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Re: [Xen-devel] [PATCH] Add DOM0_GETDOMAININFOLIST op for bulkretrieval

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Subject: Re: [Xen-devel] [PATCH] Add DOM0_GETDOMAININFOLIST op for bulkretrieval of domain info
From: Josh Triplett <josht@xxxxxxxxxx>
Date: Mon, 27 Jun 2005 11:33:59 -0700
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On Sat, 2005-06-25 at 10:17 +0100, Keir Fraser wrote:
> On 25 Jun 2005, at 02:41, Ian Pratt wrote:
> >> Using a small test program, on a system with 97 domains with
> >> non-contiguous domain IDs, I found that with this hypercall I
> >> could retrieve the full array of info structures 12840 times
> >> per second, an improvement from 2380 times per second with
> >
> > Can't you just reuse the existing xc_getdomain_info function and change
> > the hypercall depending on the number of domains being requested?
> Why not just add nr_doms argument to existing GETDOMAININFO op?
> Maybe make nr_doms==0 same as nr_doms==1 for backward source 
> compatibility.

DOM0_GETDOMAININFO only includes one dom0_getdomaininfo_t structure, not
a pointer to an array of such structures (and the length of that array),
so the operation would have no place to store the data.

- Josh Triplett

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