linux-kernel - Re: [PATCH v3 3/3] perf annotate: Fix missing number of samples

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Message-ID: <20170327182631.GC27431@kernel.org>
Date:   Mon, 27 Mar 2017 15:26:31 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Taeung Song <treeze.taeung@...il.com>
Cc:     linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Martin Liška <mliska@...e.cz>
Subject: Re: [PATCH v3 3/3] perf annotate: Fix missing number of samples

Em Mon, Mar 27, 2017 at 04:10:38PM +0900, Taeung Song escreveu:
> If running 'perf annotate --stdio -l --show-total-period',
> you can see a problem showing only zero '0' for number of samples.
> 
> Before:
>     $ perf annotate --stdio -l --show-total-period
> ...
>        0 :        400816:       push   %rbp
>        0 :        400817:       mov    %rsp,%rbp
>        0 :        40081a:       mov    %edi,-0x24(%rbp)
>        0 :        40081d:       mov    %rsi,-0x30(%rbp)
>        0 :        400821:       mov    -0x24(%rbp),%eax
>        0 :        400824:       mov    -0x30(%rbp),%rdx
>        0 :        400828:       mov    (%rdx),%esi
>        0 :        40082a:       mov    $0x0,%edx
> ...
> 
> The reason is number of samples aren't set
> in symbol__get_source_line(). so set it ordinarily.

Can you please take a look at:

  0c4a5bcea460 ("perf annotate: Display total number of samples with --show-total-period")

that introduced the --show-total-period code and take it into account in
this fix?

I.e. from a quick look it did the calculation setting that field in the
TUI code, where it should have done in the util/annotate.c file, so that
all UIs would be able to use it.

After your analysis, please add a Fixes: that cset, ok?

I applied the other two patches and added Martin to the CC list, as he
is the author of that patch and may have something to say here.

- Arnaldo

 
> After:
>     $ perf annotate --stdio -l --show-total-period
> ...
>        3 :        400816:       push   %rbp
>        4 :        400817:       mov    %rsp,%rbp
>        0 :        40081a:       mov    %edi,-0x24(%rbp)
>        0 :        40081d:       mov    %rsi,-0x30(%rbp)
>        1 :        400821:       mov    -0x24(%rbp),%eax
>        2 :        400824:       mov    -0x30(%rbp),%rdx
>        0 :        400828:       mov    (%rdx),%esi
>        1 :        40082a:       mov    $0x0,%edx
> ...
> 
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
> ---
>  tools/perf/util/annotate.c | 6 ++++--
>  tools/perf/util/annotate.h | 2 +-
>  2 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 11af5f0..a37032b 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -1665,7 +1665,7 @@ static int symbol__get_source_line(struct symbol *sym, struct map *map,
>  	start = map__rip_2objdump(map, sym->start);
>  
>  	for (i = 0; i < len; i++) {
> -		u64 offset;
> +		u64 offset, nr_samples;
>  		double percent_max = 0.0;
>  
>  		src_line->nr_pcnt = nr_pcnt;
> @@ -1674,12 +1674,14 @@ static int symbol__get_source_line(struct symbol *sym, struct map *map,
>  			double percent = 0.0;
>  
>  			h = annotation__histogram(notes, evidx + k);
> +			nr_samples = h->addr[i];
>  			if (h->sum)
> -				percent = 100.0 * h->addr[i] / h->sum;
> +				percent = 100.0 * nr_samples / h->sum;
>  
>  			if (percent > percent_max)
>  				percent_max = percent;
>  			src_line->samples[k].percent = percent;
> +			src_line->samples[k].nr = nr_samples;
>  		}
>  
>  		if (percent_max <= 0.5)
> diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h
> index 09776b5..948aa8e 100644
> --- a/tools/perf/util/annotate.h
> +++ b/tools/perf/util/annotate.h
> @@ -98,7 +98,7 @@ struct cyc_hist {
>  struct source_line_samples {
>  	double		percent;
>  	double		percent_sum;
> -	double          nr;
> +	u64		nr;
>  };
>  
>  struct source_line {
> -- 
> 2.7.4