David Xiao wrote: > Another approach is working from a different direction: the kernel > allocates the non-cached buffer and then mmap() into user space. I have > done that in similar situation to try to achieve "zero-copy". open(O_DIRECT) does DMA to arbitrary pages allocated by userspace, and O_DIRECT is used by some important applications, so the problem still needs to be solved in general. -- Jamie -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
