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Commit 86aeee0e authored by Trond Myklebust's avatar Trond Myklebust
Browse files

SUNRPC: Enqueue swapper tagged RPCs at the head of the transmit queue 



Avoid memory starvation by giving RPCs that are tagged with the
RPC_TASK_SWAPPER flag the highest priority.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent 75891f50

net/sunrpc/xprt.c

+11 −0
Original line number Diff line number Diff line
@@ -1112,6 +1112,17 @@ xprt_request_enqueue_transmit(struct rpc_task *task) 
				INIT_LIST_HEAD(&req->rq_xmit2);

				goto out;

			}

		} else if (RPC_IS_SWAPPER(task)) {

			list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) {

				if (pos->rq_cong || pos->rq_bytes_sent)

					continue;

				if (RPC_IS_SWAPPER(pos->rq_task))

					continue;

				/* Note: req is added _before_ pos */

				list_add_tail(&req->rq_xmit, &pos->rq_xmit);

				INIT_LIST_HEAD(&req->rq_xmit2);

				goto out;

			}

		} else {

			list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) {

				if (pos->rq_task->tk_owner != task->tk_owner)