diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index f6f71ae..446d744 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -2168,7 +2168,7 @@
 
     if (mLayerTracingEnabled && !mLayerTracing.flagIsSet(LayerTracing::TRACE_COMPOSITION)) {
         // This will block and tracing should only be enabled for debugging.
-        mLayerTracing.notify(mVisibleRegionsDirty, frameTime);
+        mLayerTracing.notify(mVisibleRegionsDirty, frameTime, vsyncId);
     }
 
     persistDisplayBrightness(mustComposite);
@@ -2295,7 +2295,7 @@
     mLayersWithQueuedFrames.clear();
     if (mLayerTracingEnabled && mLayerTracing.flagIsSet(LayerTracing::TRACE_COMPOSITION)) {
         // This will block and should only be used for debugging.
-        mLayerTracing.notify(mVisibleRegionsDirty, frameTime);
+        mLayerTracing.notify(mVisibleRegionsDirty, frameTime, vsyncId);
     }
 
     mVisibleRegionsWereDirtyThisFrame = mVisibleRegionsDirty; // Cache value for use in post-comp
@@ -5846,7 +5846,8 @@
                                 (fixedStartingTime) ? fixedStartingTime : systemTime();
                         mScheduler
                                 ->schedule([&]() FTL_FAKE_GUARD(mStateLock) {
-                                    mLayerTracing.notify("start", startingTime);
+                                    mLayerTracing.notify(true /* visibleRegionDirty */,
+                                                         startingTime, -1 /* vsyncId */);
                                 })
                                 .wait();
                     }
diff --git a/services/surfaceflinger/Tracing/LayerTracing.cpp b/services/surfaceflinger/Tracing/LayerTracing.cpp
index 49554c7..1b80fa3 100644
--- a/services/surfaceflinger/Tracing/LayerTracing.cpp
+++ b/services/surfaceflinger/Tracing/LayerTracing.cpp
@@ -98,7 +98,7 @@
     mBuffer->dump(result);
 }
 
-void LayerTracing::notify(bool visibleRegionDirty, int64_t time) {
+void LayerTracing::notify(bool visibleRegionDirty, int64_t time, int64_t vsyncId) {
     std::scoped_lock lock(mTraceLock);
     if (!mEnabled) {
         return;
@@ -130,6 +130,7 @@
     }
     mFlinger.dumpDisplayProto(entry);
     mBuffer->emplace(std::move(entry));
+    entry.set_vsync_id(vsyncId);
 }
 
 } // namespace android
diff --git a/services/surfaceflinger/Tracing/LayerTracing.h b/services/surfaceflinger/Tracing/LayerTracing.h
index 88a19ec..e73dac6 100644
--- a/services/surfaceflinger/Tracing/LayerTracing.h
+++ b/services/surfaceflinger/Tracing/LayerTracing.h
@@ -47,7 +47,7 @@
     bool isEnabled() const;
     status_t writeToFile();
     LayersTraceFileProto createTraceFileProto() const;
-    void notify(bool visibleRegionDirty, int64_t time);
+    void notify(bool visibleRegionDirty, int64_t time, int64_t vsyncId);
 
     enum : uint32_t {
         TRACE_INPUT = 1 << 1,
diff --git a/services/surfaceflinger/layerproto/layerstrace.proto b/services/surfaceflinger/layerproto/layerstrace.proto
index 13647b6..7def024 100644
--- a/services/surfaceflinger/layerproto/layerstrace.proto
+++ b/services/surfaceflinger/layerproto/layerstrace.proto
@@ -40,7 +40,7 @@
     repeated LayersTraceProto entry = 2;
 }
 
-/* one window manager trace entry. */
+/* one layers trace entry. */
 message LayersTraceProto {
     /* required: elapsed realtime in nanos since boot of when this entry was logged */
     optional sfixed64 elapsed_realtime_nanos = 1;
@@ -60,4 +60,6 @@
     optional uint32 missed_entries = 6;
 
     repeated DisplayProto displays = 7;
+
+    optional int64 vsync_id = 8;
 }