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    SubjectRe: [GIT PULL] mm: frontswap (for 3.2 window)
    On 11/15/2011 08:29 AM, Rik van Riel wrote:
    > On 11/02/2011 05:14 PM, Dan Magenheimer wrote:
    >> It occurs to me that batching could be done locally without
    >> changing the in-kernel "API" (i.e. frontswap_ops)... the
    >> guest-side KVM tmem-backend-driver could do the compression
    >> into guest-side memory and make a single
    >> hypercall=vmexit/vmenter whenever it has collected enough for
    >> a batch.
    > That seems like the best way to do it, indeed.
    > Do the current hooks allow that mode of operation,
    > or do the hooks only return after the entire operation
    > has completed?

    The APIs are synchronous, but need only return once the memory has been
    dealt with in some way. If you were batching before making a hypercall,
    then the implementation would just have to make a copy into its private
    memory and you'd have to make sure that lookups on batched but
    unsubmitted pages work.

    (It's been a while since I've looked at these patches, but I'm assuming
    nothing fundamental has changed about them lately.)


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      Last update: 2011-11-15 18:35    [W:0.026 / U:40.972 seconds]
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