perf data: Add perf data to CTF conversion support

Adding 'perf data convert' to convert perf data file into different
format. This patch adds support for CTF format conversion.

To convert perf.data into CTF run:
  $ perf data convert --to-ctf=./ctf-data/
  [ perf data convert: Converted 'perf.data' into CTF data './ctf-data/' ]
  [ perf data convert: Converted and wrote 11.268 MB (100230 samples) ]

The command will create CTF metadata out of perf.data file (or one
specified via -i option) and then convert all sample events into single
CTF stream.

Each sample_type bit is translated into separated CTF event field apart
from following exceptions:

  PERF_SAMPLE_RAW          - added in next patch
  PERF_SAMPLE_READ         - TODO
  PERF_SAMPLE_CALLCHAIN    - TODO
  PERF_SAMPLE_BRANCH_STACK - TODO
  PERF_SAMPLE_REGS_USER    - TODO
  PERF_SAMPLE_STACK_USER   - TODO

  $ perf --debug=data-convert=2 data convert ...

The converted CTF data could be analyzed by CTF tools, like babletrace
or tracecompass [1].

  $ babeltrace ./ctf-data/
  [03:19:13.962125533] (+?.?????????) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 1 }
  [03:19:13.962130001] (+0.000004468) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 1 }
  [03:19:13.962131936] (+0.000001935) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 8 }
  [03:19:13.962133732] (+0.000001796) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 114 }
  [03:19:13.962135557] (+0.000001825) cycles: { }, { ip = 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 2087 }
  [03:19:13.962137627] (+0.000002070) cycles: { }, { ip = 0xFFFFFFFF81361938, tid = 20714, pid = 20714, period = 37582 }
  [03:19:13.962161091] (+0.000023464) cycles: { }, { ip = 0xFFFFFFFF8124218F, tid = 20714, pid = 20714, period = 600246 }
  [03:19:13.962517569] (+0.000356478) cycles: { }, { ip = 0xFFFFFFFF811A75DB, tid = 20714, pid = 20714, period = 1325731 }
  [03:19:13.969518008] (+0.007000439) cycles: { }, { ip = 0x34080917B2, tid = 20714, pid = 20714, period = 1144298 }

The following members to the ctf-environment were decided to be added to
distinguish and specify perf CTF data:

  - domain

    It says "kernel" because it contains a kernel trace (not to be
    confused with a user space like lttng-ust does)

  - tracer_name

    It says perf. This can be used to distinguish between lttng and perf
    CTF based trace.

  - version

    The kernel version from stream. In addition to release, this is what
    it looks like on a Debian kernel:

      release = "3.14-1-amd64";
      version = "3.14.0";

[1] http://projects.eclipse.org/projects/tools.tracecompassSigned-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: David Ahern <dsahern@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jeremie Galarneau <jgalar@efficios.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1424470628-5969-4-git-send-email-jolsa@kernel.orgSigned-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-data.txt

@@ -13,3 +13,28 @@ SYNOPSIS
 DESCRIPTION
 -----------
 Data file related processing.
+
+COMMANDS
+--------
+convert::
+	Converts perf data file into another format (only CTF [1] format is support by now).
+	It's possible to set data-convert debug variable to get debug messages from conversion,
+	like:
+	  perf --debug data-convert data convert ...
+
+OPTIONS for 'convert'
+---------------------
+--to-ctf::
+	Triggers the CTF conversion, specify the path of CTF data directory.
+
+-i::
+	Specify input perf data file path.
+
+-v::
+--verbose::
+        Be more verbose (show counter open errors, etc).
+
+SEE ALSO
+--------
+linkperf:perf[1]
+[1] Common Trace Format - http://www.efficios.com/ctf

tools/perf/Documentation/perf.txt

@@ -13,11 +13,16 @@ SYNOPSIS
 OPTIONS
 -------
 --debug::
-	Setup debug variable (just verbose for now) in value
+	Setup debug variable (see list below) in value
 	range (0, 10). Use like:
 	  --debug verbose   # sets verbose = 1
 	  --debug verbose=2 # sets verbose = 2
 
+	List of debug variables allowed to set:
+	  verbose          - general debug messages
+	  ordered-events   - ordered events object debug messages
+	  data-convert     - data convert command debug messages
+
 --buildid-dir::
 	Setup buildid cache directory. It has higher priority than
 	buildid.dir config file option.

