Messages in this thread | | | Date | Tue, 20 Mar 2012 12:18:08 +0200 | From | Avi Kivity <> | Subject | Re: [RFC][PATCH 00/26] sched/numa |
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On 03/19/2012 10:03 PM, Peter Zijlstra wrote: > On Mon, 2012-03-19 at 14:16 +0200, Avi Kivity wrote: > > > Afaik we do not use dma engines for memory migration. > > > > We don't, but I think we should. > > ISTR we (the community) had this discussion once. I also seem to > remember the general consensus being that DMA engines would mostly > likely not be worth the effort, although I can't really recall the > specifics. > > Esp. for 4k pages the setup of the offload will likely be more expensive > than actually doing the memcpy.
If you're copying a page, yes. If you're copying a large vma, the per-page setup cost is likely to be very low.
Especially if you're copying across nodes.
-- error compiling committee.c: too many arguments to function
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