From: Chuck Lever chuck.lever@oracle.com
[ Upstream commit 6f9f17287e78e5049931af2037b15b26d134a32a ]
The original purpose of this expensive call is to prevent a long queue of requests from blocking other work.
The cond_resched() call is unnecessary after just a single send operation.
For longer queues, instead of invoking the kernel scheduler, simply release the transport send lock and return to the RPC scheduler.
Signed-off-by: Chuck Lever chuck.lever@oracle.com Signed-off-by: Anna Schumaker Anna.Schumaker@Netapp.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/sunrpc/xprt.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 41df4c507193b..a6fee86f400ec 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -1503,10 +1503,13 @@ xprt_transmit(struct rpc_task *task) { struct rpc_rqst *next, *req = task->tk_rqstp; struct rpc_xprt *xprt = req->rq_xprt; - int status; + int counter, status;
spin_lock(&xprt->queue_lock); + counter = 0; while (!list_empty(&xprt->xmit_queue)) { + if (++counter == 20) + break; next = list_first_entry(&xprt->xmit_queue, struct rpc_rqst, rq_xmit); xprt_pin_rqst(next); @@ -1514,7 +1517,6 @@ xprt_transmit(struct rpc_task *task) status = xprt_request_transmit(next, task); if (status == -EBADMSG && next != req) status = 0; - cond_resched(); spin_lock(&xprt->queue_lock); xprt_unpin_rqst(next); if (status == 0) {