Add perf stage

garlic/stages/perf.nix

@@ -0,0 +1,30 @@
+{
+  stdenv
+, perf
+, garlicTools
+}:
+
+{
+  nextStage
+, perfOptions
+}:
+
+with garlicTools;
+
+let
+  program = stageProgram nextStage;
+in
+  stdenv.mkDerivation {
+    name = "perf";
+    phases = [ "installPhase" ];
+    preferLocalBuild = true;
+    dontPatchShebangs = true;
+    installPhase = ''
+      cat > $out <<EOF
+      #!/bin/sh
+      
+      exec ${perf}/bin/perf ${perfOptions} ${program}
+      EOF
+      chmod +x $out
+    '';
+  }

overlay.nix

@@ -244,6 +244,7 @@ let
         exec       = callPackage ./garlic/stages/exec.nix { };
         extrae     = callPackage ./garlic/stages/extrae.nix { };
         valgrind   = callPackage ./garlic/stages/valgrind.nix { };
+        perf       = callPackage ./garlic/stages/perf.nix { };
         isolate    = callPackage ./garlic/stages/isolate { };
         runexp     = callPackage ./garlic/stages/runexp { };
         trebuchet  = callPackage ./garlic/stages/trebuchet.nix { };