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xen-devel
Re: [Xen-devel] [PATCH] enforce dom0 cpus and balloon out memory
* Mark Williamson <mark.williamson@xxxxxxxxxxxx> [2005-07-29 10:25]:
> > You could use vcpu-hotplug to drop the extra cpus from dom0 instead of
> > writing directly into sysfs. The only stopper to that approach is the
> > fact that dom0's self.channel is not initialized when xend starts and
> > subsequently doesn't send the control message. Channels are initialized
> > when a domain is built, but since dom0 is built by xen, the routine
> > which sets up channels isn't called for dom0. Haven't found a good place
> > for xend to initialized the channel for dom0 yet either.
>
> Hmmm. Is the channel never set up then? It'd certainly be nice if it were:
Correct. As mentioned above, this is only a problem for dom0 since the
xend contruct_image() code isn't called for dom0 as xen is the builder.
The fix is as simple as calling create_channel() from dom0's XendDomInfo
object. I've not determined the appropriate location to issue the call.
> then you can use "xm balloon" to set dom0's memory footprint, which is
> preferable to using the /proc interface directly.
Indeed. Same goes for using vcpu_hotplug() versus sysfs
--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253 T/L: 678-9253
ryanh@xxxxxxxxxx
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