Merge pull request #238459 from SuperSamus/vm.max_map_count

nixos/modules/config/malloc.nix

···
   };
 
   config = mkIf (cfg.provider != "libc") {
-    boot.kernel.sysctl."vm.max_map_count" = mkIf (cfg.provider == "graphene-hardened") (mkDefault 1048576);
     environment.etc."ld-nix.so.preload".text = ''
       ${providerLibPath}
     '';

nixos/modules/config/sysctl.nix

···
     # Disable YAMA by default to allow easy debugging.
     boot.kernel.sysctl."kernel.yama.ptrace_scope" = mkDefault 0;
 
+    # Improve compatibility with applications that allocate
+    # a lot of memory, like modern games
+    boot.kernel.sysctl."vm.max_map_count" = mkDefault 1048576;
   };
 }

nixos/modules/virtualisation/lxd.nix

···
       "fs.inotify.max_queued_events" = 1048576;
       "fs.inotify.max_user_instances" = 1048576;
       "fs.inotify.max_user_watches" = 1048576;
-      "vm.max_map_count" = 262144;
+      "vm.max_map_count" = 262144; # TODO: Default vm.max_map_count has been increased system-wide
       "kernel.dmesg_restrict" = 1;
       "net.ipv4.neigh.default.gc_thresh3" = 8192;
       "net.ipv6.neigh.default.gc_thresh3" = 8192;

pkgs/applications/networking/browsers/firefox/common.nix

···
     export MOZILLA_OFFICIAL=1
   '' + lib.optionalString stdenv.hostPlatform.isMusl ''
     # linking firefox hits the vm.max_map_count kernel limit with the default musl allocator
+    # TODO: Default vm.max_map_count has been increased, retest without this
     export LD_PRELOAD=${mimalloc}/lib/libmimalloc.so
   '';