Re: [Xen-devel] Only CPU0 active after ACPI S3, xen 4.1.3

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.01.13 at 12:58, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> On 16/01/13 11:22, George Dunlap wrote:
>> Jan, the commit message isn't very informative -- can you point me to 

Which commit message?

>> a conversation describing the problem you're fixing wrt 
>> suspend/resume, and/or describe what you were trying to do?  Given the 
>> results, the whole thing about not disabling scheduling during suspend 
>> seems a bit suspect...
> 
> In particular, just on a fairly cursory bit of function call skimming, 
> it looks like:
> * This change means that cpupool.c:cpu_callback() won't call 
> cpupool_cpu_add() when resuming
> * cpupool_cpu_add() does a bunch of paperwork (which would be 
> unnecessary given the changes re suspend), but also calls 
> cpupool_assign_cpu_locked()
> * cpupool_assign_cpu_locked() calls schedule_cpu_switch()
> * schedule_cpu_switch() calls the scheduler's tick_resume()
> 
> So is it possible that on resume ticks are not being re-enabled, or 
> something like that?

I don't see a problem here - it's symmetric (nothing done on
suspend, and nothing done on resume).

Jan


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