On Thu, Feb 02, 2017 at 08:00:52AM -0500, Jeff Layton wrote: > Yeah, that might work. You could kmalloc the buffer array according to > the maxsize value. For small ones we could even consider using an on- > stack buffer. For the block direct I/O code we defintively want to avoid any allocations for small I/O a that shows up in the performance numbers. And we'd like to reuse the on-stack bio_vec so that the defintion of a small I/O can be as big as possible without blowing up the stack.
