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Commit 0c0746d0 authored by Trond Myklebust's avatar Trond Myklebust Committed by J. Bruce Fields
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SUNRPC: More optimisations of svc_xprt_enqueue() 



Just move the transport locking out of the spin lock protected area
altogether.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent a4aa8054

net/sunrpc/svc_xprt.c

+7 −14
Original line number Diff line number Diff line
@@ -346,18 +346,6 @@ static void svc_xprt_do_enqueue(struct svc_xprt *xprt) 
	if (!svc_xprt_has_something_to_do(xprt))

		return;



	cpu = get_cpu();

	pool = svc_pool_for_cpu(xprt->xpt_server, cpu);

	spin_lock_bh(&pool->sp_lock);



	if (!list_empty(&pool->sp_threads) &&

	    !list_empty(&pool->sp_sockets))

		printk(KERN_ERR

		       "svc_xprt_enqueue: "

		       "threads and transports both waiting??\n");



	pool->sp_stats.packets++;



	/* Mark transport as busy. It will remain in this state until

	 * the provider calls svc_xprt_received. We update XPT_BUSY

	 * atomically because it also guards against trying to enqueue
@@ -366,9 +354,15 @@ static void svc_xprt_do_enqueue(struct svc_xprt *xprt) 
	if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) {

		/* Don't enqueue transport while already enqueued */

		dprintk("svc: transport %p busy, not enqueued\n", xprt);

		goto out_unlock;

		return;

	}



	cpu = get_cpu();

	pool = svc_pool_for_cpu(xprt->xpt_server, cpu);

	spin_lock_bh(&pool->sp_lock);



	pool->sp_stats.packets++;



	if (!list_empty(&pool->sp_threads)) {

		rqstp = list_entry(pool->sp_threads.next,

				   struct svc_rqst,
@@ -395,7 +389,6 @@ static void svc_xprt_do_enqueue(struct svc_xprt *xprt) 
		pool->sp_stats.sockets_queued++;

	}



out_unlock:

	spin_unlock_bh(&pool->sp_lock);

	put_cpu();

}