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authorMatt Mullins <mmullins@fb.com>2019-04-26 21:49:48 +0300
committerAlexei Starovoitov <ast@kernel.org>2019-04-27 05:04:19 +0300
commitea106722c76f08002b69a6983ed84dc18958ba48 (patch)
tree740b273cebfa9af47c98530803177034d6abb851 /include/trace
parent9df1c28bb75217b244257152ab7d788bb2a386d0 (diff)
downloadlinux-ea106722c76f08002b69a6983ed84dc18958ba48.tar.xz
nbd: trace sending nbd requests
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>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/nbd.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/include/trace/events/nbd.h b/include/trace/events/nbd.h
new file mode 100644
index 000000000000..5928255ed02e
--- /dev/null
+++ b/include/trace/events/nbd.h
@@ -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>