[0/4] Simplify the RPC client socket transmit code

Message

Trond Myklebust Feb. 20, 2019, 3:03 a.m. UTC

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(-)