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db44eb1b5f
Historically QEMU/LXC guests have been placed in a cgroup layout
that is
$LOCATION-OF-LIBVIRTD/libvirt/{qemu,lxc}/$VMNAME
This is bad for a number of reasons
- The cgroup hierarchy gets very deep which seriously
impacts kernel performance due to cgroups scalability
limitations.
- It is hard to setup cgroup policies which apply across
services and virtual machines, since all VMs are underneath
the libvirtd service.
To address this the default cgroup location is changed to
be
/system/$VMNAME.{lxc,qemu}.libvirt
This puts virtual machines at the same level in the hierarchy
as system services, allowing consistent policy to be setup
across all of them.
This also honours the new resource partition location from the
XML configuration, for example
<resource>
<partition>/virtualmachines/production</partitions>
</resource>
will result in the VM being placed at
/virtualmachines/production/$VMNAME.{lxc,qemu}.libvirt
NB, with the exception of the default, /system, path which
is intended to always exist, libvirt will not attempt to
auto-create the partitions in the XML. It is the responsibility
of the admin/app to configure the partitions. Later libvirt
APIs will provide a way todo this.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
/*
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* qemu_cgroup.h: QEMU cgroup management
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*
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* Copyright (C) 2006-2007, 2009-2012 Red Hat, Inc.
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* Copyright (C) 2006 Daniel P. Berrange
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Author: Daniel P. Berrange <berrange@redhat.com>
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*/
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#ifndef __QEMU_CGROUP_H__
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# define __QEMU_CGROUP_H__
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# include "virusb.h"
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# include "vircgroup.h"
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# include "domain_conf.h"
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# include "qemu_conf.h"
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int qemuSetupDiskCgroup(virDomainObjPtr vm,
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virDomainDiskDefPtr disk);
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int qemuTeardownDiskCgroup(virDomainObjPtr vm,
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virDomainDiskDefPtr disk);
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int qemuSetupHostUsbDeviceCgroup(virUSBDevicePtr dev,
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const char *path,
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void *opaque);
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int qemuInitCgroup(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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bool startup);
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int qemuSetupCgroup(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virBitmapPtr nodemask);
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int qemuSetupCgroupVcpuBW(virCgroupPtr cgroup,
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unsigned long long period,
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long long quota);
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int qemuSetupCgroupVcpuPin(virCgroupPtr cgroup,
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virDomainVcpuPinDefPtr *vcpupin,
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int nvcpupin,
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int vcpuid);
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int qemuSetupCgroupEmulatorPin(virCgroupPtr cgroup, virBitmapPtr cpumask);
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int qemuSetupCgroupForVcpu(virDomainObjPtr vm);
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int qemuSetupCgroupForEmulator(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virBitmapPtr nodemask);
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int qemuRemoveCgroup(virDomainObjPtr vm);
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int qemuAddToCgroup(virDomainObjPtr vm);
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#endif /* __QEMU_CGROUP_H__ */
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