Commit e19b63da authored by Chuck Lever's avatar Chuck Lever Committed by Trond Myklebust
Browse files

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: default avatarChuck Lever <cel@netapp.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 67ec9f46

include/linux/sunrpc/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -203,6 +203,7 @@ struct rpc_wait_queue { 
	unsigned char		priority;		/* current priority */

	unsigned char		count;			/* # task groups remaining serviced so far */

	unsigned char		nr;			/* # tasks remaining for cookie */

	unsigned short		qlen;			/* total # tasks waiting in queue */

#ifdef RPC_DEBUG

	const char *		name;

#endif

net/sunrpc/sched.c

+2 −0
Original line number Diff line number Diff line
@@ -181,6 +181,7 @@ static void __rpc_add_wait_queue(struct rpc_wait_queue *queue, struct rpc_task * 
	else

		list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]);

	task->u.tk_wait.rpc_waitq = queue;

	queue->qlen++;

	rpc_set_queued(task);



	dprintk("RPC: %4d added to queue %p \"%s\"\n",
@@ -215,6 +216,7 @@ static void __rpc_remove_wait_queue(struct rpc_task *task) 
		__rpc_remove_wait_queue_priority(task);

	else

		list_del(&task->u.tk_wait.list);

	queue->qlen--;

	dprintk("RPC: %4d removed from queue %p \"%s\"\n",

				task->tk_pid, queue, rpc_qname(queue));

}