[PATCH v4 32/33] afs: Add a tracepoint for afs_read_receive()

David Howells
2024-11-08T17:36:52Z

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

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
---
fs/afs/file.c | 1 +
include/trace/events/afs.h | 30 ++++++++++++++++++++++++++++++
2 files changed, 31 insertions(+)

diff --git a/fs/afs/file.c b/fs/afs/file.c
index c296efebb491..fc15497608c6 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -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);
diff --git a/include/trace/events/afs.h b/include/trace/events/afs.h
index c52fd83ca9b7..2e92487f3f34 100644
--- a/include/trace/events/afs.h
+++ b/include/trace/events/afs.h
@@ -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 */