linux-kernel - Re: [PATCH] perf annotate: improve --stdio mode

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Date:   Thu, 8 Apr 2021 12:08:30 +0200
From:   Martin Liška <mliska@...e.cz>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf annotate: improve --stdio mode

On 4/7/21 10:25 PM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Apr 07, 2021 at 04:30:46PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Fri, Feb 26, 2021 at 10:24:00AM +0100, Martin Liška escreveu:
>>> On 2/23/21 8:47 PM, Arnaldo Carvalho de Melo wrote:
>>> Sure. But I think the current format provides quite broken visual layout:
>>>
>>>       0.00 :   405ef1: inc    %r15
>>>       0.01 :   405ef4: vfmadd213sd 0x2b9b3(%rip),%xmm0,%xmm3        # 4318b0 <_IO_stdin_used+0x8b0>
>>>    eff.c:1811    0.67 :   405efd: vfmadd213sd 0x2b9b2(%rip),%xmm0,%xmm3        # 4318b8 <_IO_stdin_used+0x8b8>
>>>           :            TA + tmpsd * (TB +
>>>
>>> vs.
>>>
>>>       0.00 :   405ef1: inc    %r15
>>>       0.01 :   405ef4: vfmadd213sd 0x2b9b3(%rip),%xmm0,%xmm3        # 4318b0 <_IO_stdin_used+0x8b0>
>>>       0.67 :   405efd: vfmadd213sd 0x2b9b2(%rip),%xmm0,%xmm3        # 4318b8 <_IO_stdin_used+0x8b8> // eff.c:1811
>>>            : 1810   TA + tmpsd * (TB +
>>>
>>> I bet also the current users of --stdio mode would benefit from it.
>>> What do you think?
>  
>> Agreed, I tried applying but it bitrotted, it seems :-\
> 
> I refreshed it, please check.

Thanks! I've just tested the patch on top of acme/perf/core and it works as was planned.
I'm attaching 2 perf annotate snippets (perf annotate --stdio -l --stdio-color=always) before
and after the revision:

https://splichal.eu/tmp/perf-before.html
https://splichal.eu/tmp/perf-after.html

I hope it nicely describes that it's an improvement.

Cheers,
Martin

> 
> - Arnaldo
> 
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 18eee25b4976bea8..abe1499a91645375 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -1368,7 +1368,6 @@ annotation_line__print(struct annotation_line *al, struct symbol *sym, u64 start
>  {
>  	struct disasm_line *dl = container_of(al, struct disasm_line, al);
>  	static const char *prev_line;
> -	static const char *prev_color;
>  
>  	if (al->offset != -1) {
>  		double max_percent = 0.0;
> @@ -1407,20 +1406,6 @@ annotation_line__print(struct annotation_line *al, struct symbol *sym, u64 start
>  
>  		color = get_percent_color(max_percent);
>  
> -		/*
> -		 * Also color the filename and line if needed, with
> -		 * the same color than the percentage. Don't print it
> -		 * twice for close colored addr with the same filename:line
> -		 */
> -		if (al->path) {
> -			if (!prev_line || strcmp(prev_line, al->path)
> -				       || color != prev_color) {
> -				color_fprintf(stdout, color, " %s", al->path);
> -				prev_line = al->path;
> -				prev_color = color;
> -			}
> -		}
> -
>  		for (i = 0; i < nr_percent; i++) {
>  			struct annotation_data *data = &al->data[i];
>  			double percent;
> @@ -1441,6 +1426,19 @@ annotation_line__print(struct annotation_line *al, struct symbol *sym, u64 start
>  		printf(" : ");
>  
>  		disasm_line__print(dl, start, addr_fmt_width);
> +
> +		/*
> +		 * Also color the filename and line if needed, with
> +		 * the same color than the percentage. Don't print it
> +		 * twice for close colored addr with the same filename:line
> +		 */
> +		if (al->path) {
> +			if (!prev_line || strcmp(prev_line, al->path)) {
> +				color_fprintf(stdout, color, " // %s", al->path);
> +				prev_line = al->path;
> +			}
> +		}
> +
>  		printf("\n");
>  	} else if (max_lines && printed >= max_lines)
>  		return 1;
> @@ -1456,7 +1454,7 @@ annotation_line__print(struct annotation_line *al, struct symbol *sym, u64 start
>  		if (!*al->line)
>  			printf(" %*s:\n", width, " ");
>  		else
> -			printf(" %*s:     %*s %s\n", width, " ", addr_fmt_width, " ", al->line);
> +			printf(" %*s: %-*d %s\n", width, " ", addr_fmt_width, al->line_nr, al->line);
>  	}
>  
>  	return 0;
>