Avoid memory starvation by giving RPCs that are tagged with the
RPC_TASK_SWAPPER flag the highest priority.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
net/sunrpc/xprt.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index e07a54fbe1e7..68974966b2e4 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1111,6 +1111,17 @@ 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)
--
2.17.1
