commit deea0b5d48e17e5c64284d9400501954545dc609
author Jing Ji <jji@google.com> Fri May 17 11:27:18 2024 -0700
committer Jing Ji <jji@google.com> Mon May 20 09:12:56 2024 -0700
tree a5c80ca50bc7f1e1d4585953f7bcb5bff5ecf856
parent d99ad6f8182193d52d2c3d51a000ded9e09fd1e4

Skip background memory trim if the app is in the foreground state

Bug: 308927629
Test: Manual
Change-Id: I96792546c073176d6ce90769bf52f16790565178

core/java/android/app/ActivityThread.java

diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index d4812dd..76c1ed6 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -18,6 +18,7 @@
 
 import static android.app.ActivityManager.PROCESS_STATE_UNKNOWN;
 import static android.app.ConfigurationController.createNewConfigAndUpdateIfNotNull;
+import static android.app.Flags.skipBgMemTrimOnFgApp;
 import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
 import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
 import static android.app.servertransaction.ActivityLifecycleItem.ON_CREATE;
@@ -7078,6 +7079,11 @@
         if (DEBUG_MEMORY_TRIM) Slog.v(TAG, "Trimming memory to level: " + level);
 
         try {
+            if (skipBgMemTrimOnFgApp()
+                    && mLastProcessState <= ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND
+                    && level >= ComponentCallbacks2.TRIM_MEMORY_BACKGROUND) {
+                return;
+            }
             if (level >= ComponentCallbacks2.TRIM_MEMORY_COMPLETE) {
                 PropertyInvalidatedCache.onTrimMemory();
             }

core/java/android/app/activity_manager.aconfig

diff --git a/core/java/android/app/activity_manager.aconfig b/core/java/android/app/activity_manager.aconfig
index bb24fd1..fa646a7 100644
--- a/core/java/android/app/activity_manager.aconfig
+++ b/core/java/android/app/activity_manager.aconfig
@@ -70,3 +70,14 @@
          purpose: PURPOSE_BUGFIX
      }
 }
+
+flag {
+     namespace: "backstage_power"
+     name: "skip_bg_mem_trim_on_fg_app"
+     description: "Skip background memory trim event on foreground processes."
+     is_fixed_read_only: true
+     bug: "308927629"
+     metadata {
+         purpose: PURPOSE_BUGFIX
+     }
+}