Re: [Xen-devel] question about the poll_timer

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> Thank you for your reply
> I read to the function do_pci_op() you told me,but I am not familiar
> with the pci facility
> I guess the poll_timer gives a interval for pci probing before time out
> or something
> could you tell me more about pci and poll_timer
>
> Thank you in advance
>
> Atsushi SAKAI åé:

ISTR that the poll_timer is used to "Don't schedule me until an event comes 
in, or if the event hasn't arrived within this timeout"

It's a bit like the poll() system call in this respect.

HTH,
Cheers,
Mark

> >
> > Have you ever seen the do_pci_op() of
> > linux-2.6-sparse/drivers/xen/pcifront/pci_op.c?
> >
> > Thanks
> > Atsushi SAKAI
> >
> > tgh <tianguanhua@xxxxxxxxxx> wrote:
> >> hi
> >>  I try to understand the scheduler part code of xen,and I am confused
> >> about the poll_timer
> >> could you help me by telling me about the meaning and function of
> >> poll_timer
> >>
> >>
> >> struct vcpu {
> >>  ....
> >> struct timer     poll_timer;    /* timeout for SCHEDOP_poll */
> >> ....
> >> }
> >>
> >> Thanks in advance
> >>
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> >
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-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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