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SubjectRe: [PATCH] VMware Balloon driver
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

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.



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