linux-kernel - Re: [PATCH 15/41] perf script: Improve srcline display for BTS

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Date:	Tue, 15 Jul 2014 20:51:55 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 15/41] perf script: Improve srcline display for BTS

On 15/07/2014 5:16 p.m., Arnaldo Carvalho de Melo wrote:
> Em Mon, Jul 14, 2014 at 01:02:39PM +0300, Adrian Hunter escreveu:
>> Change the order of the output to put the srcline last.
>> e.g. old format:
>>
>>            4028fc main+0x2c (/bin/ls)
>>    /build/buildd/coreutils-8.20/src/ls.c:1269 =>           40d8a0 set_program_name+0x0 (/bin/ls)
>>
>> new format:
>>
>>            4028fc main+0x2c (/bin/ls) =>           40d8a0 set_program_name+0x0 (/bin/ls)
>>    /build/buildd/coreutils-8.20/src/ls.c:1269
>
> David,
>
> 	Can I have your acked-by?
>
> Adrian,
>
> 	Can you elaborate on why this is an improvement?

It puts the branch 'from address' and 'to address' on the same line,
which is how it would be without the source line reference.  So it
makes it consistent and much easier to read.


>
> - Arnaldo
>
>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
>> ---
>>   tools/perf/builtin-script.c | 20 +++++++++++++++-----
>>   1 file changed, 15 insertions(+), 5 deletions(-)
>>
>> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
>> index 9e9c91f..333b15e 100644
>> --- a/tools/perf/builtin-script.c
>> +++ b/tools/perf/builtin-script.c
>> @@ -427,15 +427,22 @@ static void print_sample_bts(union perf_event *event,
>>   			     struct addr_location *al)
>>   {
>>   	struct perf_event_attr *attr = &evsel->attr;
>> +	bool print_srcline_last = false;
>>
>>   	/* print branch_from information */
>>   	if (PRINT_FIELD(IP)) {
>> -		if (!symbol_conf.use_callchain)
>> -			printf(" ");
>> -		else
>> +		unsigned int print_opts = output[attr->type].print_ip_opts;
>> +
>> +		if (symbol_conf.use_callchain && sample->callchain) {
>>   			printf("\n");
>> -		perf_evsel__print_ip(evsel, sample, al,
>> -				     output[attr->type].print_ip_opts,
>> +		} else {
>> +			printf(" ");
>> +			if (print_opts & PRINT_IP_OPT_SRCLINE) {
>> +				print_srcline_last = true;
>> +				print_opts &= ~PRINT_IP_OPT_SRCLINE;
>> +			}
>> +		}
>> +		perf_evsel__print_ip(evsel, sample, al, print_opts,
>>   				     PERF_MAX_STACK_DEPTH);
>>   	}
>>
>> @@ -447,6 +454,9 @@ static void print_sample_bts(union perf_event *event,
>>   	     !output[attr->type].user_set))
>>   		print_sample_addr(event, sample, al->machine, thread, attr);
>>
>> +	if (print_srcline_last)
>> +		map__fprintf_srcline(al->map, al->addr, "\n  ", stdout);
>> +
>>   	printf("\n");
>>   }
>>
>> --
>> 1.8.3.2
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