Re: [Kimchi-devel] [PATCH v6] Parts to allow Kimchi to configure the cpu topology.

Signed-off-by: Christy Perez <christy(a)linux.vnet.ibm.com&gt; --- docs/API.md | 24 ++++++++ src/kimchi/control/cpuinfo.py | 37 ++++++++++++ src/kimchi/control/host.py | 2 + src/kimchi/i18n.py | 5 ++ src/kimchi/model/cpuinfo.py | 128 ++++++++++++++++++++++++++++++++++++++++++ src/kimchi/model/templates.py | 10 ++-- 6 files changed, 202 insertions(+), 4 deletions(-) create mode 100644 src/kimchi/control/cpuinfo.py create mode 100644 src/kimchi/model/cpuinfo.py diff --git a/docs/API.md b/docs/API.md index 6c36bb1..d51e763 100644 --- a/docs/API.md +++ b/docs/API.md @@ -896,6 +896,30 @@ Contains the host sample data. *No actions defined* +### Resource: HostStats + +**URI:** /host/cpuinfo + +The cores and sockets of a hosts's CPU. Useful when sizing VMs to take +advantages of the perforamance benefits of SMT (Power) or Hyper-Threading (Intel). + +**Methods:** + +* **GET**: Retreives the sockets, cores, and threads values. + * threading_enabled: Whether CPU topology is supported on this system. + * sockets: The number of total sockets on a system. + * cores: The total number of cores per socket. + * threads_per_core: The threads per core. + +**Actions (PUT):** + +*No actions defined* + +**Actions (POST):** + +*No actions defined* + + ### Resource: HostStatsHistory **URI:** /host/stats/history diff --git a/src/kimchi/control/cpuinfo.py b/src/kimchi/control/cpuinfo.py new file mode 100644 index 0000000..415dd3d --- /dev/null +++ b/src/kimchi/control/cpuinfo.py @@ -0,0 +1,37 @@ +# +# Project Kimchi +# +# Copyright IBM, Corp. 2014 +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + + +from kimchi.control.base import Resource + + +class CPUInfo(Resource): + def __init__(self, model): + super(CPUInfo, self).__init__(model) + self.admin_methods = ['GET'] + self.role_key = 'host' + self.uri_fmt = "/host/cpuinfo" + + @property + def data(self): + return {'threading_enabled': self.info['guest_threads_enabled'], + 'sockets': self.info['sockets'], + 'cores': self.info['cores_available'], + 'threads_per_core': self.info['threads_per_core'] + } diff --git a/src/kimchi/control/host.py b/src/kimchi/control/host.py index 4362da7..9f73653 100644 --- a/src/kimchi/control/host.py +++ b/src/kimchi/control/host.py @@ -17,6 +17,7 @@ # License along with this library; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +from kimchi.control.cpuinfo import CPUInfo from kimchi.control.base import Collection, Resource, SimpleCollection from kimchi.control.utils import UrlSubNode from kimchi.exception import NotFoundError @@ -39,6 +40,7 @@ def __init__(self, model, id=None): self.users = Users(self.model) self.groups = Groups(self.model) self.swupdate = self.generate_action_handler_task('swupdate') + self.cpuinfo = CPUInfo(self.model) @property def data(self): diff --git a/src/kimchi/i18n.py b/src/kimchi/i18n.py index 8f6b67e..a836401 100644 --- a/src/kimchi/i18n.py +++ b/src/kimchi/i18n.py @@ -318,4 +318,9 @@ "KCHSNAP0006E": _("Unable to delete snapshot '%(name)s' on virtual machine '%(vm)s'. Details: %(err)s"), "KCHSNAP0008E": _("Unable to retrieve current snapshot on virtual machine '%(vm)s'. Details: %(err)s"), "KCHSNAP0009E": _("Unable to revert virtual machine '%(vm)s' to snapshot '%(name)s'. Details: %(err)s"), + + "KCHCPUINF0001E": _("The number of vCPUs is too large for this system."), + "KCHCPUINF0002E": _("Invalid vCPU/topology combination."), + "KCHCPUINF0003E": _("This host (or current configuration) does not allow CPU topology."), + } diff --git a/src/kimchi/model/cpuinfo.py b/src/kimchi/model/cpuinfo.py new file mode 100644 index 0000000..9042f7e --- /dev/null +++ b/src/kimchi/model/cpuinfo.py @@ -0,0 +1,128 @@ +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + +import platform + +from xml.etree import ElementTree as ET + +from kimchi.exception import InvalidParameter, InvalidOperation +from kimchi.exception import OperationFailed +from kimchi.utils import kimchi_log, run_command + +ARCH = 'power' if platform.machine().startswith('ppc') else 'x86' +LEGACY_CPU_MAX = 4 + + +class CPUInfoModel(object): + """ + Get information about a CPU for hyperthreading (on x86) + or SMT (on POWER) for logic when creating templates and VMs. + """ + + def __init__(self, **kargs): + self.conn = kargs['conn'] + + """ + Since there are so many similar-seeming variables: + - guest_threads_enabled = Can a user specify topology? + - sockets = total number of sockets in the system. While nothing + uses this value, it's part of topology so we'll track it. + - cores_present = total number of cores in the system + Note: Cores is often synonymous with CPUs. + - cores_available = cores online (in case some were offlined) + - cores_per_socket = max cores value for topology + - threads_per_core = max threads value for topology + """ + + self.conn = kargs['conn'] + libvirt_topology = None + try: + connect = self.conn.get() + except Exception as e: + raise OperationFailed("Unable to get qemu connection: %s" + % e.message) + try: + xml = connect.getCapabilities() + capabilities = ET.fromstring(xml) + libvirt_topology = capabilities.find('host').find('cpu').\ + find('topology') + if libvirt_topology is None: + kimchi_log.info("cpu_info topology not supported.") + self.guest_threads_enabled = False + self.sockets = 0 + self.cores_present = 0 + self.cores_available = 0 + self.cores_per_socket = 0 + self.threads_per_core = 0 + self.max_threads = 0 + return

