Merge "Add classloading insights to the Perfetto app startup plugin."…

… into main

src/trace_processor/perfetto_sql/stdlib/android/startup/startups.sql

@@ -271,6 +271,29 @@ SELECT slice_id, slice_name, slice_ts, slice_dur, thread_name, tid, arg_set_id
 FROM android_thread_slices_for_all_startups
 WHERE startup_id = $startup_id AND slice_name GLOB $slice_name;
 
+-- A Perfetto view that lists matching slices for class loading during app startup.
+CREATE PERFETTO VIEW android_class_loading_for_startup(
+  -- Id of the slice.
+  slice_id JOINID(slice.id),
+  -- Startup id.
+  startup_id LONG,
+  -- Name of the slice.
+  slice_name STRING,
+  -- Timestamp of start of the slice.
+  slice_ts TIMESTAMP,
+  -- Duration of the slice.
+  slice_dur DURATION,
+  -- Name of the thread with the slice.
+  thread_name STRING,
+  -- Tid of the thread with the slice.
+  tid  LONG,
+  -- Arg set id.
+  arg_set_id ARGSETID
+) AS
+SELECT slice_id, startup_id, slice_name, slice_ts, slice_dur, thread_name, tid, arg_set_id
+FROM android_thread_slices_for_all_startups
+WHERE slice_name GLOB "L*;";
+
 -- Returns binder transaction slices for a given startup id with duration over threshold.
 CREATE PERFETTO FUNCTION android_binder_transaction_slices_for_startup(
   -- Startup id.

ui/src/plugins/dev.perfetto.AndroidStartup/optimizations.ts

@@ -49,6 +49,7 @@ export async function optimizationsTrack(
   trace: Trace,
 ): Promise<TrackNode | undefined> {
   const startups: Array<Startup> = [];
+  const classLoadingTracks: Array<Promise<TrackNode>> = [];
 
   // Find app startups
   let result = await trace.engine.query(
@@ -95,6 +96,8 @@ export async function optimizationsTrack(
         }
       }
     }
+    const childTrack = classLoadingTrack(trace, startup);
+    classLoadingTracks.push(childTrack);
   }
 
   // Create the optimizations track and also avoid re-querying for the data we already have.
@@ -125,6 +128,37 @@ export async function optimizationsTrack(
     title,
     track,
   });
+  const trackNode = new TrackNode({title, uri});
+  for await (const classLoadingTrack of classLoadingTracks) {
+    trackNode.addChildLast(classLoadingTrack);
+  }
+  return trackNode;
+}
+
+async function classLoadingTrack(
+  trace: Trace,
+  startup: Startup,
+): Promise<TrackNode> {
+  const sqlSource = `
+    SELECT slice_ts as ts, slice_dur as dur, slice_name AS name FROM
+      android_class_loading_for_startup
+      WHERE startup_id = ${startup.id}
+  `;
+  const uri = `/android_startups/${startup.id}/classloading`;
+  const title = `Classloading for (${startup.package})`;
+  const track = await createQuerySliceTrack({
+    trace: trace,
+    uri: uri,
+    data: {
+      sqlSource: sqlSource,
+      columns: ['ts', 'dur', 'name'],
+    },
+  });
+  trace.tracks.registerTrack({
+    uri,
+    title,
+    track,
+  });
   return new TrackNode({title, uri});
 }