linux-kernel - Re: [PATCH v2 4/4] Make all print functions receive the fp argument, and opens a dump file in process

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Date:   Tue, 3 Oct 2017 12:43:19 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     yuzhoujian <ufo19890607@...il.com>
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        dsahern@...il.com, namhyung@...nel.org, milian.wolff@...b.com,
        arnaldo.melo@...il.com, yuzhoujian@...ichuxing.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] Make all print functions receive the fp argument,
 and opens a dump file in process_event.

On Tue, Sep 26, 2017 at 02:53:17PM +0800, yuzhoujian wrote:

SNIP

> -	perf_event__fprintf(event, stdout);
> +	fp = tool->per_event_dump ? per_event_dump_file : stdout;
> +	fprint_sample_start(sample, thread, evsel, fp);
> +	perf_event__fprintf(event, fp);
>  	thread__put(thread);
>  	return 0;
>  }
> @@ -2852,6 +2883,8 @@ int cmd_script(int argc, const char **argv)
>  	file.path = input_name;
>  	file.force = symbol_conf.force;
>  
> +	file_name = file.path ? file.path : "perf.data";

you don't need file_name variable, the data file name is
reachable from struct perf_script:

  perf_script::session::file

jirka