Rework the LRU list for hidden and empty processes.
This is intended to solve a problem on devices with more memory
where we can fill up that memory with processes that contain activities
(hidden processes), leaving no room for empty processes. Thus if a
process is receiving broadcasts regularly, or starting and stopping
a service, or such, we will continually create its process only to
have it immediately killed when done.
There is certainly some tuning that should be done on this as we
look at the actually behavior. The implementation here puts all of
the hidden and empty processes into one list, trying to make some
preferences for the very most recently used activity's processes to
stay at the top and not get pushed out by other processes being
started in the background.
diff --git a/services/java/com/android/server/am/ProcessRecord.java b/services/java/com/android/server/am/ProcessRecord.java
index 6202257..28195ce 100644
--- a/services/java/com/android/server/am/ProcessRecord.java
+++ b/services/java/com/android/server/am/ProcessRecord.java
@@ -28,6 +28,7 @@
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
+import android.os.SystemClock;
import android.util.PrintWriterPrinter;
import java.io.PrintWriter;
@@ -50,6 +51,8 @@
// are in the process of launching the app)
int pid; // The process of this application; 0 if none
boolean starting; // True if the process is being started
+ long lastActivityTime; // For managing the LRU list
+ long lruWeight; // Weight for ordering in LRU list
int maxAdj; // Maximum OOM adjustment for this process
int hiddenAdj; // If hidden, this is the adjustment to use
int curRawAdj; // Current OOM unlimited adjustment for this process
@@ -73,6 +76,8 @@
long lastRequestedGc; // When we last asked the app to do a gc
long lastLowMemory; // When we last told the app that memory is low
boolean reportLowMemory; // Set to true when waiting to report low mem
+ boolean empty; // Is this an empty background process?
+ boolean hidden; // Is this a hidden process?
int lastPss; // Last pss size reported by app.
String adjType; // Debugging: primary thing impacting oom_adj.
int adjTypeCode; // Debugging: adj code to report to app.
@@ -108,6 +113,7 @@
boolean waitedForDebugger; // has process show wait for debugger dialog?
Dialog waitDialog; // current wait for debugger dialog
+ String shortStringName; // caching of toShortString() result.
String stringName; // caching of toString() result.
// These reports are generated & stored when an app gets into an error condition.
@@ -120,6 +126,7 @@
ComponentName errorReportReceiver;
void dump(PrintWriter pw, String prefix) {
+ long now = SystemClock.uptimeMillis();
if (info.className != null) {
pw.print(prefix); pw.print("class="); pw.println(info.className);
}
@@ -149,6 +156,10 @@
pw.print(" curReceiver="); pw.println(curReceiver);
pw.print(prefix); pw.print("pid="); pw.print(pid); pw.print(" starting=");
pw.print(starting); pw.print(" lastPss="); pw.println(lastPss);
+ pw.print(prefix); pw.print("lastActivityTime="); pw.print(lastActivityTime);
+ pw.print(" lruWeight="); pw.println(lruWeight);
+ pw.print(" hidden="); pw.print(hidden);
+ pw.print(" empty="); pw.println(empty);
pw.print(prefix); pw.print("oom: max="); pw.print(maxAdj);
pw.print(" hidden="); pw.print(hiddenAdj);
pw.print(" curRaw="); pw.print(curRawAdj);
@@ -220,6 +231,7 @@
public void setPid(int _pid) {
pid = _pid;
+ shortStringName = null;
stringName = null;
}
@@ -256,12 +268,16 @@
}
}
- public String toString() {
- if (stringName != null) {
- return stringName;
+ public String toShortString() {
+ if (shortStringName != null) {
+ return shortStringName;
}
StringBuilder sb = new StringBuilder(128);
- sb.append("ProcessRecord{");
+ toShortString(sb);
+ return shortStringName = sb.toString();
+ }
+
+ void toShortString(StringBuilder sb) {
sb.append(Integer.toHexString(System.identityHashCode(this)));
sb.append(' ');
sb.append(pid);
@@ -269,6 +285,15 @@
sb.append(processName);
sb.append('/');
sb.append(info.uid);
+ }
+
+ public String toString() {
+ if (stringName != null) {
+ return stringName;
+ }
+ StringBuilder sb = new StringBuilder(128);
+ sb.append("ProcessRecord{");
+ toShortString(sb);
sb.append('}');
return stringName = sb.toString();
}