Add support for nanos6 with jemalloc

bsc/nanos6/git.nix

@@ -11,6 +11,8 @@
 , extrae
 , boost
 , autoreconfHook
+, enableJemalloc ? false
+, jemalloc ? null
 }:
 
 with stdenv.lib;
@@ -38,6 +40,9 @@ stdenv.mkDerivation rec {
     export NANOS6_GIT_BRANCH=${branch}
   '';
 
+  configureFlags = [] ++
+    optional enableJemalloc "--with-jemalloc=${jemalloc}";
+
   # The "bindnow" flags are incompatible with ifunc resolution mechanism. We
   # disable all by default, which includes bindnow.
   hardeningDisable = [ "all" ];

overlay.nix

@@ -116,6 +116,19 @@ let
     nanos6Latest = callPackage ./bsc/nanos6/default.nix { };
     nanos6Git = callPackage ./bsc/nanos6/git.nix { };
 
+    jemalloc = self.jemalloc.overrideAttrs (old:
+    {
+      # Custom nanos6 configure options
+      configureFlags = old.configureFlags ++ [
+        "--with-jemalloc-prefix=nanos6_je_"
+        "--enable-stats"
+      ];
+    });
+
+    nanos6Jemalloc = callPackage ./bsc/nanos6/git.nix {
+      enableJemalloc = true;
+    };
+
     babeltrace = callPackage ./bsc/babeltrace/default.nix { };
     babeltrace2 = callPackage ./bsc/babeltrace2/default.nix { };