Hi, On 2012-11-21 16:22, Jello huang wrote: > HI Tomi, > we need one rank of cma to allocate the memory for driver in kernel > space .And the default CMA is for allocating memory frome usespace.So > if we allocate the memory from the > default CMA zone ,there maybe introduce fragmention to the default CMA > zone.The kernel space memory donot touch the memory from userspace Can you elaborate a bit? I didn't understand your point. Are you saying each kernel driver that uses dma_alloc should have their own CMA zone? That doesn't make sense... How do you allocate CMA memory from userspace? Tomi
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