Re: [Xen-devel] /proc/xen/xenbus supports watch?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 25 Sep 2005, at 12:02, Keir Fraser wrote:

> Yeah, I can live with this, although: What about multiple transactions 
> within the kernel? Do you plan to continue serialising them (e.g., on 
> a waitqueue)? An advantage of mux/demux would be that concurrent 
> kernel transactions could easily use the same mechanism. Your scheme 
> places restart mechanisms in user space, so they're out of reach for 
> kernel transactions.
Also, page-per-connection won't entirely avoid sharing of 
state/resource in xenstored. At some point we'll want to add per-domain 
access policy, and space/bandwidth quotas (to prevent DoS). All of 
those must be shared between the multiple connections of a domain -- so 
the separate connections aren't as independent as you might like.
 -- Keir


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