modules/common/kernel.nix


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{ lib, ... }:
with lib;
{
  boot.kernel.sysctl = {
    "fs.file-max" = pow 2 17;
    "fs.inotify.max_user_watches" = pow 2 19;
    "fs.suid_dumpable" = 0;
    "kernel.core_uses_pid" = 1;
    "kernel.exec-shield" = 1;
    "kernel.kptr_restrict" = 1;
    "kernel.maps_protect" = 1;
    "kernel.msgmax" = pow 2 16;
    "kernel.msgmnb" = pow 2 16;
    "kernel.pid_max" = pow 2 16;
    "kernel.randomize_va_space" = 2;
    "kernel.shmall" = pow 2 28;
    "kernel.shmmax" = pow 2 28;
    "kernel.sysrq" = 0;
    "vm.dirty_background_bytes" = pow 2 22;
    "vm.dirty_background_ratio" = 5;
    "vm.dirty_bytes" = pow 2 22;
    "vm.dirty_ratio" = 30;
    "vm.min_free_kbytes" = pow 2 16;
    "vm.mmap_min_addr" = pow 2 12;
    "vm.overcommit_memory" = mkDefault 0;
    "vm.overcommit_ratio" = mkDefault 50;
    "vm.vfs_cache_pressure" = 50;
  };

  # https://docs.kernel.org/admin-guide/mm/ksm.html
  hardware.ksm.enable = true;
}