perf record: Fix perf.data size in no-buildid mode

The size of perf.data is missing update in no-buildid mode, which gives
wrong output result.

Before this patch:

  $ perf.perf record -B -e syscalls:sys_enter_open uname
  Linux
  [ perf record: Woken up 1 times to  write data ]
  [ perf record: Captured and wrote 0.000 MB perf.data ]

After this patch:

  $ perf.perf record -B -e syscalls:sys_enter_open uname
  Linux
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.001 MB perf.data ]

Signed-off-by: He Kuang <hekuang@huawei.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1432819050-30511-1-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 91aa2a3dcf19..d3731cce7c1c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -345,12 +345,9 @@ static int process_buildids(struct record *rec)
         struct perf_data_file *file  = &rec->file;
         struct perf_session *session = rec->session;
 
-        u64 size = lseek(perf_data_file__fd(file), 0, SEEK_CUR);
-        if (size == 0)
+        if (file->size == 0)
                 return 0;
 
-        file->size = size;
-
         /*
          * During this process, it'll load kernel map and replace the
          * dso->long_name to a real pathname it found.  In this case
@@ -719,6 +716,7 @@ out_child:
 
         if (!err && !file->is_pipe) {
                 rec->session->header.data_size += rec->bytes_written;
+                file->size = lseek(perf_data_file__fd(file), 0, SEEK_CUR);
 
                 if (!rec->no_buildid) {
                         process_buildids(rec);