Re: How to Stop scheduler

[George Dunlap <george.dunlap@eu.citrix.com>]

If you call vcpu_pause(), it atomically increments a counter in the vcpu 
struct.  While that counter is non-zero, the vcpu *will not* be 
scheduled, interrupts or no.  Interrupts will be delivered when it's 
scheduled again.

 -George

Pankaj Parakh wrote:
>  If I pause a vcpu/domain using those functions, say if a domain's I/O
> request over then its interrupt will raise and it can restart its
> scheduling rite..?? How this interrupts are/ can be queued so that
> when the vcpu is in pause state, it should nat change its state and
> when it come back to wait state, those interrupt will not be lost..
>
> On Tue, Nov 3, 2009 at 5:18 PM, George Dunlap
> <George.Dunlap@eu.citrix.com> wrote:
>   
>> Do you mean that you want to stop one specific vcpu / domain from
>> being scheduled?
>>
>> If so, you're looking for the following functions:
>> vcpu_pause(), vcpu_unpause()
>> domain_pause(), domain_unpause().
>>
>> They're defined in xen/common/domain.c.
>>
>>  -George
>>
>>
>> On Mon, Nov 2, 2009 at 9:02 PM, Pankaj Parakh <me.pankajparakh@gmail.com> wrote:
>>     
>>> Hi All,
>>>
>>> I am working on a project wherein I wanted to stop the scheduling
>>> activity in hypervisor through 'generic' part of scheduler, I have lil
>>> confusion as to what all things I need to mask/stop for disabling
>>> hypervisor to schedule any vcpu untill I want.
>>>
>>> Issues which I can think are about I/O waits or Zombie VCPUs. But how
>>> to tackle them... I dont know..
>>>
>>> I wanted to know what all responsibility the generic scheduler holds
>>> in hypervisor,
>>>
>>> Any type of info or pointer can be useful.
>>>
>>> Thanks
>>> Pankaj Parakh
>>>
>>> _______________________________________________
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>>> Xen-devel@lists.xensource.com
>>> http://lists.xensource.com/xen-devel
>>>
>>>       
>
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