On 1/17/19 11:47 PM, Yanmin Zhang wrote: > a chance for kernel to allocate PMEM as DMA buffer. > Some super speed devices like 10Giga NIC, USB (SSIC connecting modem), > might not work well if DMA buffer is in PMEM as it's slower than DRAM. > > Should your patchset consider it? No, I don't think so. They can DMA to persistent memory whether this patch set exists or not. So, if the hardware falls over, that's a separate problem. If an app wants memory that performs in a particular way, then I would suggest those app find the NUMA nodes on the system that match their needs with these patches: > http://lkml.kernel.org/r/20190116175804.30196-1-keith.busch@xxxxxxxxx and use the existing NUMA APIs to select that memory.