+ except Exception as e: + raise OperationFailed("Unable to get CPU topology capabilities: %s" + % e.message)

+ + if ARCH == 'power': + # IBM PowerPC + self.guest_threads_enabled = True + out, error, rc = run_command(['ppc64_cpu', '--smt']) + if rc or 'on' in out: + # SMT has to be disabled for guest to use threads as CPUs. + # rc is always zero, whether SMT is off or on. + self.guest_threads_enabled = False + out, error, rc = run_command(['ppc64_cpu', '--cores-present']) + if not rc: + self.cores_present = int(out.split()[-1]) + out, error, rc = run_command(['ppc64_cpu', '--cores-on']) + if not rc: + self.cores_available = int(out.split()[-1]) + out, error, rc = run_command(['ppc64_cpu', '--threads-per-core']) + if not rc: + self.threads_per_core = int(out.split()[-1]) + self.sockets = self.cores_present/self.threads_per_core + self.cores_per_socket = self.cores_present/self.sockets + else: + # Intel or AMD + self.guest_threads_enabled = True + self.sockets = int(libvirt_topology.get('sockets')) + self.cores_per_socket = int(libvirt_topology.get('cores')) + self.cores_present = self.cores_per_socket * self.sockets + self.cores_available = self.cores_present + self.threads_per_core = int(libvirt_topology.get('threads')) + + def lookup(self, ident): + return { + 'guest_threads_enabled': self.guest_threads_enabled, + 'sockets': self.sockets, + 'cores_per_socket': self.cores_per_socket, + 'cores_present': self.cores_present, + 'cores_available': self.cores_available, + 'threads_per_core': self.threads_per_core, + } + + def check_topology(self, vcpus, topology): + """ + param vcpus: should be an integer + param iso_path: the path of the guest ISO + param topology: {'sockets': x, 'cores': x, 'threads': x} + """ + sockets = topology['sockets'] + cores = topology['cores'] + threads = topology['threads'] + + if not self.guest_threads_enabled: + raise InvalidOperation("KCHCPUINF0003E") + if vcpus != sockets * cores * threads: + raise InvalidParameter("KCHCPUINF0002E") + if vcpus > self.cores_available * self.threads_per_core: + raise InvalidParameter("KCHCPUINF0001E") + if threads > self.threads_per_core: + raise InvalidParameter("KCHCPUINF0002E") diff --git a/src/kimchi/model/templates.py b/src/kimchi/model/templates.py index 6e1a571..36dff9f 100644 --- a/src/kimchi/model/templates.py +++ b/src/kimchi/model/templates.py @@ -25,6 +25,7 @@ from kimchi.exception import InvalidOperation, InvalidParameter from kimchi.exception import NotFoundError, OperationFailed from kimchi.kvmusertests import UserTests +from kimchi.model.cpuinfo import CPUInfoModel from kimchi.utils import pool_name_from_uri from kimchi.utils import probe_file_permission_as_user from kimchi.vmtemplate import VMTemplate @@ -57,11 +58,12 @@ def create(self, params): sockets = topology['sockets'] cores = topology['cores'] threads = topology['threads'] - vcpus = params.get('cpus') - if vcpus is None: + if params.get('cpus') is None: params['cpus'] = sockets * cores * threads - elif vcpus != sockets * cores * threads: - raise InvalidParameter("KCHTMPL0025E") + # check_topoology will raise the appropriate + # exception if a topology is invalid. + CPUInfoModel(conn=self.conn).\ + check_topology(params['cpus'], topology) else: params['cpu_info'] = dict()