Use GetByKey() in typeLister_NonNamespacedGet

The Get() function of non-namespace lister passes a temporary object to
indexer.Get() in order to fetch the actual object from the indexer. This
may cause Go to allocate the temporary object on the heap instead of the
stack, as it is passed into interfaces. For non-namespaced objects,
Get(&Type{ObjectMeta: v1.ObjectMeta{Name: name}}) should be equivalent
to GetByKey(name).

This could be the root cause of excessive allocations, e.g. in tests
clusterRoleLister.Get() has trigger 4 billion allocations. See
openshift/origin#16954

Signed-off-by: Christian Heimes <[email protected]>

Kubernetes-commit: d57280efb2d387d50b80b40c7d585ea282eba8c4

Author: tiran

cmd/lister-gen/generators/lister.go

@@ -322,8 +322,7 @@ func (s *$.type|private$Lister) $.type|publicPlural$(namespace string) $.type|pu
 var typeLister_NonNamespacedGet = `
 // Get retrieves the $.type|public$ from the index for a given name.
 func (s *$.type|private$Lister) Get(name string) (*$.type|raw$, error) {
-  key := &$.type|raw${ObjectMeta: $.objectMeta|raw${Name: name}}
-  obj, exists, err := s.indexer.Get(key)
+  obj, exists, err := s.indexer.GetByKey(name)
   if err != nil {
     return nil, err
   }