~~~zjy screen delay POWER_CHECK_MAX_CPU_4"+",packageName:"+app.info.packageName);
                         cpuLimit = mConstants.POWER_CHECK_MAX_CPU_4;
                     }
+                   Slog.d(TAG, "~~~zjy screen delay cputimeUsed:"+cputimeUsed*100+",uptimeSince:"+uptimeSince+",cpuLimit:"+cpuLimit+
                     if (((cputimeUsed*100)/uptimeSince) >= cpuLimit) {
                         synchronized (stats) {
                             stats.reportExcessiveCpuLocked(app.info.uid, app.processName,

修改后的内容如下：

// What is the limit for this process?
                    int cpuLimit;
                    long checkDur = curUptime - app.whenUnimportant;
                    if (checkDur <= mConstants.POWER_CHECK_INTERVAL) {
                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_1;
                    } else if (checkDur <= (mConstants.POWER_CHECK_INTERVAL*2)
                            || app.setProcState <= ActivityManager.PROCESS_STATE_HOME) {
                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_2;
                    } else if (checkDur <= (mConstants.POWER_CHECK_INTERVAL*3)) {
                        Slog.d(TAG,"~~~zjy screen delay POWER_CHECK_INTERVAL*3"+",packageName:"+app.info.packageName);
                        if (app.info.packageName.equals("com.oushang.screen")) {
                            Slog.d(TAG,"~~~zjy screen delay 1 hour");
                            cpuLimit = mConstants.POWER_CHECK_MAX_CPU_2;
                        } else {
                            cpuLimit = mConstants.POWER_CHECK_MAX_CPU_3;
                        }
                    } else if ((app.info.packageName.equals("com.oushang.screen"))
                        && (checkDur < (mConstants.POWER_CHECK_INTERVAL*12))) {
                        Slog.d(TAG,"~~~zjy screen delay 1 hour");
                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_2;
                    } else {
                        Slog.d(TAG,"~~~zjy screen delay POWER_CHECK_MAX_CPU_4"+",packageName:"+app.info.packageName);
                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_4;
                    }
                    Slog.d(TAG, "~~~zjy screen delay cputimeUsed:"+cputimeUsed*100+",uptimeSince:"+uptimeSince+",cpuLimit:"+cpuLimit+",checkDur:"+checkDur);
                    if (((cputimeUsed*100)/uptimeSince) >= cpuLimit) {
                        synchronized (stats) {
                            stats.reportExcessiveCpuLocked(app.info.uid, app.processName,
                                    uptimeSince, cputimeUsed);
                        }