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Date: Thu, 17 Dec 2009 10:29:12 -0800
From: Darren Hart <dvhltc@...ibm.com>
To: Steven Rostedt <rostedt@...dmis.org>,
"lkml, " <linux-kernel@...r.kernel.org>
Subject: [PATCH V3] tracecmd: Start of a tracecmd swig wrapper for python
>From e284c90944b6362bc9dd0b3f53a35ece66590d97 Mon Sep 17 00:00:00 2001
From: Darren Hart <dvhltc@...ibm.com>
Date: Wed, 16 Dec 2009 15:25:30 -0800
Subject: [PATCH V3] tracecmd: Start of a tracecmd swig wrapper for python
Introduce a python ctracecmd module for use in rapidly prototyping
tracing applications. The interface description is provided in
ctracecmd.i, it identifies which functions are available from within
python. A test python script is provided as tracecmd-test.py.
These bindings are expected to change significantly. Eventually I
would like to wrap this automated binding with more pythonic objects,
most likely including Trace and Event objects which merge the
functionality of tracecmd-input, pevent, record, and event structures.
This will make development of python apps much more accessible to many
application developers.
For now, this is mostly a proof of concept and is no where near
complete. It can however open a trace file and read all the events from
it, displaying them by CPU in chronological order.
V2: o Simplified interface file with SWIG ifdefs in the header files
V3: o Move attribute removal to interface file
o Remove proxy classes and rename module to ctracecmd
o Use the Makefile with a phony python target instead of swig.sh
Signed-off-by: Darren Hart <dvhltc@...ibm.com>
---
Makefile | 10 +++++++++-
ctracecmd.i | 17 +++++++++++++++++
parse-events.h | 2 --
trace-cmd.h | 2 ++
tracecmd-test.py | 36 ++++++++++++++++++++++++++++++++++++
5 files changed, 64 insertions(+), 3 deletions(-)
create mode 100644 ctracecmd.i
create mode 100755 tracecmd-test.py
diff --git a/Makefile b/Makefile
index 42cb7ad..313ff99 100644
--- a/Makefile
+++ b/Makefile
@@ -83,6 +83,14 @@ plugin_mac80211.o: plugin_mac80211.c parse-events.h
plugin_mac80211.so: plugin_mac80211.o
$(CC) -shared -nostartfiles -o $@ $<
+
+.PHONY: python
+python: $(TCMD_LIB_OBJS) trace-cmd.o trace-read.o
+ swig -Wall -python -noproxy ctracecmd.i
+ gcc -fpic -c -I/usr/include/python2.6/ -I/usr/lib/python2.6/config ctracecmd_wrap.c
+ $(CC) --shared $^ ctracecmd_wrap.o -o ctracecmd.so
+
+
.PHONY: force
force:
@@ -90,4 +98,4 @@ TAGS: force
find . -name '*.[ch]' | xargs etags
clean:
- $(RM) *.o *~ $(TARGETS) *.a *.so
+ $(RM) *.o *~ $(TARGETS) *.a *.so ctracecmd_wrap.c
diff --git a/ctracecmd.i b/ctracecmd.i
new file mode 100644
index 0000000..80fface
--- /dev/null
+++ b/ctracecmd.i
@@ -0,0 +1,17 @@
+// tracecmd.i
+%module ctracecmd
+
+%{
+#include "trace-cmd.h"
+%}
+
+%inline %{
+%}
+
+/* SWIG can't grok these, define them to nothing */
+#define __trace
+#define __attribute__(x)
+#define __thread
+
+%include "trace-cmd.h"
+%include "parse-events.h"
diff --git a/parse-events.h b/parse-events.h
index e6f5806..9a2c608 100644
--- a/parse-events.h
+++ b/parse-events.h
@@ -275,8 +275,6 @@ struct pevent {
struct format_field *bprint_buf_field;
};
-void parse_set_info(struct pevent *pevent, int nr_cpus, int long_sz);
-
void die(char *fmt, ...);
void *malloc_or_die(unsigned int size);
void warning(char *fmt, ...);
diff --git a/trace-cmd.h b/trace-cmd.h
index 1c4d359..6f645c5 100644
--- a/trace-cmd.h
+++ b/trace-cmd.h
@@ -83,8 +83,10 @@ int tracecmd_set_cpu_to_timestamp(struct tracecmd_input *handle,
int tracecmd_ftrace_overrides(struct tracecmd_input *handle);
struct pevent *tracecmd_get_pevent(struct tracecmd_input *handle);
+#ifndef SWIG
/* hack for function graph work around */
extern __thread struct tracecmd_input *tracecmd_curr_thread_handle;
+#endif
/* --- Creating and Writing the trace.dat file --- */
diff --git a/tracecmd-test.py b/tracecmd-test.py
new file mode 100755
index 0000000..094ce81
--- /dev/null
+++ b/tracecmd-test.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+
+from ctracecmd import *
+
+# Let's move the following into a new Trace object constructor
+filename = "trace.dat"
+trace_file = open(filename)
+handle = tracecmd_open(trace_file.fileno())
+tracecmd_read_headers(handle)
+tracecmd_init_data(handle)
+
+# These should be members, i.e. Trace.cpus
+pe = tracecmd_get_pevent(handle)
+cpus = tracecmd_cpus(handle)
+print "Trace %s contains data for %d cpus" % (filename, cpus)
+
+# FIXME: this doesn't print anything...
+tracecmd_print_events(handle)
+
+print "Cycling through the events for each CPU"
+for cpu in range(0,cpus):
+ print "CPU", cpu
+ rec = tracecmd_read_data(handle, cpu)
+ while True:
+ if rec:
+ # these should be members of a Record object
+ pid = pevent_data_pid(pe, rec)
+ comm = pevent_data_comm_from_pid(pe, pid)
+ type = pevent_data_type(pe, rec)
+ event = pevent_data_event_from_type(pe, type)
+ print "\t%f %s: pid=%d comm=%s type=%d" % \
+ (record_ts_get(rec), event_name_get(event), pid, comm, type)
+
+ rec = tracecmd_read_data(handle, cpu)
+ else:
+ break
--
1.6.3.3
--
Darren Hart
IBM Linux Technology Center
Real-Time Linux Team
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