Re: [Xen-devel] Re: Fine-grained proxy resource charging

[Rob Gardner <rob.gardner@xxxxxx>]

Andi Kleen wrote:

> > It's not a bad idea just because it's a hard problem.
> >    
> Hard, likely slow (x86 has no really cheap
> way to do microstate accounting), likely a lot of work,
> and you have to fix up every driver in existence for it.
> Not even talking about the VM which would need a kind
> of redesign for it. For example pdflushd when flushing a dirty page has
> no idea who dirtied it originally and there is simply no 
> space in struct page to track such stuff.
>  
Hey, we don't need an exact solution. Right now there is no accounting 
at all for I/O overhead, so even a crude solution would be a giant step 
in the right direction.
Rob



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