On Thu, Nov 16, 2017 at 1:29 PM, Jerome Glisse <jglisse@xxxxxxxxxx> wrote: > > For the NUMA discussion this is related to CPU less node ie not wanting > to add any more CPU less node (node with only memory) and they are other > aspect too. For instance you do not necessarily have good informations > from the device to know if a page is access a lot by the device (this > kind of information is often only accessible by the device driver). Thus @Jerome - one comment w.r.t 'do not necessarily have good info on device access'. So you could be assuming a few things here :). CCIX extends the CPU complex's coherency domain(it is now a single/unified coherency domain). The CCIX-EP (lets say an accelerator/XPU or a NIC or a combo) is now a true peer w.r.t the host-numa-node(s) (aka 1st class citizen). I don't know how much info was revealed at the latest ARM techcon where CCIX was presented. So I cannot divulge any further details until I see that slide deck. However, you can safely assume that the host will have *all* the info w.r.t the device-access and vice-versa. Chetan
