在Linux中物理连续与虚拟非连续

Question

I have a requirement for large video frame buffer that needs to be physically contiguous. So my question is when kernel driver request physical contig memory, the virtual address returned by kernel will be contiguous or non-contig?

Update: My apology, let me add more details. For a video buffer of resolution 640x480 with each pixel of 1 byte, the total memory expected 307200 bytes (640x480). For a system that works on 4KiB page, the total pages needed by above buffer will be 75.

Now lets assume in some way this 307200 memory block requested is physically contiguous. But when virtual address of each page is being returned by kernel, will those pages be contiguous or non-contiguous?

Answer 1

连续的-内核虚拟地址空间映射通常与物理内存为1-1（即V = P +偏移）