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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.


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