Re: [PATCH 02/10] perf tools: Add perf_data_file__switch() helper

[Jiri Olsa <jolsa@redhat.com>]

On Wed, Apr 13, 2016 at 08:21:05AM +0000, Wang Nan wrote:
> perf_data_file__switch() closes current output file, renames it, then
> open a new one to continue recording. It will be used by perf record
> to split output into multiple perf.data files.
> 
> 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/util/data.c | 41 +++++++++++++++++++++++++++++++++++++++++
>  tools/perf/util/data.h | 11 ++++++++++-
>  2 files changed, 51 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> index 1921942..be835161 100644
> --- a/tools/perf/util/data.c
> +++ b/tools/perf/util/data.c
> @@ -136,3 +136,44 @@ ssize_t perf_data_file__write(struct perf_data_file *file,
>  {
>  	return writen(file->fd, buf, size);
>  }
> +
> +int perf_data_file__switch(struct perf_data_file *file,
> +			   const char *postfix,
> +			   size_t pos, bool at_exit)

could you please rename at_exit to reopen

I guess you follow the record object's at_exit naming,
but 'reopen' seems more clear to me

jirka