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Removes the hidden tasks that exceeds the cache limit

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Allows the system to cache a small number of hidden tasks and
remove the oldest hidden task when exceeds the cache limit.

Bug: 288627637
Bug: 166143360
Test: atest RecentTasksTest
Change-Id: Ibb0a61fb1fa3543e8d6b6982d1b6f8325982abcb
This commit is contained in:
Louis Chang
2023-07-13 03:24:13 +00:00
parent 27fbbeb252
commit f03c90017e
1 changed files with 9 additions and 3 deletions
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12
services/core/java/com/android/server/wm/RecentTasks.java
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@@ -183,6 +183,8 @@ class RecentTasks {
/** The non-empty tasks that are removed from recent tasks (see {@link #removeForAddTask}). */
private final ArrayList<Task> mHiddenTasks = new ArrayList<>();
/** The maximum size that the hidden tasks are cached. */
private static final int MAX_HIDDEN_TASK_SIZE = 10;
/** Whether to trim inactive tasks when activities are idle. */
private boolean mCheckTrimmableTasksOnIdle;
@@ -1477,9 +1479,13 @@ class RecentTasks {
return task.compareTo(rootHomeTask) < 0;
}
/** Remove the tasks that user may not be able to return. */
/** Remove the tasks that user may not be able to return when exceeds the cache limit. */
private void removeUnreachableHiddenTasks(int windowingMode) {
for (int i = mHiddenTasks.size() - 1; i >= 0; i--) {
final int size = mHiddenTasks.size();
if (size <= MAX_HIDDEN_TASK_SIZE) {
return;
}
for (int i = size - 1; i >= MAX_HIDDEN_TASK_SIZE; i--) {
final Task hiddenTask = mHiddenTasks.get(i);
if (!hiddenTask.hasChild() || hiddenTask.inRecents) {
// The task was removed by other path or it became reachable (added to recents).
@@ -1523,7 +1529,7 @@ class RecentTasks {
// A non-empty task is replaced by a new task. Because the removed task is no longer
// managed by the recent tasks list, add it to the hidden list to prevent the task
// from becoming dangling.
mHiddenTasks.add(removedTask);
mHiddenTasks.add(0, removedTask);
}
notifyTaskRemoved(removedTask, false /* wasTrimmed */, false /* killProcess */);
if (DEBUG_RECENTS_TRIM_TASKS) {