Add timing split for updating app image class loaders

Added since this a non-trivial portion of app image loading time.

Test: test-art-host
Bug: 111397239
Bug: 116052292
Change-Id: I922077a8929a46efaa7f5567beffee6d7b634392

1 files changed, 9 insertions, 5 deletions

diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 9ba52c429d..ff455f6875 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -2034,11 +2034,15 @@ bool ClassLinker::AddImageSpace(
   }
   if (app_image) {
     AppImageLoadingHelper::Update(this, space, class_loader, dex_caches, &temp_set);
-    // Update class loader and resolved strings. If added_class_table is false, the resolved
-    // strings were forwarded UpdateAppImageClassLoadersAndDexCaches.
-    UpdateClassLoaderVisitor visitor(space, class_loader.Get());
-    for (const ClassTable::TableSlot& root : temp_set) {
-      visitor(root.Read());
+
+    {
+      ScopedTrace trace("AppImage:UpdateClassLoaders");
+      // Update class loader and resolved strings. If added_class_table is false, the resolved
+      // strings were forwarded UpdateAppImageClassLoadersAndDexCaches.
+      UpdateClassLoaderVisitor visitor(space, class_loader.Get());
+      for (const ClassTable::TableSlot& root : temp_set) {
+        visitor(root.Read());
+      }
     }
 
     if (kBitstringSubtypeCheckEnabled) {