Adding linux 'perf' tool.

svn path=/nixpkgs/trunk/; revision=31319

pkgs/os-specific/linux/kernel/perf.nix

@@ -0,0 +1,21 @@
+{ stdenv, kernel, elfutils }:
+
+stdenv.mkDerivation {
+  name = "perf-linux-${kernel.version}";
+
+  inherit (kernel) src;
+
+  preConfigure = ''
+    cd tools/perf
+    export makeFlags="DESTDIR=$out"
+  '';
+
+  buildInputs = [ elfutils ];
+
+  meta = {
+    homepage = https://perf.wiki.kernel.org/;
+    description = "Linux tools to profile with performance counters";
+    maintainers = with stdenv.lib.maintainers; [viric];
+    platforms = with stdenv.lib.platforms; linux;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -5821,6 +5821,8 @@ let
       stdenv = overrideGCC stdenv gcc34;
     };
 
+    perf = callPackage ../os-specific/linux/kernel/perf.nix { };
+
     # State Nix
     snix = callPackage ../tools/package-management/snix {