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Re: [Xen-devel] How to Stop scheduler

To: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] How to Stop scheduler
From: Pankaj Parakh <me.pankajparakh@xxxxxxxxx>
Date: Wed, 4 Nov 2009 11:08:02 +0530
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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So is that means there will be no interrupt loss, and also clock in
the paused domain will be in right and expected time.. ??

On Wed, Nov 4, 2009 at 12:41 AM, George Dunlap
<george.dunlap@xxxxxxxxxxxxx> wrote:
> 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@xxxxxxxxxxxxx> 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@xxxxxxxxx>
>>> 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
>>>> _______________________________________________
>>>> Xen-devel mailing list
>>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>>> http://lists.xensource.com/xen-devel

Pankaj Parakh

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