Re: [Xen-devel] ring buffer overflow

[David Xu <davidxu06@xxxxxxxxx>]

Sorry, I did not notice his email and I did not mean to. I will be
more careful next time.

Regards,
Cong

2011/10/7 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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