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[PATCH 08/10] perf record: Re-synthesize tracking events after output switching

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Tracking events describe kernel and threads. They are generated by
reading /proc/kallsyms, /proc/*/maps and /proc/*/task/* during
initialization of 'perf record', serialized into event sequences and put
at the head of 'perf.data'. In case of output switching, each output
file should contain those events.

This patch calls record__synthesize() during output switching, so the
event sequences described above can be collected again.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: He Kuang <hekuang@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
 tools/perf/builtin-record.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 714d79d..eedc50a 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -534,6 +534,8 @@ record__finish_output(struct record *rec)
 	return;
 }
 
+static int record__synthesize(struct record *rec);
+
 static int
 record__switch_output(struct record *rec, bool at_exit)
 {
@@ -562,6 +564,11 @@ record__switch_output(struct record *rec, bool at_exit)
 	if (!quiet)
 		fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
 			file->path, timestamp);
+
+	/* Output tracking events */
+	if (!at_exit)
+		record__synthesize(rec);
+
 	return fd;
 }
 
-- 
1.8.3.4

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[PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping Wang Nan <wangnan0@huawei.com> - 2016-04-13 10:30 +0200
  [PATCH 08/10] perf record: Re-synthesize tracking events after output switching Wang Nan <wangnan0@huawei.com> - 2016-04-13 10:30 +0200
  [PATCH 04/10] perf record: Add '--timestamp-filename' option to append timestamp to output filename Wang Nan <wangnan0@huawei.com> - 2016-04-13 10:30 +0200
    [tip:perf/core] perf record: Add '--timestamp-filename' option to  append timestamp to output file name tip-bot for Wang Nan <tipbot@zytor.com> - 2016-04-14 15:40 +0200
  [PATCH 10/10] perf core: Add backward attribute to perf event Wang Nan <wangnan0@huawei.com> - 2016-04-13 10:30 +0200
  [PATCH 02/10] perf tools: Add perf_data_file__switch() helper Wang Nan <wangnan0@huawei.com> - 2016-04-13 10:30 +0200
    [tip:perf/core] perf data: Add perf_data_file__switch() helper tip-bot for Wang Nan <tipbot@zytor.com> - 2016-04-14 15:40 +0200
    Re: [PATCH 02/10] perf tools: Add perf_data_file__switch() helper Jiri Olsa <jolsa@redhat.com> - 2016-04-15 13:00 +0200
      Re: [PATCH 02/10] perf tools: Add perf_data_file__switch() helper Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-04-15 18:10 +0200
  [PATCH 09/10] perf record: Generate tracking events for process forked by perf Wang Nan <wangnan0@huawei.com> - 2016-04-13 10:30 +0200
  [PATCH 05/10] perf record: Split output into multiple files via '--switch-output' Wang Nan <wangnan0@huawei.com> - 2016-04-13 10:30 +0200
  Re: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-04-13 19:20 +0200
  Re: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping "Wangnan (F)" <wangnan0@huawei.com> - 2016-04-15 12:50 +0200
    Re: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping "Wangnan (F)" <wangnan0@huawei.com> - 2016-04-15 13:50 +0200
      Re: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-04-15 15:10 +0200
        Re: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-04-15 18:30 +0200
  Re: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping Jiri Olsa <jolsa@redhat.com> - 2016-04-15 12:50 +0200

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