SUNRPC: Add tracepoint that fires when an RPC is retransmitted

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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>

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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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include/trace/events/sunrpc.h

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