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

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
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date:	Fri, 21 Apr 2006 00:12:13 -0700
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index:	AcZlDyvAYETqRCJhRdq7CiADFzK9RQAA13nw
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
>again.
>>
>> 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.

Thanks,
Kevin

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

WARNING - OLD ARCHIVES

xen-devel

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