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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>
This commit is contained in:
Trond Myklebust 2016-06-24 10:55:46 -04:00 committed by J. Bruce Fields
parent 82ea2d7615
commit 104f6351f7
2 changed files with 65 additions and 0 deletions
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61
include/trace/events/sunrpc.h
View File

@ -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>

4
net/sunrpc/svc_xprt.c
View File

@ -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);