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Date: Tue, 28 Mar 2017 23:21:33 +0900
From: Taeung Song <treeze.taeung@...il.com>
To: Arnaldo Carvalho de Melo <arnaldo.melo@...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 Liska <mliska@...e.cz>
Subject: Re: [PATCH v4] perf annotate: Fix missing number of samples for
source_line_samples
On 03/28/2017 10:48 PM, Arnaldo Carvalho de Melo wrote:
> Em Tue, Mar 28, 2017 at 09:12:05PM +0900, Taeung Song escreveu:
>> The option 'show-total-period' works fine without a option '-l'.
>> But if running 'perf annotate --stdio -l --show-total-period',
>> you can see a problem showing only zero '0' for number of samples.
>
> If you do that at that point, don't you have to change the TUI not to do
> it again?
>
> - Arnaldo
>
Yes, there isn't the same problem when using 't' on TUI of 'perf annotate'.
(As you know, 't' is show-total-period option)
In 'annotate' TUI, we can use the 't' functionality without the problem.
Because of the code (util/annotate.c:911 and ui/browsers/annotate.c:412)
as below.
881 double disasm__calc_percent(struct annotation *notes, int evidx,
s64 offset,
882 s64 end, const char **path, u64
*nr_samples)
883 {
...
910 if (h->sum) {
911 *nr_samples = hits;
And,
378 static void annotate_browser__calc_percent(struct annotate_browser
*browser,
379 struct perf_evsel *evsel)
380 {
...
407 bpos->samples[i].percent =
disasm__calc_percent(notes,
408 evsel->idx + i,
409 pos->offset,
410 next ?
next->offset : len,
411 &path, &nr_samples);
412 bpos->samples[i].nr = nr_samples;
And 'perf annotate --stdio --show-total-period' hasn't the problem, too.
Because of the same code (util/annotate.c:911).
But if with '-l', i.e. 'perf annotate --stdio -l --show-total-period',
the problem happen. Because 'nr' of source_line_samples aren't
ordinarily set
in symbol__get_source_line() (util/annotate.c:1634~..)
,so fix it as this patch
Are there something I missed or misunderstand ?
Thanks,
Taeung
>> 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 it was missed to set number of samples
>> of source_line_samples, so set it ordinarily.
>>
>> 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>
>> Cc: Martin Liska <mliska@...e.cz>
>> Fixes: 0c4a5bcea460 ("perf annotate: Display total number of samples with --show-total-period")
>> 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
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