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Remove the cgroups module

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Cgroups are handled by systemd now.  Systemd's cgroup support does not
do all the things that cgrulesengd does, but they're likely to
interact poorly with each other.
This commit is contained in:
Eelco Dolstra 2012-10-26 19:36:59 +02:00
parent 65eae4dd34
commit 390f5f7376
2 changed files with 0 additions and 147 deletions
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1
modules/module-list.nix
View File

@ -160,7 +160,6 @@
./services/security/frandom.nix ./services/security/frandom.nix
./services/security/tor.nix ./services/security/tor.nix
./services/security/torsocks.nix ./services/security/torsocks.nix
./services/system/cgroups.nix
./services/system/dbus.nix ./services/system/dbus.nix
./services/system/kerberos.nix ./services/system/kerberos.nix
./services/system/nscd.nix ./services/system/nscd.nix

146
modules/services/system/cgroups.nix
View File

@ -1,146 +0,0 @@
{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.cgroups;
cgconfigConf = pkgs.writeText "cgconfig.conf" cfg.groups;
cgrulesConf = pkgs.writeText "cgrules.conf" cfg.rules;
in
{
###### interface
options = {
services.cgroups.enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable support for control groups, a Linux kernel
feature for resource management. It allows you to assign
processes to groups that share certain resource limits (e.g.,
CPU or memory). The <command>cgrulesengd</command> daemon
automatically assigns processes to the right cgroup depending
on the rules defined in
<option>services.cgroups.rules</option>.
'';
};
services.cgroups.groups = mkOption {
type = types.string;
default =
''
mount {
cpu = /sys/fs/cgroup/cpu;
}
'';
example =
''
mount {
cpu = /sys/fs/cgroup/cpu;
cpuacct = /sys/fs/cgroup/cpuacct;
}
# Create a "www" cgroup with a lower share of the CPU (the
# default is 1024).
group www {
cpu {
cpu.shares = "500";
}
}
'';
description = ''
The contents of the <filename>cgconfig.conf</filename>
configuration file, which defines the cgroups.
'';
};
services.cgroups.rules = mkOption {
type = types.string;
default = "";
example =
''
# All processes executed by the "wwwrun" uid should be
# assigned to the "www" CPU cgroup.
wwwrun cpu www
'';
description = ''
The contents of the <filename>cgrules.conf</filename>
configuration file, which determines to which cgroups
processes should be assigned by the
<command>cgrulesengd</command> daemon.
'';
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.libcgroup ];
environment.etc =
[ { source = cgconfigConf;
target = "cgconfig.conf";
}
{ source = cgrulesConf;
target = "cgrules.conf";
}
];
# The daemon requires the userspace<->kernelspace netlink
# connector.
boot.kernelModules = [ "cn" ];
jobs.cgroups =
{ startOn = "startup";
description = "Control groups daemon";
path = [ pkgs.libcgroup pkgs.procps pkgs.utillinux ];
preStart =
''
if [ -d /sys/fs/cgroup ]; then
if ! mountpoint -q /sys/fs/cgroup; then
mount -t tmpfs -o mode=755 /dev/cgroup /sys/fs/cgroup
fi
fi
cgclear || true
# Mount the cgroup hierarchies. Note: we refer to the
# store path of cgconfig.conf here to ensure that the job
# gets reloaded if the configuration changes.
cgconfigparser -l ${cgconfigConf}
# Move existing processes to the right cgroup.
cgclassify --cancel-sticky $(ps --no-headers -eL o tid) || true
# Force a restart if the rules change:
# ${cgrulesConf}
'';
# Run the daemon that moves new processes to the right cgroup.
exec = "cgrulesengd";
daemonType = "fork";
postStop =
''
cgclear
'';
};
};
}