In a head dump review, LogMessageImpl was seen as serveral

top objects when sorted by size.

This change will set a maximum cap on log size to 20 items for
LogMessageImpl on low_ram (go) devices. This change reduces
the memory footprint of com.android.systemui post-boot.

Test: manual
Bug:188842641
- refer to comment #48
- https://b.corp.google.com/issues/188842641#comment48

Change-Id: I0ef72c629241990e5f5ec877aade5af03626d83f

packages/SystemUI/src/com/android/systemui/log/LogBufferFactory.kt

@@ -16,6 +16,7 @@
 
 package com.android.systemui.log
 
+import android.app.ActivityManager
 import com.android.systemui.dagger.SysUISingleton
 import com.android.systemui.dump.DumpManager
 import javax.inject.Inject
@@ -25,9 +26,18 @@ class LogBufferFactory @Inject constructor(
     private val dumpManager: DumpManager,
     private val logcatEchoTracker: LogcatEchoTracker
 ) {
+    /* limit the size of maxPoolSize for low ram (Go) devices */
+    private fun poolLimit(maxPoolSize_requested: Int): Int {
+        if (ActivityManager.isLowRamDeviceStatic()) {
+            return minOf(maxPoolSize_requested, 20) /* low ram max log size*/
+        } else {
+            return maxPoolSize_requested
+        }
+    }
+
     @JvmOverloads
     fun create(name: String, maxPoolSize: Int, flexSize: Int = 10): LogBuffer {
-        val buffer = LogBuffer(name, maxPoolSize, flexSize, logcatEchoTracker)
+        val buffer = LogBuffer(name, poolLimit(maxPoolSize), flexSize, logcatEchoTracker)
         dumpManager.registerBuffer(name, buffer)
         return buffer
     }