Re: [Xen-devel] [PATCH 08 of 10 [RFC]] xl: Introduce First Fit memory-wise placement of guests on nodes

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 03/05/12 02:03, Dario Faggioli wrote:
> Actually, thinking more about this, I'm not even sure I can do what I
> stated above. In fact, I don't think I can assume the number of CPUs
> each node is made up of to be known, without actually checking it for
> the specific node(s) I want to try using. What if some CPUs are off-line
> and stuff like that?
Hmm, yeah, off-line cpus are certainly going to be an issue.  If each 
node has an equal number of cores, we should at least be able to find a 
*minimum* number of nodes, and then increase it from there; then in the 
common case (where there are no offline cpus), we'll only have a single 
pass.
But I think the priority right now is getting something useable for the 
4.2 release; so I think getting to a reasonable functionality quickly 
(i.e., with a minimum amount of effort from you) makes sense.  If that 
means leaving it as is for the moment, that's fine.  This won't be a hot 
path, so a little bit of inefficiency should be acceptable.  We can 
always come back and revisit it later.
 -George

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