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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org, linux-trace-devel@vger.kernel.org
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@redhat.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	"Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
Subject: [PATCH 1/9] tools lib traceevent: Add API to read time information from kbuffer
Date: Thu, 02 Jul 2020 13:10:17 -0400	[thread overview]
Message-ID: <20200702171156.888894388@goodmis.org> (raw)
In-Reply-To: 20200702171016.178196716@goodmis.org

From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

Add the functions kbuffer_subbuf_timestamp() and kbuffer_ptr_delta() to get
the timing data stored in the ring buffer that is used to produced the time
stamps of the records.

This is useful for tools like trace-cmd to be able to display the content of
the read data to understand why the records show the time stamps that they
do.

Link: http://lore.kernel.org/linux-trace-devel/20200625100516.365338-2-tz.stoyanov@gmail.com

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 tools/lib/traceevent/kbuffer-parse.c | 28 ++++++++++++++++++++++++++++
 tools/lib/traceevent/kbuffer.h       |  2 ++
 2 files changed, 30 insertions(+)

diff --git a/tools/lib/traceevent/kbuffer-parse.c b/tools/lib/traceevent/kbuffer-parse.c
index 27f3b07fdae8..583db99aee94 100644
--- a/tools/lib/traceevent/kbuffer-parse.c
+++ b/tools/lib/traceevent/kbuffer-parse.c
@@ -546,6 +546,34 @@ int kbuffer_load_subbuffer(struct kbuffer *kbuf, void *subbuffer)
 	return 0;
 }
 
+/**
+ * kbuffer_subbuf_timestamp - read the timestamp from a sub buffer
+ * @kbuf:      The kbuffer to load
+ * @subbuf:    The subbuffer to read from.
+ *
+ * Return the timestamp from a subbuffer.
+ */
+unsigned long long kbuffer_subbuf_timestamp(struct kbuffer *kbuf, void *subbuf)
+{
+	return kbuf->read_8(subbuf);
+}
+
+/**
+ * kbuffer_ptr_delta - read the delta field from a record
+ * @kbuf:      The kbuffer to load
+ * @ptr:       The record in the buffe.
+ *
+ * Return the timestamp delta from a record
+ */
+unsigned int kbuffer_ptr_delta(struct kbuffer *kbuf, void *ptr)
+{
+	unsigned int type_len_ts;
+
+	type_len_ts = read_4(kbuf, ptr);
+	return ts4host(kbuf, type_len_ts);
+}
+
+
 /**
  * kbuffer_read_event - read the next event in the kbuffer subbuffer
  * @kbuf:	The kbuffer to read from
diff --git a/tools/lib/traceevent/kbuffer.h b/tools/lib/traceevent/kbuffer.h
index ed4d697fc137..5fa8292e341b 100644
--- a/tools/lib/traceevent/kbuffer.h
+++ b/tools/lib/traceevent/kbuffer.h
@@ -49,6 +49,8 @@ int kbuffer_load_subbuffer(struct kbuffer *kbuf, void *subbuffer);
 void *kbuffer_read_event(struct kbuffer *kbuf, unsigned long long *ts);
 void *kbuffer_next_event(struct kbuffer *kbuf, unsigned long long *ts);
 unsigned long long kbuffer_timestamp(struct kbuffer *kbuf);
+unsigned long long kbuffer_subbuf_timestamp(struct kbuffer *kbuf, void *subbuf);
+unsigned int kbuffer_ptr_delta(struct kbuffer *kbuf, void *ptr);
 
 void *kbuffer_translate_data(int swap, void *data, unsigned int *size);
 
-- 
2.26.2



  reply	other threads:[~2020-07-02 17:12 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-02 17:10 [PATCH 0/9] tools lib traceevent: Patches from the trace-cmd repo Steven Rostedt
2020-07-02 17:10 ` Steven Rostedt [this message]
2020-07-02 17:10 ` [PATCH 2/9] tools lib traceevent: Add proper KBUFFER_TYPE_TIME_STAMP handling Steven Rostedt
2020-07-02 17:10 ` [PATCH 3/9] tools lib traceevent: Add tep_load_plugins_hook() API Steven Rostedt
2020-07-02 17:10 ` [PATCH 4/9] tools lib traceevent: Add interface for options to plugins Steven Rostedt
2020-07-02 17:10 ` [PATCH 5/9] tools lib traceevent: Introduced new traceevent API, for adding new plugins directories Steven Rostedt
2020-07-02 17:10 ` [PATCH 6/9] tools lib traceevent: Add support for more printk format specifiers Steven Rostedt
2020-07-02 17:10 ` [PATCH 7/9] tools lib traceevent: Optimize pretty_print() function Steven Rostedt
2020-07-02 17:10 ` [PATCH 8/9] tools lib traceevent: Add plugin for tlb_flush Steven Rostedt
2020-07-02 17:10 ` [PATCH 9/9] tools lib traceevent: Add more SVM exit reasons Steven Rostedt

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