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Subject: [PATCH v1 4/4] SUNRPC: Clean up request deferral tracepoints
From:   Chuck Lever <chuck.lever@oracle.com>
To:     linux-nfs@vger.kernel.org
Date:   Fri, 01 May 2020 13:22:27 -0400
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- Rename these so they are easy to enable and search for as a set
- Move the tracepoints to get a more accurate sense of control flow
- Tracepoints should not fire on xprt shutdown
- Display memory address in case data structure had been corrupted
- Abandon dprintk in these paths

I haven't ever gotten one of these tracepoints to trigger. I wonder
if we should simply remove them.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 include/trace/events/sunrpc.h |   11 ++++++++---
 net/sunrpc/svc_xprt.c         |   12 ++++++------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
index ffd2215950dc..3158b3f7e01e 100644
--- a/include/trace/events/sunrpc.h
+++ b/include/trace/events/sunrpc.h
@@ -1313,27 +1313,32 @@ DECLARE_EVENT_CLASS(svc_deferred_event,
 	TP_ARGS(dr),
 
 	TP_STRUCT__entry(
+		__field(const void *, dr)
 		__field(u32, xid)
 		__string(addr, dr->xprt->xpt_remotebuf)
 	),
 
 	TP_fast_assign(
+		__entry->dr = dr;
 		__entry->xid = be32_to_cpu(*(__be32 *)(dr->args +
 						       (dr->xprt_hlen>>2)));
 		__assign_str(addr, dr->xprt->xpt_remotebuf);
 	),
 
-	TP_printk("addr=%s xid=0x%08x", __get_str(addr), __entry->xid)
+	TP_printk("addr=%s dr=%p xid=0x%08x", __get_str(addr), __entry->dr,
+		__entry->xid)
 );
+
 #define DEFINE_SVC_DEFERRED_EVENT(name) \
-	DEFINE_EVENT(svc_deferred_event, svc_##name##_deferred, \
+	DEFINE_EVENT(svc_deferred_event, svc_defer_##name, \
 			TP_PROTO( \
 				const struct svc_deferred_req *dr \
 			), \
 			TP_ARGS(dr))
 
 DEFINE_SVC_DEFERRED_EVENT(drop);
-DEFINE_SVC_DEFERRED_EVENT(revisit);
+DEFINE_SVC_DEFERRED_EVENT(queue);
+DEFINE_SVC_DEFERRED_EVENT(recv);
 
 DECLARE_EVENT_CLASS(cache_event,
 	TP_PROTO(
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 2284ff038dad..e12ec68cd0ff 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -1158,16 +1158,15 @@ static void svc_revisit(struct cache_deferred_req *dreq, int too_many)
 	set_bit(XPT_DEFERRED, &xprt->xpt_flags);
 	if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) {
 		spin_unlock(&xprt->xpt_lock);
-		dprintk("revisit canceled\n");
+		trace_svc_defer_drop(dr);
 		svc_xprt_put(xprt);
-		trace_svc_drop_deferred(dr);
 		kfree(dr);
 		return;
 	}
-	dprintk("revisit queued\n");
 	dr->xprt = NULL;
 	list_add(&dr->handle.recent, &xprt->xpt_deferred);
 	spin_unlock(&xprt->xpt_lock);
+	trace_svc_defer_queue(dr);
 	svc_xprt_enqueue(xprt);
 	svc_xprt_put(xprt);
 }
@@ -1213,22 +1212,24 @@ static struct cache_deferred_req *svc_defer(struct cache_req *req)
 		memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip,
 		       dr->argslen << 2);
 	}
+	trace_svc_defer(rqstp);
 	svc_xprt_get(rqstp->rq_xprt);
 	dr->xprt = rqstp->rq_xprt;
 	set_bit(RQ_DROPME, &rqstp->rq_flags);
 
 	dr->handle.revisit = svc_revisit;
-	trace_svc_defer(rqstp);
 	return &dr->handle;
 }
 
 /*
  * recv data from a deferred request into an active one
  */
-static int svc_deferred_recv(struct svc_rqst *rqstp)
+static noinline int svc_deferred_recv(struct svc_rqst *rqstp)
 {
 	struct svc_deferred_req *dr = rqstp->rq_deferred;
 
+	trace_svc_defer_recv(dr);
+
 	/* setup iov_base past transport header */
 	rqstp->rq_arg.head[0].iov_base = dr->args + (dr->xprt_hlen>>2);
 	/* The iov_len does not include the transport header bytes */
@@ -1259,7 +1260,6 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt)
 				struct svc_deferred_req,
 				handle.recent);
 		list_del_init(&dr->handle.recent);
-		trace_svc_revisit_deferred(dr);
 	} else
 		clear_bit(XPT_DEFERRED, &xprt->xpt_flags);
 	spin_unlock(&xprt->xpt_lock);