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svc: Report xprt dequeue latency

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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>
This commit is contained in:
Chuck Lever
2018-03-27 10:52:27 -04:00
committed by J. Bruce Fields
parent aaba72cd4e
commit 55f5088c22
3 changed files with 29 additions and 6 deletions
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4
net/sunrpc/svc_xprt.c
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@@ -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;
}