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nbd: add tracepoints for send/receive timing

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This adds four tracepoints to nbd, enabling separate tracing of payload
and header sending/receipt.

In the send path for headers that have already been sent, we also
explicitly initialize the handle so it can be referenced by the later
tracepoint.

Signed-off-by: Andrew Hall <hall@fb.com>
Signed-off-by: Matt Mullins <mmullins@fb.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrew Hall 2019-04-26 11:49:49 -07:00 • committed by Alexei Starovoitov
parent ea106722c7
commit 2abd2de712
2 changed files with 59 additions and 0 deletions
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51
include/trace/events/nbd.h
View file

@ -7,6 +7,57 @@
#include <linux/tracepoint.h>
DECLARE_EVENT_CLASS(nbd_transport_event,
TP_PROTO(struct request *req, u64 handle),
TP_ARGS(req, handle),
TP_STRUCT__entry(
__field(struct request *, req)
__field(u64, handle)
),
TP_fast_assign(
__entry->req = req;
__entry->handle = handle;
),
TP_printk(
"nbd transport event: request %p, handle 0x%016llx",
__entry->req,
__entry->handle
)
);
DEFINE_EVENT(nbd_transport_event, nbd_header_sent,
TP_PROTO(struct request *req, u64 handle),
TP_ARGS(req, handle)
);
DEFINE_EVENT(nbd_transport_event, nbd_payload_sent,
TP_PROTO(struct request *req, u64 handle),
TP_ARGS(req, handle)
);
DEFINE_EVENT(nbd_transport_event, nbd_header_received,
TP_PROTO(struct request *req, u64 handle),
TP_ARGS(req, handle)
);
DEFINE_EVENT(nbd_transport_event, nbd_payload_received,
TP_PROTO(struct request *req, u64 handle),
TP_ARGS(req, handle)
);
DECLARE_EVENT_CLASS(nbd_send_request,
TP_PROTO(struct nbd_request *nbd_request, int index,