linux-kernel - Re: [PATCH] perf annotate: Don't prepend symfs path to build_id

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Date:   Fri, 9 Mar 2018 14:26:27 -0500
From:   Martin Vuille <jpmv27@....com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf annotate: Don't prepend symfs path to
 build_id_filename

dso__build_id_filename calls build_id_cache__linkname

build_id_cache__linkname uses buildid_dir

symbol__config_symfs includes the symfs directory in buildid_dir

So it's not necessary to prepend it again.


Should've included those notes in the original submission.

Will do better next time.

MV


On 03/09/18 14:07, Arnaldo Carvalho de Melo wrote:
> Em Sun, Feb 11, 2018 at 02:19:37PM -0500, Martin Vuille escreveu:
>> build_id_filename already contains symfs path if applicable, so
>> don't prepend it a second time.
> Where is the analysis that shows that that is the case? I looked here at
> the implementation for dso__build_id_filename() and couldn't find where
> was it that the symfs would be appended, can you clarify?
>
> - Arnaldo
>   
>> Signed-off-by: Martin Vuille <jpmv27@....com>
>> ---
>>   tools/perf/util/annotate.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
>> index 28b233c3dcbe..425b7f0760ec 100644
>> --- a/tools/perf/util/annotate.c
>> +++ b/tools/perf/util/annotate.c
>> @@ -1381,7 +1381,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
>>   
>>   	build_id_filename = dso__build_id_filename(dso, NULL, 0, false);
>>   	if (build_id_filename) {
>> -		__symbol__join_symfs(filename, filename_size, build_id_filename);
>> +		scnprintf(filename, filename_size, "%s", build_id_filename);
>>   		free(build_id_filename);
>>   	} else {
>>   		if (dso->has_build_id)
>> -- 
>> 2.13.6