Android/frameworks_base
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Reduce memory usage.

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1. Make sure strings are interned so that memory isn't wasted on duplicate
   strings.
2. Most of the memory used by the TARE system was made up of the
   Transaction objects. The Transaction history is only kept for
   debugging purposes, so it can be reduced without affecting the
   policy. Reduce the number of transactions kept in memory by 92% for
   user builds to reduce the memory used by the TARE system by 90-92%.

Bug: 288479057
Test: atest frameworks/base/services/tests/mockingservicestests/src/com/android/server/tare
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/tare
Change-Id: Ic12a54a3d12be60a7fe20bb62931e8f2e62f1475
This commit is contained in:
Kweku Adams
2023-06-22 21:13:04 +00:00
parent f63877d380
commit 28b2c8a86c
1 changed files with 8 additions and 2 deletions
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10
apex/jobscheduler/service/java/com/android/server/tare/Ledger.java
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@@ -25,7 +25,9 @@ import static com.android.server.tare.TareUtils.getCurrentTimeMillis;
import android.annotation.CurrentTimeMillisLong;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.os.Build;
import android.util.IndentingPrintWriter;
import android.util.Log;
import android.util.SparseLongArray;
import android.util.TimeUtils;
@@ -38,6 +40,10 @@ import java.util.List;
* Ledger to track the last recorded balance and recent activities of an app.
*/
class Ledger {
private static final String TAG = "TARE-" + Ledger.class.getSimpleName();
private static final boolean DEBUG = InternalResourceService.DEBUG
|| Log.isLoggable(TAG, Log.DEBUG);
/** The window size within which rewards will be counted and used towards reward limiting. */
private static final long TOTAL_REWARD_WINDOW_MS = 24 * HOUR_IN_MILLIS;
/** The number of buckets to split {@link #TOTAL_REWARD_WINDOW_MS} into. */
@@ -51,7 +57,7 @@ class Ledger {
TOTAL_REWARD_WINDOW_MS / NUM_REWARD_BUCKET_WINDOWS;
/** The maximum number of transactions to retain in memory at any one time. */
@VisibleForTesting
static final int MAX_TRANSACTION_COUNT = 50;
static final int MAX_TRANSACTION_COUNT = Build.IS_ENG || Build.IS_USERDEBUG || DEBUG ? 32 : 4;
static class Transaction {
public final long startTimeMs;
@@ -67,7 +73,7 @@ class Ledger {
this.startTimeMs = startTimeMs;
this.endTimeMs = endTimeMs;
this.eventId = eventId;
this.tag = tag;
this.tag = tag == null ? null : tag.intern();
this.delta = delta;
this.ctp = ctp;
}