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SubjectRe: [PATCH] VMware Balloon driver
On 04/06/2010 11:36 AM, Avi Kivity wrote:
> On 04/06/2010 09:25 PM, Jeremy Fitzhardinge wrote:
>> On 04/06/2010 09:32 AM, Avi Kivity wrote:
>>> Yeah. If we wanted commonality, we could make a balloon_core.c that
>>> contains the common code. IMO that's premature, but perhaps there's
>>> some meat there (like suspend/resume support and /proc//sys interface).
>>
>> I think it would be useful to have common:
>>
>> 1. User and kernel mode ABIs for controlling ballooning. It assumes
>> that the different balloon implementations are sufficiently
>> similar in semantics. (Once there's a kernel ABI, adding a
>> common user ABI is trivial.)
>> 2. Policy driving the ballooning driver, at least from the guest
>> side. That is, some good metrics from the vm subsystem about
>> memory pressure (both positive and negative), and something to
>> turn those metrics into requests to the balloon driver.
>>
>> 1) is not a huge amount of code, but something consistent would be
>> nice. 2) is something we've been missing and is a bit of an open
>> question/research project anyway.
>
> 3) Code that attempts to reclaim 2MB pages when possible

Yes. Ballooning in 4k units is a bit silly.

J



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