linux-kernel - Re: [PATCH v4 5/5] perf report: Show branch type in callchain entry

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Date:   Tue, 18 Apr 2017 20:53:23 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4 5/5] perf report: Show branch type in callchain entry

On Wed, Apr 12, 2017 at 06:21:06AM +0800, Jin Yao wrote:

SNIP

>  static int counts_str_build(char *bf, int bfsize,
>  			     u64 branch_count, u64 predicted_count,
>  			     u64 abort_count, u64 cycles_count,
> -			     u64 iter_count, u64 samples_count)
> +			     u64 iter_count, u64 samples_count,
> +			     struct branch_type_stat *brtype_stat)
>  {
> -	double predicted_percent = 0.0;
> -	const char *null_str = "";
> -	char iter_str[32];
> -	char cycle_str[32];
> -	char *istr, *cstr;
>  	u64 cycles;
> +	int printed, i = 0;
>  
>  	if (branch_count == 0)
>  		return scnprintf(bf, bfsize, " (calltrace)");
>  
> +	printed = branch_type_str(brtype_stat, bf, bfsize);
> +	if (printed)
> +		i++;
> +
>  	cycles = cycles_count / branch_count;
> +	if (cycles) {
> +		if (i++)
> +			printed += scnprintf(bf + printed, bfsize - printed,
> +				" cycles:%" PRId64 "", cycles);
> +		else
> +			printed += scnprintf(bf + printed, bfsize - printed,
> +				" (cycles:%" PRId64 "", cycles);
> +	}
>  
>  	if (iter_count && samples_count) {
> -		if (cycles > 0)
> -			scnprintf(iter_str, sizeof(iter_str),
> -				 " iterations:%" PRId64 "",
> -				 iter_count / samples_count);
> +		if (i++)
> +			printed += scnprintf(bf + printed, bfsize - printed,
> +				" iterations:%" PRId64 "",
> +				iter_count / samples_count);
>  		else
> -			scnprintf(iter_str, sizeof(iter_str),
> -				 "iterations:%" PRId64 "",
> -				 iter_count / samples_count);
> -		istr = iter_str;

could you please put the change from using iter_str
to bf into separate patch before the actual branch
display change?

it's hard to see if anything is broken ;-)

thanks,
jirka