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SUNRPC: Merge svc_do_enqueue_xprt() into svc_enqueue_xprt()

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Neil says:
"These functions were separated in commit 0971374e28 ("SUNRPC:
Reduce contention in svc_xprt_enqueue()") so that the XPT_BUSY check
happened before taking any spinlocks.

We have since moved or removed the spinlocks so the extra test is
fairly pointless."

I've made this a separate patch in case the XPT_BUSY change has
unexpected consequences and needs to be reverted.

Suggested-by: Neil Brown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2022-01-25 17:57:23 -05:00
parent a9ff2e99e9
commit c0219c4997
1 changed files with 10 additions and 16 deletions
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26
net/sunrpc/svc_xprt.c
View file

@ -32,7 +32,6 @@ static int svc_deferred_recv(struct svc_rqst *rqstp);
static struct cache_deferred_req *svc_defer(struct cache_req *req);
static void svc_age_temp_xprts(struct timer_list *t);
static void svc_delete_xprt(struct svc_xprt *xprt);
static void svc_xprt_do_enqueue(struct svc_xprt *xprt);
/* apparently the "standard" is that clients close
* idle connections after 5 minutes, servers after
@ -267,12 +266,12 @@ void svc_xprt_received(struct svc_xprt *xprt)
}
/* As soon as we clear busy, the xprt could be closed and
* 'put', so we need a reference to call svc_xprt_do_enqueue with:
* 'put', so we need a reference to call svc_xprt_enqueue with:
*/
svc_xprt_get(xprt);
smp_mb__before_atomic();
clear_bit(XPT_BUSY, &xprt->xpt_flags);
svc_xprt_do_enqueue(xprt);
svc_xprt_enqueue(xprt);
svc_xprt_put(xprt);
}
EXPORT_SYMBOL_GPL(svc_xprt_received);
@ -412,6 +411,8 @@ static bool svc_xprt_ready(struct svc_xprt *xprt)
smp_rmb();
xpt_flags = READ_ONCE(xprt->xpt_flags);
if (xpt_flags & BIT(XPT_BUSY))
return false;
if (xpt_flags & (BIT(XPT_CONN) | BIT(XPT_CLOSE)))
return true;
if (xpt_flags & (BIT(XPT_DATA) | BIT(XPT_DEFERRED))) {
@ -424,7 +425,12 @@ static bool svc_xprt_ready(struct svc_xprt *xprt)
return false;
}
static void svc_xprt_do_enqueue(struct svc_xprt *xprt)
/**
* svc_xprt_enqueue - Queue a transport on an idle nfsd thread
* @xprt: transport with data pending
*
*/
void svc_xprt_enqueue(struct svc_xprt *xprt)
{
struct svc_pool *pool;
struct svc_rqst *rqstp = NULL;
@ -468,18 +474,6 @@ static void svc_xprt_do_enqueue(struct svc_xprt *xprt)
put_cpu();
trace_svc_xprt_enqueue(xprt, rqstp);
}
/*
* Queue up a transport with data pending. If there are idle nfsd
* processes, wake 'em up.
*
*/
void svc_xprt_enqueue(struct svc_xprt *xprt)
{
if (test_bit(XPT_BUSY, &xprt->xpt_flags))
return;
svc_xprt_do_enqueue(xprt);
}
EXPORT_SYMBOL_GPL(svc_xprt_enqueue);
/*