SUNRPC: track length of RPC wait queues
RPC wait queue length will eventually be exported to userland via the RPC iostats interface. Test plan: Compile kernel with CONFIG_NFS enabled. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -203,6 +203,7 @@ struct rpc_wait_queue {
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unsigned char priority; /* current priority */
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unsigned char count; /* # task groups remaining serviced so far */
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unsigned char nr; /* # tasks remaining for cookie */
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unsigned short qlen; /* total # tasks waiting in queue */
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#ifdef RPC_DEBUG
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const char * name;
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#endif
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@ -181,6 +181,7 @@ static void __rpc_add_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *
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else
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list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]);
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task->u.tk_wait.rpc_waitq = queue;
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queue->qlen++;
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rpc_set_queued(task);
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dprintk("RPC: %4d added to queue %p \"%s\"\n",
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@ -215,6 +216,7 @@ static void __rpc_remove_wait_queue(struct rpc_task *task)
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__rpc_remove_wait_queue_priority(task);
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else
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list_del(&task->u.tk_wait.list);
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queue->qlen--;
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dprintk("RPC: %4d removed from queue %p \"%s\"\n",
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task->tk_pid, queue, rpc_qname(queue));
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}
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