diff --git a/llvm/utils/lit/lit/reports.py b/llvm/utils/lit/lit/reports.py
--- a/llvm/utils/lit/lit/reports.py
+++ b/llvm/utils/lit/lit/reports.py
@@ -74,14 +74,13 @@
         self.skipped_codes = {lit.Test.EXCLUDED,
                               lit.Test.SKIPPED, lit.Test.UNSUPPORTED}
 
-    # TODO(yln): elapsed unused, put it somewhere?
     def write_results(self, tests, elapsed):
         tests.sort(key=by_suite_and_test_path)
         tests_by_suite = itertools.groupby(tests, lambda t: t.suite)
 
         with open(self.output_file, 'w') as file:
             file.write('<?xml version="1.0" encoding="UTF-8"?>\n')
-            file.write('<testsuites>\n')
+            file.write('<testsuites time="{time:.2f}">\n'.format(time=elapsed))
             for suite, test_iter in tests_by_suite:
                 self._write_testsuite(file, suite, list(test_iter))
             file.write('</testsuites>\n')