[PATCH 6/6] perf test attr: Relax group checking for ungrouped expectations

[Arnaldo Carvalho de Melo]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

When matching the recorded events back against the expectations,
attr.py requires every event opened in a group to match an expectation
that declares the same group.  The perf stat default metrics open the
events of each metric in groups, but the test expectations only verify
the event attributes, so test-stat-default fails with:

  FAILED '.../test-stat-default' - group failure

Only enforce the group of a recorded event when the expectation it
matches declares one.  Expectations that ask for a group are still
verified in both directions.

Fixes: c7adeb0974f18da4 ("perf jevents: Add set of common metrics based on default ones")
Fixes: 2dfc0cab3da4a205 ("perf stat: Add detail -d,-dd,-ddd metrics")
Assisted-by: LLM
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/tests/shell/lib/attr.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/tools/perf/tests/shell/lib/attr.py b/tools/perf/tests/shell/lib/attr.py
index 68f06df9565a0811..3319abfd451c4e4f 100644
--- a/tools/perf/tests/shell/lib/attr.py
+++ b/tools/perf/tests/shell/lib/attr.py
@@ -309,7 +309,7 @@ class Test(object):
             else:
                 raise Unsup(self)
 
-    def compare(self, expect, result):
+    def compare(self, expect, result, strict_groups=True):
         match = {}
 
         log.debug("  compare")
@@ -344,7 +344,10 @@ class Test(object):
             match[exp_name] = exp_list
 
         # For each defined group in the expected events
-        # check we match the same group in the result.
+        # check we match the same group in the result. When matching
+        # the result back against the expectations, events opened in a
+        # group may match an expectation that doesn't request a group,
+        # as such expectations only verify the event attributes.
         for exp_name, exp_event in expect.items():
             group = exp_event.group
 
@@ -353,6 +356,8 @@ class Test(object):
 
             for res_name in match[exp_name]:
                 res_group = result[res_name].group
+                if res_group == '' and not strict_groups:
+                    continue
                 if res_group not in match[group]:
                     raise Fail(self, 'group failure')
 
@@ -391,7 +396,7 @@ class Test(object):
 
             # do the expectation - results matching - both ways
             self.compare(self.expect, self.result)
-            self.compare(self.result, self.expect)
+            self.compare(self.result, self.expect, strict_groups=False)
 
         finally:
             # cleanup
-- 
2.55.0