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SUNRPC: More optimisations of svc_xprt_enqueue()

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

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2014-08-03 13:03:12 -04:00 • committed by J. Bruce Fields
parent a4aa8054a6
commit 0c0746d03e
1 changed files with 7 additions and 14 deletions
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21
net/sunrpc/svc_xprt.c
View file

@ -346,18 +346,6 @@ static void svc_xprt_do_enqueue(struct svc_xprt *xprt)
if (!svc_xprt_has_something_to_do(xprt)) if (!svc_xprt_has_something_to_do(xprt))
return; 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 /* Mark transport as busy. It will remain in this state until
* the provider calls svc_xprt_received. We update XPT_BUSY * the provider calls svc_xprt_received. We update XPT_BUSY
* atomically because it also guards against trying to enqueue * 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)) { if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) {
/* Don't enqueue transport while already enqueued */ /* Don't enqueue transport while already enqueued */
dprintk("svc: transport %p busy, not enqueued\n", xprt); 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)) { if (!list_empty(&pool->sp_threads)) {
rqstp = list_entry(pool->sp_threads.next, rqstp = list_entry(pool->sp_threads.next,
struct svc_rqst, struct svc_rqst,
@ -395,7 +389,6 @@ static void svc_xprt_do_enqueue(struct svc_xprt *xprt)
pool->sp_stats.sockets_queued++; pool->sp_stats.sockets_queued++;
} }
out_unlock:
spin_unlock_bh(&pool->sp_lock); spin_unlock_bh(&pool->sp_lock);
put_cpu(); put_cpu();
} }