[Xen-devel] Re: Accounting in Credit Scheduler

["Mike D. Day" <ncmike@xxxxxxxxxx>]

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
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