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authorChuck Lever <chuck.lever@oracle.com>2018-03-27 17:52:27 +0300
committerJ. Bruce Fields <bfields@redhat.com>2018-04-03 22:08:13 +0300
commit55f5088c22cc83dbc64394abfbf76cd1ff5e7cd0 (patch)
tree229d0f82add5b8107c1a9ebe3890d43507a5dcc2 /net/sunrpc/svc_xprt.c
parentaaba72cd4e793fbf1c04e06dee3d2c3710339678 (diff)
downloadlinux-55f5088c22cc83dbc64394abfbf76cd1ff5e7cd0.tar.xz
svc: Report xprt dequeue latency
Record the time between when a rqstp is enqueued on a transport and when it is dequeued. This includes how long the rqstp waits on the queue and how long it takes the kernel scheduler to wake a nfsd thread to service it. The svc_xprt_dequeue trace point is altered to include the number of microseconds between xprt_enqueue and xprt_dequeue. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc/svc_xprt.c')
-rw-r--r--net/sunrpc/svc_xprt.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index a7425da14f5b..5185efb9027b 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -409,6 +409,7 @@ void svc_xprt_do_enqueue(struct svc_xprt *xprt)
if (test_and_set_bit(RQ_BUSY, &rqstp->rq_flags))
continue;
atomic_long_inc(&pool->sp_stats.threads_woken);
+ rqstp->rq_qtime = ktime_get();
wake_up_process(rqstp->rq_task);
goto out_unlock;
}
@@ -530,7 +531,6 @@ void svc_wake_up(struct svc_serv *serv)
if (test_bit(RQ_BUSY, &rqstp->rq_flags))
continue;
rcu_read_unlock();
- dprintk("svc: daemon %p woken up.\n", rqstp);
wake_up_process(rqstp->rq_task);
trace_svc_wake_up(rqstp->rq_task->pid);
return;
@@ -726,7 +726,7 @@ out_found:
rqstp->rq_chandle.thread_wait = 5*HZ;
else
rqstp->rq_chandle.thread_wait = 1*HZ;
- trace_svc_xprt_dequeue(rqstp->rq_xprt);
+ trace_svc_xprt_dequeue(rqstp);
return rqstp->rq_xprt;
}