RE: [Xen-users] dom-U idle loop detection?

To:	"Roland Paterson-Jones" <roland@xxxxxxxxxxxx>, "xen-users" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-users] dom-U idle loop detection?
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Fri, 20 May 2005 11:07:40 +0100
Cc:	ian.pratt@xxxxxxxxxxxx
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Thread-topic:	[Xen-users] dom-U idle loop detection?

 

> Does Xen (well, dom-U xenified kernel) detect when a dom-U is 
> spinning in idle loop?

Yes -- the domU calls HYPERVISOR_yield.
 
> In other words is Xen scheduling able to tell whether a dom-U 
> is really busy?

Yes.

> I thought it might be useful to have a low-priority 
> 'background' dom-U that scavenged CPU-time when the other 
> dom-U's were idle.

You can achieve something akin to this just by setting the scheduler
weight parameters accordingly.

Ian

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RE: [Xen-users] dom-U idle loop detection?