Simplify the RPC socket transmission code by switching to using the iov_iter functionality. The main gain is that we avoid the need to take the socket lock on each call to sendpage(): in the common case of a 1MB WRITE rpc call using 4k page sizes, that means we go from 256 calls to sendpage(), each of which takes the socket lock and releases it, to just 1 call to sock_sendmsg(). Trond Myklebust (4): SUNRPC: Convert xs_send_kvec() to use iov_iter_kvec() SUNRPC: Convert socket page send code to use iov_iter() SUNRPC: Further cleanups of xs_sendpages() SUNRPC: Remove the redundant 'zerocopy' argument to xs_sendpages() net/sunrpc/xprt.c | 1 + net/sunrpc/xprtsock.c | 106 +++++++++++++++--------------------------- 2 files changed, 38 insertions(+), 69 deletions(-) -- 2.20.1
