Re: [Xen-devel] ring buffer overflow

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2011-10-07 at 17:23 +0100, David Xu wrote:
> Hi,
> 
> This time I want to call it in the user-space. I wrote a user-level
> application and call the xc_sched_credit_domain_set( int
>  xc_handle, uint32_t domid, struct xen_domctl_sched_credit *sdom) in
> it. But I don't know how to pass the xc_handle parameter in this
> function. Thanks.

Tim already answered this. But why do you persist in top posting? You've
been asked not to _repeatedly_.

Please re-read http://wiki.xen.org/xenwiki/AskingXenDevelQuestions. In
particular the etiquette section.

Perhaps I should start ignoring top posted emails. :-/

Ian.

> 
> Regards,
> Cong
> 
> 2011/10/7 Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>:
> > Stop top posting, I've asked you this before.
> >
> > On Fri, 2011-10-07 at 16:23 +0100, David Xu wrote:
> >> Hi,
> >>
> >> I want to use the libxc function xc_sched_credit_domain_set( int
> >> xc_handle, uint32_t domid, struct xen_domctl_sched_credit *sdom) in a
> >> user-level application. But I don't know how to set the value of
> >> xc_handle. Is there somebody familiar with it? Thanks.
> >
> > You can't use xc_* functions in the kernel, they are userspace. You
> > could in theory look at the implementation of xc_sched_credit_domain_set
> > to find out what that hypercall is and make the underlying hypercall
> > instead, But:
> >
> > The hypercall in question here is a domctl which are not available /
> > allowed from kernel space (for policy and semantic reasons rather than
> > technological ones).
> >
> > As I explained elsewhere I don't think the architecture you have in mind
> > is correct. I think you should look at exporting the necessary
> > statistics from the kernel to userspace and have a daemon implement the
> > logic and mechanisms for changing the scheduling parameters as required.
> >
> > Ian.
> >
> >
> >



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