diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 875bef1..5be1e28 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -1520,6 +1520,7 @@
     rebuildLayerStacks();
     setUpHWComposer();
     doDebugFlashRegions();
+    doTracing("handleRefresh");
     doComposition();
     postComposition(refreshStartTime);
 
@@ -1579,6 +1580,14 @@
     }
 }
 
+void SurfaceFlinger::doTracing(const char* where) {
+    ATRACE_CALL();
+    ATRACE_NAME(where);
+    if (CC_UNLIKELY(mTracing.isEnabled())) {
+        mTracing.traceLayers(where, dumpProtoInfo());
+    }
+}
+
 void SurfaceFlinger::preComposition(nsecs_t refreshStartTime)
 {
     ATRACE_CALL();
@@ -4230,6 +4239,20 @@
                 reply->writeBool(hasWideColorDisplay);
                 return NO_ERROR;
             }
+            case 1025: { // tracing
+                n = data.readInt32();
+                if (n) {
+                    ALOGV("LayerTracing enabled");
+                    mTracing.enable();
+                    doTracing("tracing.enable");
+                    reply->writeInt32(NO_ERROR);
+                } else {
+                    ALOGV("LayerTracing disabled");
+                    status_t err = mTracing.disable();
+                    reply->writeInt32(err);
+                }
+                return NO_ERROR;
+            }
         }
     }
     return err;