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nbd: trace sending nbd requests

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This adds a tracepoint that can both observe the nbd request being sent
to the server, as well as modify that request , e.g., setting a flag in
the request that will cause the server to collect detailed tracing data.

The struct request * being handled is included to permit correlation
with the block tracepoints.

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:
Matt Mullins 2019-04-26 11:49:48 -07:00 • committed by Alexei Starovoitov
parent 9df1c28bb7
commit ea106722c7
3 changed files with 62 additions and 0 deletions
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56
include/trace/events/nbd.h Normal file
View file

@ -0,0 +1,56 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM nbd
#if !defined(_TRACE_NBD_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_NBD_H
#include <linux/tracepoint.h>
DECLARE_EVENT_CLASS(nbd_send_request,
TP_PROTO(struct nbd_request *nbd_request, int index,
struct request *rq),
TP_ARGS(nbd_request, index, rq),
TP_STRUCT__entry(
__field(struct nbd_request *, nbd_request)
__field(u64, dev_index)
__field(struct request *, request)
),
TP_fast_assign(
__entry->nbd_request = 0;
__entry->dev_index = index;
__entry->request = rq;
),
TP_printk("nbd%lld: request %p", __entry->dev_index, __entry->request)
);
#ifdef DEFINE_EVENT_WRITABLE
#undef NBD_DEFINE_EVENT
#define NBD_DEFINE_EVENT(template, call, proto, args, size) \
DEFINE_EVENT_WRITABLE(template, call, PARAMS(proto), \
PARAMS(args), size)
#else
#undef NBD_DEFINE_EVENT
#define NBD_DEFINE_EVENT(template, call, proto, args, size) \
DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args))
#endif
NBD_DEFINE_EVENT(nbd_send_request, nbd_send_request,
TP_PROTO(struct nbd_request *nbd_request, int index,
struct request *rq),
TP_ARGS(nbd_request, index, rq),
sizeof(struct nbd_request)
);
#endif
/* This part must be outside protection */
#include <trace/define_trace.h>