Re: [Xen-devel] vcpu_pause

["Ky Srinivasan" <ksrinivasan@xxxxxxxxxx>]

Kier,

Sorry for not being precise in my earlier email. Within an arbitrary domain, I 
was wondering how we were preventing potential deadlocks between vcpus that 
were attempting to pause each other; perhaps a higher level serialization lock 
could solve this problem. I was looking at using vcpu_pause to get a stable 
state for a vcpu in a domu context. Is this not a sanctioned usage of 
vcpu_pause.


K. Y
>>> On Sun, Mar 4, 2007 at  6:56 AM, in message
<C2106469.337F%Keir.Fraser@xxxxxxxxxxxx>, Keir Fraser
<Keir.Fraser@xxxxxxxxxxxx> wrote: 
> Synchronous vcpu_pause() and domain_pause() are only used on paths
> executable in dom0 context. Hence there is no loop in the graph of
> domain- X- can- pause- domain- Y, and we'll need to maintain that asymmetry 
> when
> we disaggregate dom0. For now, a BUG_ON(current- >domain != dom0) in
> vcpu_sleep_sync() would probably make things clearer.
> 
>  --  Keir
> 
> On 2/3/07 23:26, "Ky Srinivasan" <ksrinivasan@xxxxxxxxxx> wrote:
> 
>> What are the expected entry conditions to call vcpu_pause. How do we 
> guarantee
>> two vcpus don't deadlock by calling pause on each other.
>> 
>> Regards,
>> 
>> K. Y
>> 
>> 
>> 
>> _______________________________________________
>> Xen- devel mailing list
>> Xen- devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen- devel


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