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[Xen-devel] Re: Accounting in Credit Scheduler
- To: ncmike@xxxxxxxxxx
- From: rahul gundecha <rahoolgundecha@xxxxxxxxxxx>
- Date: Mon, 9 Apr 2007 15:40:53 +0100 (BST)
- Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 09 Apr 2007 07:39:52 -0700
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- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
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
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