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SUNRPC: Add tracepoint that fires when an RPC is retransmitted 

A separate tracepoint can be left enabled all the time to capture
rare but important retransmission events. So for example:

kworker/u26:3-568   [009]   156.967933: xprt_retransmit:      task:44093@5 xid=0xa25dbc79 nfsv3 WRITE ntrans=2

Or, for example, enable all nfs and nfs4 tracepoints, and set up a
trigger to disable tracing when xprt_retransmit fires to capture
everything that leads up to it.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Chuck Lever 2021-03-31 13:22:27 -04:00 committed by Trond Myklebust
parent 7638e0bfae
commit e936a5970e
2 changed files with 43 additions and 1 deletions
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40
include/trace/events/sunrpc.h
View File

@ -1079,6 +1079,46 @@ TRACE_EVENT(xprt_transmit,
__entry->seqno, __entry->status)
);
TRACE_EVENT(xprt_retransmit,
TP_PROTO(
const struct rpc_rqst *rqst
),
TP_ARGS(rqst),
TP_STRUCT__entry(
__field(unsigned int, task_id)
__field(unsigned int, client_id)
__field(u32, xid)
__field(int, ntrans)
__field(int, version)
__string(progname,
rqst->rq_task->tk_client->cl_program->name)
__string(procedure,
rqst->rq_task->tk_msg.rpc_proc->p_name)
),
TP_fast_assign(
struct rpc_task *task = rqst->rq_task;
__entry->task_id = task->tk_pid;
__entry->client_id = task->tk_client ?
task->tk_client->cl_clid : -1;
__entry->xid = be32_to_cpu(rqst->rq_xid);
__entry->ntrans = rqst->rq_ntrans;
__assign_str(progname,
task->tk_client->cl_program->name)
__entry->version = task->tk_client->cl_vers;
__assign_str(procedure, task->tk_msg.rpc_proc->p_name)
),
TP_printk(
"task:%u@%u xid=0x%08x %sv%d %s ntrans=%d",
__entry->task_id, __entry->client_id, __entry->xid,
__get_str(progname), __entry->version, __get_str(procedure),
__entry->ntrans)
);
TRACE_EVENT(xprt_ping,
TP_PROTO(const struct rpc_xprt *xprt, int status),

4
net/sunrpc/xprt.c
View File

@ -1542,8 +1542,10 @@ xprt_request_transmit(struct rpc_rqst *req, struct rpc_task *snd_task)
return status;
}
if (is_retrans)
if (is_retrans) {
task->tk_client->cl_stats->rpcretrans++;
trace_xprt_retransmit(req);
}
xprt_inject_disconnect(xprt);