From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH] Activate Virtualization On Demand
Date: Wed, 18 Mar 2009 08:43:46 +0200
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Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>
To: Alexander Graf <agraf@suse.de>
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Alexander Graf wrote:
>>
>> Please make sure cpu hotplug/hotunplug (and this suspend/resume) 
>> still work.
>
> Make sure as in test?

I use this:

#!/usr/bin/python

import commands, time, random

processors = int(commands.getoutput('getconf _NPROCESSORS_CONF'))

def fname(cpu):
    return '/sys/devices/system/cpu/cpu%s/online' % (cpu,)

def get_state(cpu):
    return int(file(fname(cpu)).read())

def set_state(cpu, state):
        file(fname(cpu), 'w').write(str(state))

try:
    while True:
        cpu = random.randint(1, processors - 1)
        state = 1 - get_state(cpu)
        set_state(cpu, state)
        time.sleep(1)
except KeyboardInterrupt:
    for cpu in range(1, processors):
        if not get_state(cpu):
            set_state(cpu, 1)


-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.