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An unexpected perf feature
LWN.net Weekly Edition for May 16, 2013
A look at the PyPy 2.0 release
PostgreSQL 9.3 beta: Federated databases and more
LWN.net Weekly Edition for May 9, 2013
Posted Jul 8, 2009 20:57 UTC (Wed) by elanthis (guest, #6227)
Posted Jul 9, 2009 0:44 UTC (Thu) by johill (subscriber, #25196)
See, if the host were to hash the pages I gave it (from the guest) with this API, and memcmp() them, it could with very little effort tell me it's stored it even though it just made a note that my ID(s) point to that particular page, and refcounted the page. This is easy since a page, once pushed from the guest to the host, is immutable.
The way the article was written though it seems that with the shared stuff, different hosts could access the same page frame by the same ID. So guest A could push out a page and guest B could retrieve it with that same ID? Where's the use in that?
Posted Jul 9, 2009 0:59 UTC (Thu) by ncm (subscriber, #165)
Posted Jul 9, 2009 14:35 UTC (Thu) by johill (subscriber, #25196)
Posted Jul 11, 2009 16:04 UTC (Sat) by MarkWilliamson (guest, #30166)
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