Reset flow event cache before each perfetto event

This was just an omission. The omission led to a performance
regression (code was still logically correct) where we will
create a new Flow object on every trace event. This was
expensive and led to GC churn.

Change-Id: Idb027748f1bf3a44e1dfae7c666be4688b2e9338
Test: atest PerfettoTest
Test: atest TracePerfTest
Bug: 303199244 
Flag: android.os.perfetto_sdk_tracing_v2

1 files changed, 1 insertions, 0 deletions

diff --git a/core/java/android/os/PerfettoTrackEventExtra.java b/core/java/android/os/PerfettoTrackEventExtra.java
index 32fbea4ff4c2..adb98aa25f8f 100644
--- a/core/java/android/os/PerfettoTrackEventExtra.java
+++ b/core/java/android/os/PerfettoTrackEventExtra.java
@@ -442,6 +442,7 @@ public final class PerfettoTrackEventExtra {
             mFieldStringCache.reset();
             mFieldNestedCache.reset();
             mBuilderCache.reset();
+            mFlowCache.reset();
 
             mExtra.reset();
             // Reset after on init in case the thread created builders without calling emit