Messages in this thread | | | From | "Luca Porzio (lporzio)" <> | Subject | RE: swap on eMMC and other flash | Date | Mon, 2 Apr 2012 12:52:04 +0000 |
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Hugh,
Great topics. As per one of Rik original points:
> 4) skip writeout of zero-filled pages - this can be a big help > for KVM virtual machines running Windows, since Windows zeroes > out free pages; simply discarding a zero-filled page is not > at all simple in the current VM, where we would have to iterate > over all the ptes to free the swap entry before being able to > free the swap cache page (I am not sure how that locking would > even work) > > with the extra layer of indirection, the locking for this scheme > can be trivial - either the faulting process gets the old page, > or it gets a new one, either way it'll be zero filled >
Since it's KVMs realm here, can't KSM simply solve the zero-filled pages problem avoiding unnecessary burden for the Swap subsystem?
Cheers, Luca
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