commit 640261cf1b5cc4a7d3cfecb8d607358e867fcc69
author Vishnu Nair <vishnun@google.com> Thu Sep 21 21:22:51 2023 -0700
committer Vishnu Nair <vishnun@google.com> Thu Sep 21 21:55:20 2023 -0700
tree b7a1ed8cb23281987da6a929b8c2d2e3f3586a35
parent d49c9783cf00b3863485fa5ce572d1259757a2a9

[sf] add a backdoor to disable transaction tracing

Test: adb shell service call SurfaceFlinger 1041 i32 -1
Bug: 298240242
Change-Id: If07b1d538d6ae1ec43b8611183085741c281c089

services/surfaceflinger/SurfaceFlinger.cpp

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index fadde51..d5b1140 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -7027,7 +7027,10 @@
             }
             case 1041: { // Transaction tracing
                 if (mTransactionTracing) {
-                    if (data.readInt32()) {
+                    int arg = data.readInt32();
+                    if (arg == -1) {
+                        mTransactionTracing.reset();
+                    } else if (arg > 0) {
                         // Transaction tracing is always running but allow the user to temporarily
                         // increase the buffer when actively debugging.
                         mTransactionTracing->setBufferSize(