Re: Fwd: alloc_pages_bulk()

On Mon, Feb 08, 2021 at 05:50:51PM +0000, Chuck Lever wrote:

quoted

We've been discussing how NFSD can more efficiently refill its
receive buffers (currently alloc_page() in a loop; see
net/sunrpc/svc_xprt.c::svc_alloc_arg()).

I'm not familiar with the sunrpc architecture, but this feels like you're
trying to optimise something that shouldn't exist.  Ideally a write
would ask the page cache for the pages that correspond to the portion
of the file which is being written to.  I appreciate that doesn't work
well for, eg, NFS-over-TCP, but for NFS over any kind of RDMA, that
should be possible, right?