Messages in this thread | | | Subject | RE: Frontswap [PATCH 0/4] (was Transcendent Memory): overview | From | Dave Hansen <> | Date | Fri, 30 Apr 2010 09:08:00 -0700 |
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On Fri, 2010-04-30 at 08:59 -0700, Dan Magenheimer wrote: > Dave or others can correct me if I am wrong, but I think CMM2 also > handles dirty pages that must be retained by the hypervisor. The > difference between CMM2 (for dirty pages) and frontswap is that > CMM2 sets hints that can be handled asynchronously while frontswap > provides explicit hooks that synchronously succeed/fail.
Once pages were dirtied (or I guess just slightly before), they became volatile, and I don't think the hypervisor could do anything with them. It could still swap them out like usual, but none of the CMM-specific optimizations could be performed.
CC'ing Martin since he's the expert. :)
-- Dave
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