Keir,
Attached is a patch that makes the ballooning logic in xend aware of
pages that are on the page scrub list. This fixes the case where
crashing/restarting a domain can cause dom0 to balloon more than
necessary.
I changed the physinfo dictionary in Python to be in KiB, rather than
MiB, to avoid accumulating ugly rounding errors. I tried to avoid
changing units anywhere else.
The patch is against xen-unstable. It applies and works against
xen-3.0-testing also (in fact that's where I did most of my testing) but
I don't know if you want to apply it there. I changed the dom0_physinfo
in a non-backwards-compatible way. Looked nicer to me to group the
*_pages fields together, but that's probably not something you'd want to
do in 3.0.2... your call.
Thanks,
Charles
Signed-off-by: Charles Coffing <ccoffing@xxxxxxxxxx>
On Tue, Jun 20, 2006 at 1:20 AM, Keir Fraser
<Keir.Fraser@xxxxxxxxxxxx> wrote: 
> On 19 Jun 2006, at 23:15, Charles Coffing wrote:
>
>> Would it make sense to give this information to balloon.py, and
apply 
>> some heuristics? Perhaps xend should wait for the scrub list to go
to 
>> zero before trying to balloon. Or maybe it should consider that 
>> memory as free, and only try to balloon (needed - to_scrub).
>>
>> The most obvious way (to me) to get that information to xend is via
>> DOM0_PHYSINFO. That way, the number of free pages and the number of
>> pages to scrub can be gotten atomically.
>>
>> Thoughts?
>>
>> I volunteer to code and test this if there's some agreement on how
it 
>> should be done.
>
> Your approach sounds fine to me.
>
> -- Keir
>
>
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Attachment: xen-scrub-pages.diff
Description: Binary data

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