[PATCH v2 3/6] perf record: Force enable --timestamp-filename when --switch-output is provided

[Wang Nan <wangnan0@huawei.com>]

Without this patch, the last output doesn't have timestamp appended if
--timestamp-filename is not explicitly provided. For example:

 # perf record -a --switch-output &
 [1] 11224
 # kill -s SIGUSR2 11224
 [ perf record: dump data: Woken up 1 times ]
 # [ perf record: Dump perf.data.2015122622372823 ]

 # fg
 perf record -a --switch-output
 ^C[ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 0.027 MB perf.data (540 samples) ]

 # ls -l
 total 836
 -rw------- 1 root root  33256 Dec 26 22:37 perf.data   <---- *Odd*
 -rw------- 1 root root 817156 Dec 26 22:37 perf.data.2015122622372823

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: Adrian Hunter <adrian.hunter@intel.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 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index ca40726..32db7a7 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1338,6 +1338,9 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
 		return -EINVAL;
 	}
 
+	if (rec->switch_output)
+		rec->timestamp_filename = true;
+
 	if (!rec->itr) {
 		rec->itr = auxtrace_record__init(rec->evlist, &err);
 		if (err)
-- 
1.8.3.4