Add cheap aidl tracing suitable for always-on-tracing (1/3)

Instead of having only one switch to enable all binder tracing,
we seperate between stack tracking and tracing. Stack tracking
still works as before. However, the more lightweight option,
tracing using android.os.Trace, is toggleable separately and will
work on the receiver side without dumping the entire stack trace.

We also make the tracing more efficient by caching
getTransactionName and concatting the class name.

Also, enable this selectively for SysUI+Launcher, which is
currently the focus of always-on-tracing effort to figure out
what kind of binder calls these processes are calling which seems
to contribute a huge amount of jank (long binder calls are in
>= 50% of janky traces).

Test: external/perfetto/tools/record_android_trace gfx view freq sched wm am aidl
Test: atest aidl_unittests
Bug: 202278427
Change-Id: I4d803d073cc4b69d07fa433bfef7e1c7f45132b7

1 files changed, 3 insertions, 5 deletions

diff --git a/core/java/android/util/IntArray.java b/core/java/android/util/IntArray.java
index b77265b0ebf6..7b28b8a607de 100644
--- a/core/java/android/util/IntArray.java
+++ b/core/java/android/util/IntArray.java
@@ -34,7 +34,7 @@ public class IntArray implements Cloneable {
     private int[] mValues;
     private int mSize;
 
-    private  IntArray(int[] array, int size) {
+    private IntArray(int[] array, int size) {
         mValues = array;
         mSize = Preconditions.checkArgumentInRange(size, 0, array.length, "size");
     }
@@ -178,10 +178,8 @@ public class IntArray implements Cloneable {
     }
 
     @Override
-    public IntArray clone() throws CloneNotSupportedException {
-        final IntArray clone = (IntArray) super.clone();
-        clone.mValues = mValues.clone();
-        return clone;
+    public IntArray clone() {
+        return new IntArray(mValues.clone(), mSize);
     }
 
     /**