Merge branch 'jk/mark-edges-uninteresting'

Fix performance regression in v1.8.4.x and later.

* jk/mark-edges-uninteresting:
  list-objects: only look at cmdline trees with edge_hint
  t/perf: time rev-list with UNINTERESTING commits

list-objects.c

@@ -162,15 +162,17 @@ void mark_edges_uninteresting(struct rev_info *revs, show_edge_fn show_edge)
 		}
 		mark_edge_parents_uninteresting(commit, revs, show_edge);
 	}
-	for (i = 0; i < revs->cmdline.nr; i++) {
-		struct object *obj = revs->cmdline.rev[i].item;
-		struct commit *commit = (struct commit *)obj;
-		if (obj->type != OBJ_COMMIT || !(obj->flags & UNINTERESTING))
-			continue;
-		mark_tree_uninteresting(commit->tree);
-		if (revs->edge_hint && !(obj->flags & SHOWN)) {
-			obj->flags |= SHOWN;
-			show_edge(commit);
+	if (revs->edge_hint) {
+		for (i = 0; i < revs->cmdline.nr; i++) {
+			struct object *obj = revs->cmdline.rev[i].item;
+			struct commit *commit = (struct commit *)obj;
+			if (obj->type != OBJ_COMMIT || !(obj->flags & UNINTERESTING))
+				continue;
+			mark_tree_uninteresting(commit->tree);
+			if (!(obj->flags & SHOWN)) {
+				obj->flags |= SHOWN;
+				show_edge(commit);
+			}
 		}
 	}
 }

t/perf/p0001-rev-list.sh

@@ -14,4 +14,16 @@ test_perf 'rev-list --all --objects' '
 	git rev-list --all --objects >/dev/null
 '
 
+test_expect_success 'create new unreferenced commit' '
+	commit=$(git commit-tree HEAD^{tree} -p HEAD)
+'
+
+test_perf 'rev-list $commit --not --all' '
+	git rev-list $commit --not --all >/dev/null
+'
+
+test_perf 'rev-list --objects $commit --not --all' '
+	git rev-list --objects $commit --not --all >/dev/null
+'
+
 test_done