Messages in this thread |  | | From | kuznet@ms2 ... | Subject | Re: Is sendfile all that sexy? | Date | Sat, 20 Jan 2001 21:53:42 +0300 (MSK) |
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Hello!
> Actually, as long as there is no "struct page" there _are_ problems. > This is why the NUMA stuff was brought up - it would require that there > be a mem_map for the PCI pages.. (to do ref-counting etc).
I see.
Is this strong "no-no-no"? What is obstacle to allow "struct page" to sit outside of mem_map (in some private table, or as full orphan)? Only bloat of struct page with reference to some "page_ops" or something more profound?
> It does work at least on some hardware. But no, I don't think you can > depend on bursting (but I don't see why it couldn't work in theory).
I do not see too, but documents are pretty obscure explaining this. MRM seems to be prohibited for pci-pci. But my education is still not enough even to understand, whether MRM is required to burst or this is fully orthogonal yet. 8)
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