linux-kernel - Re: nonboot cpu on SMP suspend

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Date:	Thu, 19 Mar 2009 15:04:29 +0800
From:	chen gong <gong.chen@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Li Yang <leoli@...escale.com>, linux-kernel@...r.kernel.org
Subject: Re: nonboot cpu on SMP suspend

Rafael J. Wysocki 写道:
> On Wednesday 18 March 2009, Li Yang wrote:
>> Hi all,
>>
>> I'm curious why we need to un-plug all the nonboot cpus before suspend
>> and start them all over again after the suspend(ACPI sleep)?  I mean
>> if we can bring the booting cpu back to the exact state as before
>> suspend, why can't we just do the same for non-booting cpus?  And that
>> will be much faster.  Any thought?  Thanks.
> 
> Because we need to enter the BIOS with one CPU on-line only.
> 
You mean only one CPU can be supported by BIOS when suspend/resume ?
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