Bug 1873649: Add regression perf test. r=firefox-style-system-reviewe…

…rs,perftest-reviewers,emilio,sparky, a=dmeehan Differential Revision: https://phabricator.services.mozilla.com/D198209
dothq · Jan 11, 2024 · 5c241eb · 5c241eb
1 parent 8453e0a
commit 5c241eb
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diff --git a/testing/talos/talos/tests/perf-reftest-singletons/README b/testing/talos/talos/tests/perf-reftest-singletons/README
@@ -10,4 +10,5 @@ To add a test:
  iii) The test steps.
   iv) A call to perf_finish().
 3)  Add your test to the perf_reftest_singletons.manifest file.
-4)  Add your test to the list in build/pgo/index.html.
+4)  Add your test to the list in build/pgo/index.html, if it should be used
+    for profile-guided optimization.
diff --git a/testing/talos/talos/tests/perf-reftest-singletons/perf_reftest_singletons.manifest b/testing/talos/talos/tests/perf-reftest-singletons/perf_reftest_singletons.manifest
@@ -1,4 +1,4 @@
-# When modifying this list, please also update build/pgo/index.html.
+# When modifying this list, please also update build/pgo/index.html (If relevant to profile-guided optimzation).
 % http://localhost/tests/perf-reftest-singletons/abspos-reflow-1.html
 % http://localhost/tests/perf-reftest-singletons/attr-selector-1.html
 % http://localhost/tests/perf-reftest-singletons/bidi-resolution-1.html
@@ -35,4 +35,5 @@
 % http://localhost/tests/perf-reftest-singletons/svg-text-getExtentOfChar-1.html
 % http://localhost/tests/perf-reftest-singletons/tiny-traversal-singleton.html
 % http://localhost/tests/perf-reftest-singletons/window-named-property-get.html
-# When modifying this list, please also update build/pgo/index.html.
+% http://localhost/tests/perf-reftest-singletons/remove-children.html
+# When modifying this list, please also update build/pgo/index.html (If relevant to profile-guided optimzation).
diff --git a/testing/talos/talos/tests/perf-reftest-singletons/remove-children.html b/testing/talos/talos/tests/perf-reftest-singletons/remove-children.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<table id="dut">
+</table>
+<script src="util.js"></script>
+<script>
+window.onload = function() {
+  // From https://build.opensuse.org/project/show/openSUSE:Leap:15.5
+  const N = 40000;
+  let elements = new Array(N);
+  // Add lots of rows with newline in between
+  for (let i = 0; i < N; i++) {
+    let d = document.createElement("tr");
+    dut.appendChild(d);
+    elements[i] = d;
+    dut.appendChild(document.createTextNode("\n"));
+  }
+
+  flush_layout();
+  perf_start();
+  // Delete all from front. Text nodes of newlines will accumulate
+  // at the start of the table.
+  for (let i = 0; i < elements.length; i++) {
+    let d = elements[i];
+    d.remove();
+  }
+  flush_layout();
+  perf_finish();
+};
+</script>
+<body></body>