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xprtrdma: Avoid calls to ro_unmap_safe() 

Micro-optimization: Most of the time, calls to ro_unmap_safe are
expensive no-ops. Call only when there is work to do.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2016-11-29 10:52:48 -05:00 committed by Anna Schumaker
parent 109b88ab9d
commit 48016dce46
1 changed files with 4 additions and 2 deletions
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6
net/sunrpc/xprtrdma/transport.c
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@ -621,7 +621,8 @@ xprt_rdma_free(struct rpc_task *task)
dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply);
ia->ri_ops->ro_unmap_safe(r_xprt, req, !RPC_IS_ASYNC(task));
if (unlikely(!list_empty(&req->rl_registered)))
ia->ri_ops->ro_unmap_safe(r_xprt, req, !RPC_IS_ASYNC(task));
rpcrdma_unmap_sges(ia, req);
rpcrdma_buffer_put(req);
}
@ -657,7 +658,8 @@ xprt_rdma_send_request(struct rpc_task *task)
int rc = 0;
/* On retransmit, remove any previously registered chunks */
r_xprt->rx_ia.ri_ops->ro_unmap_safe(r_xprt, req, false);
if (unlikely(!list_empty(&req->rl_registered)))
r_xprt->rx_ia.ri_ops->ro_unmap_safe(r_xprt, req, false);
rc = rpcrdma_marshal_req(rqst);
if (rc < 0)