perf jevents: Add more components to the metric sorting order

Nazar Kazakov reported non-deterministic builds due to the metrics
being reordered in the jevents.py output. The metrics were largely
only being sorted by name, add in the expressions and descriptions.

Reported-by: Nazar Kazakov <nazar.kazakov@codethink.co.uk>
Closes: https://lore.kernel.org/linux-perf-users/20260706175624.692736-1-nazar.kazakov@codethink.co.uk/
Fixes: 40769665b6 ("perf jevents: Parse metrics during conversion")
Tested-by: Nazar Kazakov <nazar.kazakov@codethink.co.uk>
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/pmu-events/jevents.py

@@ -574,13 +574,14 @@ static const struct pmu_table_entry {_pending_events_tblname}[] = {{
 def print_pending_metrics() -> None:
   """Optionally close metrics table."""
 
-  def metric_cmp_key(j: JsonEvent) -> Tuple[bool, str, str]:
+  def metric_cmp_key(j: JsonEvent) -> Tuple[str, str, str, str]:
     def fix_none(s: Optional[str]) -> str:
       if s is None:
         return ''
       return s
 
-    return (j.desc is not None, fix_none(j.pmu), fix_none(j.metric_name))
+    return (fix_none(j.pmu), fix_none(j.metric_name), j.metric_expr.ToPerfJson(),
+            fix_none(j.desc))
 
   global _pending_metrics
   if not _pending_metrics:

tools/perf/pmu-events/metric.py

@@ -623,7 +623,11 @@ class Metric:
 
   def __lt__(self, other):
     """Sort order."""
-    return self.name < other.name
+    if self.name != other.name:
+      return self.name < other.name
+    if not self.expr.Equals(other.expr):
+      return self.expr.ToPerfJson() < other.expr.ToPerfJson()
+    return self.description < other.description
 
   def AddToMetricGroup(self, group):
     """Callback used when being added to a MetricGroup."""