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xen-devel
[Xen-ia64-devel] Re: [Xen-devel] [PATCH] Fix auto-ballooning of dom0 for
On 22 May 2006, at 16:38, Keir Fraser wrote:
Unless, of course, the HVM domain has eaten up some of the slack in
the
mean-time, in which case dom0 frees up PV-guest-size minus
remaining-slack.
The auto-ballooning logic is shagged then. xend should keep track of
memory requirements (inc. max overheads) of every domain, then ensure
dom0 memory usage is no greater than total memory minus sum of all
other domains' memory requirements. How hard can that be? (Too hard
for original author I guess ;-) ).
Anyway, I'm going to back out the "4MB slack" hack. Auto-ballooning
can never be stable in its current form (consider a guest that
temporarily balloons down from 128MB to 64MB, then another (HVM) guest
starts, then it tries to balloon back to 128MB -- it'll fail, and the
HVM guest will lose any headroom it required).
Actually, since there is an argument for keeping it for live migration,
I'll keep it for the time being. But it does sound like auto-ballooning
needs some more thought.
I'll apply a suitable patch for ia64 shortly....
-- Keir
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