From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bei Guan <gbtju85@gmail.com>
Subject: How does the Xen kernel change the vcpu number of a
	domain?
Date: Fri, 13 Jun 2014 15:19:08 +0800
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Hi All,

I try to figure out that how the command "xl vcpu-set" works. I find out
that the command "xl vcpu-set" calls the method
libxl__set_vcpuonline_xenstore() to set the state of the vcpu in the
Xenstore path /local/domain_id/cpu/vcpu_id/availability. The value of the
key "availability" is set to "online" while the the vcpu number will
increase. When the key is set to "offline" the vcpu number will decrease.

What I want to know is how does the vcpu number increase/decrease according
to the vcpu state in the Xenstore?  How can I find the method that really
does the work?

Any reply is appreciated. Thank you all very much.

-- 
Best Regards,
Bei Guan

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<div dir=3D"ltr"><div>Hi All,</div><div><br></div><div>I try to figure out =
that how the command &quot;xl vcpu-set&quot; works. I find out that the com=
mand &quot;xl vcpu-set&quot; calls the method libxl__set_vcpuonline_xenstor=
e() to set the state of the vcpu in the Xenstore path /local/domain_id/cpu/=
vcpu_id/availability. The value of the key &quot;availability&quot; is set =
to &quot;online&quot; while the the vcpu number will increase. When the key=
 is set to &quot;offline&quot; the vcpu number will decrease.</div>
<div><br></div><div>What I want to know is how does the vcpu number increas=
e/decrease according to the vcpu state in the Xenstore? =C2=A0How can I fin=
d the method that really does the work?</div><div><br></div>Any reply is ap=
preciated. Thank you all very much.<br clear=3D"all">
<div><br></div>-- <br>Best Regards,<div>Bei Guan</div>
</div>

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