2016-11-23 22:00, Maxime Coquelin:
> +You can use this qmp-vcpu-pin script to pin vCPUs:
> +
> + .. code-block:: python
> +
> + #!/usr/bin/python
> + # QEMU vCPU pinning tool
> + #
> + # Copyright (C) 2016 Red Hat Inc.
> + #
> + # Authors:
> + # Maxime Coquelin <maxime.coquelin at redhat.com>
> + #
> + # This work is licensed under the terms of the GNU GPL, version 2. See
> + # the COPYING file in the top-level directory
> + import argparse
> + import json
> + import os
> +
> + from subprocess import call
> + from qmp import QEMUMonitorProtocol
> +
> + pinned = []
> +
> + parser = argparse.ArgumentParser(description='Pin QEMU vCPUs to physical
> CPUs')
> + parser.add_argument('-s', '--server', type=str, required=True,
> + help='QMP server path or address:port')
> + parser.add_argument('cpu', type=int, nargs='+',
> + help='Physical CPUs IDs')
> + args = parser.parse_args()
> +
> + devnull = open(os.devnull, 'w')
> +
> + srv = QEMUMonitorProtocol(args.server)
> + srv.connect()
> +
> + for vcpu in srv.command('query-cpus'):
> + vcpuid = vcpu['CPU']
> + tid = vcpu['thread_id']
> + if tid in pinned:
> + print 'vCPU{}\'s tid {} already pinned, skipping'.format(vcpuid,
> tid)
> + continue
> +
> + cpuid = args.cpu[vcpuid % len(args.cpu)]
> + print 'Pin vCPU {} (tid {}) to physical CPU {}'.format(vcpuid, tid,
> cpuid)
> + try:
> + call(['taskset', '-pc', str(cpuid), str(tid)], stdout=devnull)
> + pinned.append(tid)
> + except OSError:
> + print 'Failed to pin vCPU{} to CPU{}'.format(vcpuid, cpuid)
>
No please do not introduce such useful script in a doc.
I think it must be a separate file in the DPDK repository or
in the QEMU repository.
