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Commit 104f6351 authored by Trond Myklebust's avatar Trond Myklebust Committed by J. Bruce Fields
Browse files

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: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 82ea2d76

include/trace/events/sunrpc.h

+61 −0
Original line number Diff line number Diff line
@@ -473,6 +473,39 @@ TRACE_EVENT(svc_recv, 
			show_rqstp_flags(__entry->flags))

);



DECLARE_EVENT_CLASS(svc_rqst_event,



	TP_PROTO(struct svc_rqst *rqst),



	TP_ARGS(rqst),



	TP_STRUCT__entry(

		__field(__be32, xid)

		__field(unsigned long, flags)

		__dynamic_array(unsigned char, addr, rqst->rq_addrlen)

	),



	TP_fast_assign(

		__entry->xid = rqst->rq_xid;

		__entry->flags = rqst->rq_flags;

		memcpy(__get_dynamic_array(addr),

			&rqst->rq_addr, rqst->rq_addrlen);

	),



	TP_printk("addr=%pIScp rq_xid=0x%x flags=%s",

		(struct sockaddr *)__get_dynamic_array(addr),

		be32_to_cpu(__entry->xid),

		show_rqstp_flags(__entry->flags))

);



DEFINE_EVENT(svc_rqst_event, svc_defer,

	TP_PROTO(struct svc_rqst *rqst),

	TP_ARGS(rqst));



DEFINE_EVENT(svc_rqst_event, svc_drop,

	TP_PROTO(struct svc_rqst *rqst),

	TP_ARGS(rqst));



DECLARE_EVENT_CLASS(svc_rqst_status,



	TP_PROTO(struct svc_rqst *rqst, int status),
@@ -636,6 +669,34 @@ TRACE_EVENT(svc_handle_xprt, 
			(struct sockaddr *)__get_dynamic_array(addr) : NULL,

		__entry->len, show_svc_xprt_flags(__entry->flags))

);





DECLARE_EVENT_CLASS(svc_deferred_event,

	TP_PROTO(struct svc_deferred_req *dr),



	TP_ARGS(dr),



	TP_STRUCT__entry(

		__field(__be32, xid)

		__dynamic_array(unsigned char, addr, dr->addrlen)

	),



	TP_fast_assign(

		__entry->xid = *(__be32 *)(dr->args + (dr->xprt_hlen>>2));

		memcpy(__get_dynamic_array(addr), &dr->addr, dr->addrlen);

	),



	TP_printk("addr=%pIScp xid=0x%x",

		(struct sockaddr *)__get_dynamic_array(addr),

		be32_to_cpu(__entry->xid))

);



DEFINE_EVENT(svc_deferred_event, svc_drop_deferred,

	TP_PROTO(struct svc_deferred_req *dr),

	TP_ARGS(dr));

DEFINE_EVENT(svc_deferred_event, svc_revisit_deferred,

	TP_PROTO(struct svc_deferred_req *dr),

	TP_ARGS(dr));

#endif /* _TRACE_SUNRPC_H */



#include <trace/define_trace.h>

net/sunrpc/svc_xprt.c

+4 −0
Original line number Diff line number Diff line
@@ -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);