linux-kernel - Re: [PATCH 1/6] perf script: Enhance sample flags for trace begin / end

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Date:   Wed, 19 Sep 2018 15:45:56 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] perf script: Enhance sample flags for trace begin /
 end

Em Wed, Sep 19, 2018 at 02:23:33PM +0300, Adrian Hunter escreveu:
> Allow for different combinations of sample flags with "trace begin" or
> "trace end".

Please describe how you would use this with some command and its output.

- Arnaldo
 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/builtin-script.c | 36 +++++++++++++++++++++++++++---------
>  1 file changed, 27 insertions(+), 9 deletions(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 6176bae177c2..4982380ba96d 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -1255,6 +1255,18 @@ static struct {
>  	{0, NULL}
>  };
>  
> +static const char *sample_flags_to_name(u32 flags)
> +{
> +	int i;
> +
> +	for (i = 0; sample_flags[i].name ; i++) {
> +		if (sample_flags[i].flags == flags)
> +			return sample_flags[i].name;
> +	}
> +
> +	return NULL;
> +}
> +
>  static int perf_sample__fprintf_flags(u32 flags, FILE *fp)
>  {
>  	const char *chars = PERF_IP_FLAG_CHARS;
> @@ -1264,11 +1276,20 @@ static int perf_sample__fprintf_flags(u32 flags, FILE *fp)
>  	char str[33];
>  	int i, pos = 0;
>  
> -	for (i = 0; sample_flags[i].name ; i++) {
> -		if (sample_flags[i].flags == (flags & ~PERF_IP_FLAG_IN_TX)) {
> -			name = sample_flags[i].name;
> -			break;
> -		}
> +	name = sample_flags_to_name(flags & ~PERF_IP_FLAG_IN_TX);
> +	if (name)
> +		return fprintf(fp, "  %-15s%4s ", name, in_tx ? "(x)" : "");
> +
> +	if (flags & PERF_IP_FLAG_TRACE_BEGIN) {
> +		name = sample_flags_to_name(flags & ~(PERF_IP_FLAG_IN_TX | PERF_IP_FLAG_TRACE_BEGIN));
> +		if (name)
> +			return fprintf(fp, "  tr strt %-7s%4s ", name, in_tx ? "(x)" : "");
> +	}
> +
> +	if (flags & PERF_IP_FLAG_TRACE_END) {
> +		name = sample_flags_to_name(flags & ~(PERF_IP_FLAG_IN_TX | PERF_IP_FLAG_TRACE_END));
> +		if (name)
> +			return fprintf(fp, "  tr end  %-7s%4s ", name, in_tx ? "(x)" : "");
>  	}
>  
>  	for (i = 0; i < n; i++, flags >>= 1) {
> @@ -1281,10 +1302,7 @@ static int perf_sample__fprintf_flags(u32 flags, FILE *fp)
>  	}
>  	str[pos] = 0;
>  
> -	if (name)
> -		return fprintf(fp, "  %-7s%4s ", name, in_tx ? "(x)" : "");
> -
> -	return fprintf(fp, "  %-11s ", str);
> +	return fprintf(fp, "  %-19s ", str);
>  }
>  
>  struct printer_data {
> -- 
> 2.17.1