linux-kernel - Re: [RFC PATCH v8 2/7] perf data: Allow to use given fd in data->file.fd

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Date: Thu, 16 May 2024 09:11:15 -0700
From: Ian Rogers <irogers@...gle.com>
To: weilin.wang@...el.com
Cc: Namhyung Kim <namhyung@...nel.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Perry Taylor <perry.taylor@...el.com>, Samantha Alt <samantha.alt@...el.com>, 
	Caleb Biggers <caleb.biggers@...el.com>
Subject: Re: [RFC PATCH v8 2/7] perf data: Allow to use given fd in data->file.fd

On Tue, May 14, 2024 at 10:44 PM <weilin.wang@...el.com> wrote:
>
> From: Weilin Wang <weilin.wang@...el.com>
>
> When in PIPE mode, allow to use fd dynamically opened and asigned to
> data->file.fd instead of STDIN_FILENO or STDOUT_FILENO.
>
> Signed-off-by: Weilin Wang <weilin.wang@...el.com>

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/perf/util/data.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> index 08c4bfbd817f..98661ede2a73 100644
> --- a/tools/perf/util/data.c
> +++ b/tools/perf/util/data.c
> @@ -204,7 +204,12 @@ static bool check_pipe(struct perf_data *data)
>                                 data->file.fd = fd;
>                                 data->use_stdio = false;
>                         }
> -               } else {
> +
> +               /*
> +                * When is_pipe and data->file.fd is given, use given fd
> +                * instead of STDIN_FILENO or STDOUT_FILENO
> +                */
> +               } else if (data->file.fd <= 0) {
>                         data->file.fd = fd;
>                 }
>         }
> --
> 2.43.0
>