[Xen-devel] Re: Accounting in Credit Scheduler

[rahul gundecha <rahoolgundecha@xxxxxxxxxxx>]

thanks alot Mike for kind reply.

One more curiousity is how often a timer routine is called & how often scheduling code?  It may be configurable interval as well, but then whats default value.
I guess timer is called more frequently & call to scheduling routine is made less frquently and is called from timer itself.

Can I get pointer to some reference where I will get to know how exactly this mechanism works. May be digging through code will be expensive option so I want to avoid it for a moment.

thanks,
-rahul

"Mike D. Day" <ncmike@xxxxxxxxxx> wrote:
>  On 09/04/07 12:03 +0100, rahul gundecha wrote:
> >
> >   Hi..
> >   I was going through wiki page of Credit Scheduler which says -
> >   " The scheduling decision is the common path of the scheduler and is
> >   therefore designed
>  to be light weight and efficient. No accounting
> >   takes place in this code path. "
> >   So  where does the accounting process takes place. exctaly by which
> >   way accounting for CPU, different IO device usage is done. With the
> >   complex architecture of Xen, how does this accounting process is
> >   carried out?
>
> The credit scheduler sets up a timer when it is initialized. It does
> process accounting during the timer service routine.
>
> The decision to schedule the next vcpu is done on a different code
> path, and is optimized to be as fast as possible.
>
> Mike
>
> -- 
> Mike D. Day
> IBM LTC
> Cell: 919 412-3900
> Sametime: ncmike@xxxxxxxxxx AIM: ncmikeday  Yahoo: ultra.runner
> PGP key: http://www.ncultra.org/ncmike/pubkey.asc

-Rahooooooooooooooool...

exceptions are most common things to happen.....

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