Re: 2.6.13-rc3-mm1 (ckrm)

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

On Gwe, 2005-07-22 at 12:35 -0400, Mark Hahn wrote:
> I imagine you, like me, are currently sitting in the Xen talk,

Out by a few thousand miles ;)

> and I don't believe they are or will do anything so dumb as to throw away
> or lose information.  yes, in principle, the logic will need to be 

They don't have it in the first place. 

> somewhere, and I'm suggesting that the virtualization logic should
> be in VMM-only code so it has literally zero effect on host-native 
> processes.  *or* the host-native fast-path.

I don't see why you are concerned. If the CKRM=n path is zero impact
then its irrelevant to you. Its more expensive to do a lot of resource
management at the VMM level because the virtualisation engine doesn't
know anything but its getting indications someone wants to be
bigger/smaller.


> but to really do CKRM, you are going to want quite extensive interaction with
> the scheduler, VM page replacement policies, etc.  all incredibly
> performance-sensitive areas.

Bingo - and areas the virtualiser can't see into, at least not unless it
uses the same hooks CKRM uses

Alan

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