linux-kernel - Re: [PATCH v12 3/3]: perf record: extend trace writing to multi AIO

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Date:   Thu, 11 Oct 2018 15:45:59 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v12 3/3]: perf record: extend trace writing to multi AIO

On Tue, Oct 09, 2018 at 11:59:31AM +0300, Alexey Budankov wrote:

SNIP

> @@ -1568,15 +1596,18 @@ static int parse_clockid(const struct option *opt, const char *str, int unset)
>  
>  #ifdef HAVE_AIO_SUPPORT
>  static int record__aio_parse(const struct option *opt,
> -			     const char *str __maybe_unused,
> +			     const char *str,
>  			     int unset)
>  {
>  	struct record_opts *opts = (struct record_opts *)opt->value;
>  
> -	if (unset)
> +	if (unset) {
>  		opts->nr_cblocks = 0;
> -	else
> -		opts->nr_cblocks = 1;
> +	} else {
> +		opts->nr_cblocks = strtol(str, NULL, 0);
> +		if (!opts->nr_cblocks)
> +			opts->nr_cblocks = 1;
> +	}
>  
>  	return 0;
>  }
> @@ -1886,8 +1917,8 @@ static struct option __record_options[] = {
>  	OPT_BOOLEAN(0, "dry-run", &dry_run,
>  		    "Parse options then exit"),
>  #ifdef HAVE_AIO_SUPPORT
> -	OPT_CALLBACK_NOOPT(0, "aio", &record.opts,
> -		     NULL, "Enable asynchronous trace writing mode",

hum, why removing --aio option? I though we will have:

  perf record --aio ....           # enables aio with default settings
  perf record --aio-cblocks=3 ...  # enabled aio with aio-cblocks=3


jirka

> +	OPT_CALLBACK(0, "aio-cblocks", &record.opts,
> +		     "n", "Use <n> control blocks in asynchronous trace writing mode (max: 4)",
>  		     record__aio_parse),

SNIP