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SUNRPC: Avoid an unnecessary task reschedule on ENOTCONN 

If the socket is unconnected, and xprt_transmit() returns ENOTCONN, we
currently give up the lock on the transport channel. Doing so means that
the lock automatically gets assigned to the next task in the xprt->sending
queue, and so that task needs to be woken up to do the actual connect.

The following patch aims to avoid that unnecessary task switch.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2009-03-11 14:37:57 -04:00
parent a67d18f89f
commit 15f081ca8d
1 changed files with 18 additions and 8 deletions
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26
net/sunrpc/clnt.c
View File

@ -1105,14 +1105,24 @@ static void
call_transmit_status(struct rpc_task *task)
{
task->tk_action = call_status;
/*
* Special case: if we've been waiting on the socket's write_space()
* callback, then don't call xprt_end_transmit().
*/
if (task->tk_status == -EAGAIN)
return;
xprt_end_transmit(task);
rpc_task_force_reencode(task);
switch (task->tk_status) {
case -EAGAIN:
break;
default:
xprt_end_transmit(task);
/*
* Special cases: if we've been waiting on the
* socket's write_space() callback, or if the
* socket just returned a connection error,
* then hold onto the transport lock.
*/
case -ECONNREFUSED:
case -ENOTCONN:
case -EHOSTDOWN:
case -EHOSTUNREACH:
case -ENETUNREACH:
rpc_task_force_reencode(task);
}
}
/*