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[01/23,v3] tools lib traceevent: Add API to read time information from kbuffer

Message ID 20200722011752.413388509@goodmis.org (mailing list archive)
State Accepted
Commit 374855c5e4a76f7cc7f9aeb613c54929510eff18
Headers show
Series tools lib traceevent: Synchronizing trace-cmd with tools | expand

Commit Message

Steven Rostedt July 22, 2020, 1:16 a.m. UTC 
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>
[ Ported from trace-cmd.git ]
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 mbox series

Patch

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);