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Re: [Xen-devel] How to Stop scheduler

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.


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.


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.

Pankaj Parakh

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