diff --git a/modules/dgn-console.nix b/modules/dgn-console.nix
index 20f7eca..f3c8fea 100644
--- a/modules/dgn-console.nix
+++ b/modules/dgn-console.nix
@@ -76,30 +76,32 @@ in
         mtr
         tcpdump
       ])
-      ++ lib.optional
-        (config.services.postgresql.enable && config.services.postgresql.package != cfg.pg-upgrade-to)
-        (
-          pkgs.writeScriptBin "upgrade-pg-cluster" ''
-            set -eux
-            # XXX it's perhaps advisable to stop all services that depend on postgresql
-            systemctl stop postgresql
+      ++ [ config.boot.kernelPackages.perf ]
+      ++
+        lib.optional
+          (config.services.postgresql.enable && config.services.postgresql.package != cfg.pg-upgrade-to)
+          (
+            pkgs.writeScriptBin "upgrade-pg-cluster" ''
+              set -eux
+              # XXX it's perhaps advisable to stop all services that depend on postgresql
+              systemctl stop postgresql
 
-            export NEWDATA="/var/lib/postgresql/${cfg.pg-upgrade-to.psqlSchema}"
+              export NEWDATA="/var/lib/postgresql/${cfg.pg-upgrade-to.psqlSchema}"
 
-            export NEWBIN="${cfg.pg-upgrade-to}/bin"
+              export NEWBIN="${cfg.pg-upgrade-to}/bin"
 
-            export OLDDATA="${config.services.postgresql.dataDir}"
-            export OLDBIN="${config.services.postgresql.package}/bin"
+              export OLDDATA="${config.services.postgresql.dataDir}"
+              export OLDBIN="${config.services.postgresql.package}/bin"
 
-            install -d -m 0700 -o postgres -g postgres "$NEWDATA"
-            cd "$NEWDATA"
-            sudo -u postgres $NEWBIN/initdb -D "$NEWDATA"
+              install -d -m 0700 -o postgres -g postgres "$NEWDATA"
+              cd "$NEWDATA"
+              sudo -u postgres $NEWBIN/initdb -D "$NEWDATA"
 
-            sudo -u postgres $NEWBIN/pg_upgrade \
-              --old-datadir "$OLDDATA" --new-datadir "$NEWDATA" \
-              --old-bindir $OLDBIN --new-bindir $NEWBIN \
-              "$@"
-          ''
-        );
+              sudo -u postgres $NEWBIN/pg_upgrade \
+                --old-datadir "$OLDDATA" --new-datadir "$NEWDATA" \
+                --old-bindir $OLDBIN --new-bindir $NEWBIN \
+                "$@"
+            ''
+          );
   };
 }