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SubjectRe: [PATCH core] perf data: Adding error message if perf_data__create_dir fails
On Fri, Feb 18, 2022 at 06:23:40PM +0300, Alexey Bayduraev wrote:
> There is no notification about data directory creation failure. Add it.
>
> Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
> ---
> tools/perf/builtin-record.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 0bc6529814b2..0306d5911de2 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1186,8 +1186,10 @@ static int record__mmap_evlist(struct record *rec,
>
> if (record__threads_enabled(rec)) {
> ret = perf_data__create_dir(&rec->data, evlist->core.nr_mmaps);
> - if (ret)
> + if (ret) {
> + pr_err("Failed to create data directory: %s\n", strerror(errno));

errno will be misleading in here, because perf_data__create_dir
calls other syscalls on error path

jirka

> return ret;
> + }
> for (i = 0; i < evlist->core.nr_mmaps; i++) {
> if (evlist->mmap)
> evlist->mmap[i].file = &rec->data.dir.files[i];
> --
> 2.19.0
>

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