tools/perf/builtin-data.c

@@ -3,6 +3,7 @@
 #include "perf.h"
 #include "debug.h"
 #include "parse-options.h"
+#include "data-convert-bt.h"
 
 typedef int (*data_cmd_fn_t)(int argc, const char **argv, const char *prefix);
 
@@ -41,7 +42,50 @@ static void print_usage(void)
 	printf("\n");
 }
 
+static const char * const data_convert_usage[] = {
+	"perf data convert [<options>]",
+	NULL
+};
+
+static int cmd_data_convert(int argc, const char **argv,
+			    const char *prefix __maybe_unused)
+{
+	const char *to_ctf     = NULL;
+	const struct option options[] = {
+		OPT_INCR('v', "verbose", &verbose, "be more verbose"),
+		OPT_STRING('i', "input", &input_name, "file", "input file name"),
+#ifdef HAVE_LIBBABELTRACE_SUPPORT
+		OPT_STRING(0, "to-ctf", &to_ctf, NULL, "Convert to CTF format"),
+#endif
+		OPT_END()
+	};
+
+#ifndef HAVE_LIBBABELTRACE_SUPPORT
+	pr_err("No conversion support compiled in.\n");
+	return -1;
+#endif
+
+	argc = parse_options(argc, argv, options,
+			     data_convert_usage, 0);
+	if (argc) {
+		usage_with_options(data_convert_usage, options);
+		return -1;
+	}
+
+	if (to_ctf) {
+#ifdef HAVE_LIBBABELTRACE_SUPPORT
+		return bt_convert__perf2ctf(input_name, to_ctf);
+#else
+		pr_err("The libbabeltrace support is not compiled in.\n");
+		return -1;
+#endif
+	}
+
+	return 0;
+}
+
 static struct data_cmd data_cmds[] = {
+	{ "convert", "converts data file between formats", cmd_data_convert },
 	{ NULL },
 };
 

tools/perf/config/Makefile

@@ -713,6 +713,7 @@ ifndef NO_LIBBABELTRACE
     CFLAGS += -DHAVE_LIBBABELTRACE_SUPPORT $(LIBBABELTRACE_CFLAGS)
     LDFLAGS += $(LIBBABELTRACE_LDFLAGS)
     EXTLIBS += -lbabeltrace-ctf
+    $(call detected,CONFIG_LIBBABELTRACE)
   endif
 endif
 

tools/perf/util/Build

@@ -88,6 +88,8 @@ libperf-$(CONFIG_DWARF) += dwarf-aux.o
 libperf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
 libperf-$(CONFIG_LIBUNWIND)          += unwind-libunwind.o
 
+libperf-$(CONFIG_LIBBABELTRACE) += data-convert-bt.o
+
 libperf-y += scripting-engines/
 
 libperf-$(CONFIG_PERF_REGS) += perf_regs.o

tools/perf/util/data-convert-bt.h

+#ifndef __DATA_CONVERT_BT_H
+#define __DATA_CONVERT_BT_H
+#ifdef HAVE_LIBBABELTRACE_SUPPORT
+
+int bt_convert__perf2ctf(const char *input_name, const char *to_ctf);
+
+#endif /* HAVE_LIBBABELTRACE_SUPPORT */
+#endif /* __DATA_CONVERT_BT_H */

tools/perf/util/debug.c

@@ -20,6 +20,7 @@ int verbose;
 bool dump_trace = false, quiet = false;
 int debug_ordered_events;
 static int redirect_to_stderr;
+int debug_data_convert;
 
 static int _eprintf(int level, int var, const char *fmt, va_list args)
 {
@@ -147,6 +148,7 @@ static struct debug_variable {
 	{ .name = "verbose",		.ptr = &verbose },
 	{ .name = "ordered-events",	.ptr = &debug_ordered_events},
 	{ .name = "stderr",		.ptr = &redirect_to_stderr},
+	{ .name = "data-convert",	.ptr = &debug_data_convert },
 	{ .name = NULL, }
 };
 

tools/perf/util/debug.h

@@ -12,6 +12,7 @@
 extern int verbose;
 extern bool quiet, dump_trace;
 extern int debug_ordered_events;
+extern int debug_data_convert;
 
 #ifndef pr_fmt
 #define pr_fmt(fmt) fmt