gh-142927: Show self time in flamegraph tooltip (#147706)

We already show self time in differential flamegraphs, but it should
be included in regular flamegraphs as well. Display the time spent
in the function body excluding callees, not just the total inclusive
time.

Author: ivonastojanovic

Lib/profiling/sampling/_flamegraph_assets/flamegraph.js

@@ -292,6 +292,8 @@ function createPythonTooltip(data) {
     }
 
     const timeMs = (d.data.value / 1000).toFixed(2);
+    const selfSamples = d.data.self || 0;
+    const selfMs = (selfSamples / 1000).toFixed(2);
     const percentage = ((d.data.value / data.value) * 100).toFixed(2);
     const calls = d.data.calls || 0;
     const childCount = d.children ? d.children.length : 0;
@@ -403,9 +405,14 @@ function createPythonTooltip(data) {
         ${fileLocationHTML}
       </div>
       <div class="tooltip-stats">
-        <span class="tooltip-stat-label">Execution Time:</span>
+        <span class="tooltip-stat-label">Total Time:</span>
         <span class="tooltip-stat-value">${timeMs} ms</span>
 
+        ${selfSamples > 0 ? `
+          <span class="tooltip-stat-label">Self Time:</span>
+          <span class="tooltip-stat-value">${selfMs} ms</span>
+        ` : ''}
+
         <span class="tooltip-stat-label">Percentage:</span>
         <span class="tooltip-stat-value accent">${percentage}%</span>
 
@@ -1271,6 +1278,7 @@ function accumulateInvertedNode(parent, stackFrame, leaf, isDifferential) {
     const newNode = {
       name: stackFrame.name,
       value: 0,
+      self: 0,
       children: {},
       filename: stackFrame.filename,
       lineno: stackFrame.lineno,
@@ -1293,6 +1301,7 @@ function accumulateInvertedNode(parent, stackFrame, leaf, isDifferential) {
 
   const node = parent.children[key];
   node.value += leaf.value;
+  node.self += stackFrame.self || 0;
   if (leaf.threads) {
     leaf.threads.forEach(t => node.threads.add(t));
   }

Lib/profiling/sampling/stack_collector.py

@@ -207,6 +207,7 @@ def convert_children(children, min_samples):
                 child_entry = {
                     "name": name_idx,
                     "value": samples,
+                    "self": node.get("self", 0),
                     "children": [],
                     "filename": filename_idx,
                     "lineno": func[1],

Lib/test/test_profiling/test_sampling_profiler/test_collectors.py

@@ -435,12 +435,14 @@ def test_flamegraph_collector_basic(self):
         strings = data.get("strings", [])
         name = resolve_name(data, strings)
         self.assertTrue(name.startswith("Program Root: "))
-        self.assertIn("func2 (file.py:20)", name)  # formatted name
+        self.assertIn("func2 (file.py:20)", name)
+        self.assertEqual(data["self"], 0)  # non-leaf: no self time
         children = data.get("children", [])
         self.assertEqual(len(children), 1)
         child = children[0]
         self.assertIn("func1 (file.py:10)", resolve_name(child, strings))
         self.assertEqual(child["value"], 1)
+        self.assertEqual(child["self"], 1)  # leaf: all time is self
 
     def test_flamegraph_collector_export(self):
         """Test flamegraph HTML export functionality."""