diff --git a/m/eudy/kernel/kernel.nix b/m/eudy/kernel/kernel.nix
index 3078fad..016b8cb 100644
--- a/m/eudy/kernel/kernel.nix
+++ b/m/eudy/kernel/kernel.nix
@@ -21,14 +21,14 @@ let
   #   configfile = if lockdep then ./configs/lockdep else ./configs/defconfig;
   #};
 
-  kernel = nixos-fcsv2;
+  kernel = nixos-fcsv3;
 
-  nixos-fcs-kernel = {gitCommit, lockStat ? false, preempt ? false}: pkgs.linuxPackagesFor (pkgs.buildLinux rec {
+  nixos-fcs-kernel = {gitCommit, lockStat ? false, preempt ? false, branch ? "fcs"}: pkgs.linuxPackagesFor (pkgs.buildLinux rec {
     version = "6.2.8";
     src = builtins.fetchGit {
       url = "git@bscpm03.bsc.es:ompss-kernel/linux.git";
       rev = gitCommit;
-      ref = "fcs";
+      ref = branch;
     };
     structuredExtraConfig = with lib.kernel; {
       # add general custom kernel options here
@@ -44,6 +44,17 @@ let
 
   nixos-fcsv1 = nixos-fcs-kernel {gitCommit = "bc11660676d3d68ce2459b9fb5d5e654e3f413be";};
   nixos-fcsv2 = nixos-fcs-kernel {gitCommit = "db0f2eca0cd57a58bf456d7d2c7d5d8fdb25dfb1";};
+  nixos-fcsv3 = nixos-fcs-kernel {gitCommit = "6c17394890704c3345ac1a521bb547164b36b154";};
+
+  # always use fcs_sched_setaffinity
+  #nixos-debug = nixos-fcs-kernel {gitCommit = "7d0bf285fca92badc8df3c9907a9ab30db4418aa";};
+  # remove need_check_cgroup
+  #nixos-debug = nixos-fcs-kernel {gitCommit = "4cc4efaab5e4a0bfa3089e935215b981c1922919";};
+  # merge again fcs_wake and fcs_wait
+  #nixos-debug = nixos-fcs-kernel {gitCommit = "40c6f72f4ae54b0b636b193ac0648fb5730c810d";};
+  # start from scratch, this is the working version with split fcs_wake and fcs_wait
+  nixos-debug = nixos-fcs-kernel {gitCommit = "c9a39d6a4ca83845b4e71fcc268fb0a76aff1bdf"; branch = "fcs-test"; };
+
   nixos-fcsv1-lockstat = nixos-fcs-kernel {
     gitCommit = "bc11660676d3d68ce2459b9fb5d5e654e3f413be";
     lockStat = true;
@@ -52,8 +63,12 @@ let
     gitCommit = "db0f2eca0cd57a58bf456d7d2c7d5d8fdb25dfb1";
     lockStat = true;
   };
-  nixos-fcsv2-lockstat-preempt = nixos-fcs-kernel {
-    gitCommit = "db0f2eca0cd57a58bf456d7d2c7d5d8fdb25dfb1";
+  nixos-fcsv3-lockstat = nixos-fcs-kernel {
+    gitCommit = "6c17394890704c3345ac1a521bb547164b36b154";
+    lockStat = true;
+  };
+  nixos-fcsv3-lockstat-preempt = nixos-fcs-kernel {
+    gitCommit = "6c17394890704c3345ac1a521bb547164b36b154";
     lockStat = true;
     preempt = true;
   };