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RE: [Xen-devel] [PATCH]Check the values of MAX_VIRT_CPUS and NR_CPUSfor

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, "Atsushi SAKAI" <sakaia@xxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH]Check the values of MAX_VIRT_CPUS and NR_CPUSfor SMP
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Fri, 21 Apr 2006 15:11:00 +0800
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Thread-topic: [Xen-devel] [PATCH]Check the values of MAX_VIRT_CPUS and NR_CPUSfor SMP
>From: Keir Fraser
>Sent: 2006年4月21日 14:41
>On 21 Apr 2006, at 02:31, Atsushi SAKAI wrote:
>> But the logical limit of the IA64 Max CPU is larger than 64.
>> If someone change these values, some possibility make this error
>> To avoid this problem, I believe this check code should be exists.
>See how we solve this on x86 near the top of do_boot_cpu() in
>arch/x86/smpboot.c. Essentially we allocate extra idle domains on
>demand to give us enough idle vcpus for one per physical cpu.
>  -- Keir

Yes, that's the same story on ia64 where we also allocate idle 
vcpu at do_boot_cpu(). That's why I'm not sure the real cause 
for Atsushi's issue.


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