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| author |   Chuck Lever <chuck.lever@oracle.com> | 2022-01-25 17:57:23 -0500 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2022-02-28 10:26:39 -0500 |
| commit | c0219c499799c1e92bd570c15a47e6257a27bb15 (patch) | |
| tree | 6c07c77a5615aea5a04a947001810e152838e12d /net/sunrpc/svc_xprt.c | |
| parent | SUNRPC: Remove the .svo_enqueue_xprt method (diff) | |
| download | linux-dev-c0219c499799c1e92bd570c15a47e6257a27bb15.tar.xz linux-dev-c0219c499799c1e92bd570c15a47e6257a27bb15.zip | |
SUNRPC: Merge svc_do_enqueue_xprt() into svc_enqueue_xprt()
Neil says:
"These functions were separated in commit 0971374e2818 ("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>
Diffstat (limited to 'net/sunrpc/svc_xprt.c')
| -rw-r--r-- | net/sunrpc/svc_xprt.c | 26 |
1 files changed, 10 insertions, 16 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c index 9fce4f7774bb..1c2295209d08 100644 --- a/net/sunrpc/svc_xprt.c +++ b/net/sunrpc/svc_xprt.c @@ -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 @@ out_unlock: 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); /* |