limit app slice to less than all ram as well

machines/laptop.nix

@@ -10,6 +10,7 @@
     name = "DanixLaptop";
     eth = "enp0s31f6";
     wlan = "wlp5s0";
+    cores = 4;
   };
   profiles.base.enable = true;
   profiles.base.plus = true;

profiles/base/default.nix

@@ -23,6 +23,10 @@ in
     name = lib.mkOption {
       type = lib.types.str;
     };
+    cores = lib.mkOption {
+      type = lib.types.ints.positive;
+      default = 1;
+    };
     systemd = lib.mkOption {
       type = lib.types.bool;
       default = true;

profiles/xsession/default.nix

@@ -4,7 +4,7 @@ let
   cfg = config.profiles.xsession;
   non-nixos = config.profiles.non-nixos;
   mkGL = program: "${lib.strings.optionalString non-nixos.enable "${pkgs.nixgl.auto.nixGLDefault}/bin/nixGL "}${program}";
-  execScope = program: "exec bash -c \"systemd-run --user --scope --unit='app-i3-exec-$RANDOM' -p CollectMode=inactive-or-failed -p MemoryHigh=92% -p MemoryMax=98% \"${program}\"\"";
+  execScope = program: "exec bash -c \"systemd-run --user --scope --unit='app-i3-exec-$RANDOM' -p CollectMode=inactive-or-failed -p MemoryHigh=85% -p MemoryMax=92% -p MemorySwapMax=5G -p MemoryAccounting=true \"${program}\"\"";
 in
 {
   imports = [ ./dunstrc.nix ./terminal.nix ./polybar.nix ];
@@ -17,6 +17,14 @@ in
   config = lib.mkIf cfg.enable {
     profiles.gui.enable = true;
 
+    systemd.user.slices.app.Slice = {
+      MemoryHigh="90%";
+      MemoryMax="94%";
+      MemorySwapMax="8G";
+      CPUQuota="${toString ((config.machine.cores - 1)*100)}%";
+      MemoryAccounting = true;
+    };
+
     home.keyboard = {
       layout = "no";
       variant = "nodeadkeys";

scripts/dmenu_run_systemd

@@ -115,8 +115,9 @@ declare -ga runargs=(
      --slice="app.slice"             # run as part of `app.slice`
      --unit="${prefix}${name}-${rand}"
 
-     -p MemoryHigh=92%
-     -p MemoryMax=98%
+     -p MemoryHigh=85%
+     -p MemoryMax=92%
+     -p MemorySwapMax=5G
                                      # unit name
      --description="dmenu selection ${selection[*]@Q}"
 )