SUNRPC: Add tracepoints for dropped and deferred requests

Dropping and/or deferring requests has an impact on performance. Let's
make sure we can trace those events.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 4d2189a562af..e7082a4aeb56 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -875,6 +875,7 @@ EXPORT_SYMBOL_GPL(svc_recv);
  */
 void svc_drop(struct svc_rqst *rqstp)
 {
+        trace_svc_drop(rqstp);
         dprintk("svc: xprt %p dropped request\n", rqstp->rq_xprt);
         svc_xprt_release(rqstp);
 }
@@ -1152,6 +1153,7 @@ static void svc_revisit(struct cache_deferred_req *dreq, int too_many)
                 spin_unlock(&xprt->xpt_lock);
                 dprintk("revisit canceled\n");
                 svc_xprt_put(xprt);
+                trace_svc_drop_deferred(dr);
                 kfree(dr);
                 return;
         }
@@ -1209,6 +1211,7 @@ static struct cache_deferred_req *svc_defer(struct cache_req *req)
         set_bit(RQ_DROPME, &rqstp->rq_flags);
 
         dr->handle.revisit = svc_revisit;
+        trace_svc_defer(rqstp);
         return &dr->handle;
 }
 
@@ -1249,6 +1252,7 @@ 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);