diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index e9eb63f..619bc03 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -4901,9 +4901,9 @@
         code == IBinder::SYSPROPS_TRANSACTION) {
         return OK;
     }
-    // Numbers from 1000 to 1037 are currently used for backdoors. The code
+    // Numbers from 1000 to 1038 are currently used for backdoors. The code
     // in onTransact verifies that the user is root, and has access to use SF.
-    if (code >= 1000 && code <= 1037) {
+    if (code >= 1000 && code <= 1038) {
         ALOGV("Accessing SurfaceFlinger through backdoor code: %u", code);
         return OK;
     }
@@ -5259,6 +5259,21 @@
 
                 return NO_ERROR;
             }
+            // Modify the max number of display frames stored within FrameTimeline
+            case 1038: {
+                n = data.readInt32();
+                if (n < 0 || n > MAX_ALLOWED_DISPLAY_FRAMES) {
+                    ALOGW("Invalid max size. Maximum allowed is %d", MAX_ALLOWED_DISPLAY_FRAMES);
+                    return BAD_VALUE;
+                }
+                if (n == 0) {
+                    // restore to default
+                    mFrameTimeline->reset();
+                    return NO_ERROR;
+                }
+                mFrameTimeline->setMaxDisplayFrames(n);
+                return NO_ERROR;
+            }
         }
     }
     return err;