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afs: Add a tracepoint for afs_read_receive()

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Add a tracepoint for afs_read_receive() to allow potential missed wakeups
to be debugged.

Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20241108173236.1382366-33-dhowells@redhat.com
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Howells 2024-11-08 17:32:33 +00:00 committed by Christian Brauner
parent 761dc4f0b8
commit 202d36ca3f
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GPG Key ID: 91C61BC06578DCA2
2 changed files with 31 additions and 0 deletions
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1
fs/afs/file.c
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@ -274,6 +274,7 @@ static void afs_read_receive(struct afs_call *call)
state = READ_ONCE(call->state);
if (state == AFS_CALL_COMPLETE)
return;
trace_afs_read_recv(op, call);
while (state < AFS_CALL_COMPLETE && READ_ONCE(call->need_attention)) {
WRITE_ONCE(call->need_attention, false);

30
include/trace/events/afs.h
View File

@ -1775,6 +1775,36 @@ TRACE_EVENT(afs_make_call,
__entry->fid.unique)
);
TRACE_EVENT(afs_read_recv,
TP_PROTO(const struct afs_operation *op, const struct afs_call *call),
TP_ARGS(op, call),
TP_STRUCT__entry(
__field(unsigned int, rreq)
__field(unsigned int, sreq)
__field(unsigned int, op)
__field(unsigned int, op_flags)
__field(unsigned int, call)
__field(enum afs_call_state, call_state)
),
TP_fast_assign(
__entry->op = op->debug_id;
__entry->sreq = op->fetch.subreq->debug_index;
__entry->rreq = op->fetch.subreq->rreq->debug_id;
__entry->op_flags = op->flags;
__entry->call = call->debug_id;
__entry->call_state = call->state;
),
TP_printk("R=%08x[%x] OP=%08x c=%08x cs=%x of=%x",
__entry->rreq, __entry->sreq,
__entry->op,
__entry->call, __entry->call_state,
__entry->op_flags)
);
#endif /* _TRACE_AFS_H */
/* This part must be outside protection */