linux-kernel - Re: [PATCH v2 2/2] perf test: Add support for setting objdump binary via perf config

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Date:   Thu, 9 Nov 2023 10:26:34 +0000
From:   James Clark <james.clark@....com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-perf-users@...r.kernel.org, irogers@...gle.com,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Yonghong Song <yhs@...com>,
        Fangrui Song <maskray@...gle.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v2 2/2] perf test: Add support for setting objdump binary
 via perf config



On 08/11/2023 20:53, Arnaldo Carvalho de Melo wrote:
> Em Mon, Nov 06, 2023 at 03:10:49PM +0000, James Clark escreveu:
>> Add a perf config variable that does the same thing as "perf test
>> --objdump <x>".
>>
>> Also update the man page.
> 
> That is ok, if one wants to change objdump just for testing, as a
> followup improvement it may be interesting to allow that for the other
> tools that have --objdump as well as to add this as a global option,
> that affects all tools, no?

For the tools they already all share annotate.objdump in the config. Do
you mean that the tests could share the same config instead?

Maybe I could have used annotate.objdump for the tests, but it was used
in a slightly different way, and I thought it would be easier for people
to find if it started with "test."

> 
> Anyway, applied both patches.
> 
> - Arnaldo
>  
>> Signed-off-by: James Clark <james.clark@....com>
>> ---
>>  tools/perf/Documentation/perf-config.txt |  4 ++++
>>  tools/perf/tests/builtin-test.c          | 12 ++++++++++++
>>  2 files changed, 16 insertions(+)
>>
>> diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
>> index 0b4e79dbd3f6..16398babd1ef 100644
>> --- a/tools/perf/Documentation/perf-config.txt
>> +++ b/tools/perf/Documentation/perf-config.txt
>> @@ -722,6 +722,10 @@ session-<NAME>.*::
>>  		Defines new record session for daemon. The value is record's
>>  		command line without the 'record' keyword.
>>  
>> +test.*::
>> +
>> +	test.objdump::
>> +		objdump binary to use for disassembly and annotations.
>>  
>>  SEE ALSO
>>  --------
>> diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
>> index a8d17dd50588..113e92119e1d 100644
>> --- a/tools/perf/tests/builtin-test.c
>> +++ b/tools/perf/tests/builtin-test.c
>> @@ -14,6 +14,7 @@
>>  #include <sys/wait.h>
>>  #include <sys/stat.h>
>>  #include "builtin.h"
>> +#include "config.h"
>>  #include "hist.h"
>>  #include "intlist.h"
>>  #include "tests.h"
>> @@ -514,6 +515,15 @@ static int run_workload(const char *work, int argc, const char **argv)
>>  	return -1;
>>  }
>>  
>> +static int perf_test__config(const char *var, const char *value,
>> +			     void *data __maybe_unused)
>> +{
>> +	if (!strcmp(var, "test.objdump"))
>> +		test_objdump_path = value;
>> +
>> +	return 0;
>> +}
>> +
>>  int cmd_test(int argc, const char **argv)
>>  {
>>  	const char *test_usage[] = {
>> @@ -541,6 +551,8 @@ int cmd_test(int argc, const char **argv)
>>          if (ret < 0)
>>                  return ret;
>>  
>> +	perf_config(perf_test__config, NULL);
>> +
>>  	/* Unbuffered output */
>>  	setvbuf(stdout, NULL, _IONBF, 0);
>>  
>> -- 
>> 2.34.1
>>
>