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| author | Chuck Lever <chuck.lever@oracle.com> | 2016-11-29 18:52:48 +0300 |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2016-11-30 00:45:44 +0300 |
| commit | 48016dce46ad504a378849490bfb99c98be5cfaa (patch) | |
| tree | 80c29e78c16c835639cbdd05c28ddb93ee378640 | |
| parent | 109b88ab9d78f76b3f6f42155cac2241f2ad2e31 (diff) | |
| download | linux-48016dce46ad504a378849490bfb99c98be5cfaa.tar.xz | |
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>
| -rw-r--r-- | net/sunrpc/xprtrdma/transport.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c index ed5e285fd2ea..545d3fc8de5a 100644 --- a/net/sunrpc/xprtrdma/transport.c +++ b/net/sunrpc/xprtrdma/transport.c @@ -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) |