linux-kernel - Re: [PATCH 1/2] perf script: Fix PERF_SAMPLE_WEIGHT

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Message-ID: <dc6926ac-4b8f-4421-088b-94436bdc3bad@redhat.com>
Date:   Wed, 29 Sep 2021 16:22:19 -0400
From:   Joe Mario <jmario@...hat.com>
To:     kan.liang@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 1/2] perf script: Fix PERF_SAMPLE_WEIGHT_STRUCT support



On 9/29/21 2:42 PM, Jiri Olsa wrote:
> On Wed, Sep 29, 2021 at 01:54:39PM -0300, Arnaldo Carvalho de Melo wrote:
>> Em Wed, Sep 29, 2021 at 08:38:13AM -0700, kan.liang@...ux.intel.com escreveu:
>>> From: Kan Liang <kan.liang@...ux.intel.com>
>>>
>>> -F weight in perf script is broken.
>>>
>>>   # ./perf mem record
>>>   # ./perf script -F weight
>>>   Samples for 'dummy:HG' event do not have WEIGHT attribute set. Cannot
>>> print 'weight' field.
>>>
>>> The sample type, PERF_SAMPLE_WEIGHT_STRUCT, is an alternative of the
>>> PERF_SAMPLE_WEIGHT sample type. They share the same space, weight. The
>>> lower 32 bits are exactly the same for both sample type. The higher 32
>>> bits may be different for different architecture. For a new kernel on
>>> x86, the PERF_SAMPLE_WEIGHT_STRUCT is used. For an old kernel or other
>>> ARCHs, the PERF_SAMPLE_WEIGHT is used.
>>>
>>> With -F weight, current perf script will only check the input string
>>> "weight" with the PERF_SAMPLE_WEIGHT sample type. Because the commit
>>> ea8d0ed6eae3 ("perf tools: Support PERF_SAMPLE_WEIGHT_STRUCT") didn't
>>> update the PERF_SAMPLE_WEIGHT_STRUCT sample type for perf script. For a
>>> new kernel on x86, the check fails.
>>>
>>> Use PERF_SAMPLE_WEIGHT_TYPE, which supports both sample types, to
>>> replace PERF_SAMPLE_WEIGHT.
>>>
>>> Reported-by: Joe Mario <jmario@...hat.com>
>>> Fixes: ea8d0ed6eae3 ("perf tools: Support PERF_SAMPLE_WEIGHT_STRUCT")
>>
>> Hey Joe, Jiri,
>>
>> 	Can I have your Tested-by?
> 
> Acked/Tested-by: Jiri Olsa <jolsa@...hat.com>
> 
> thanks,
> jirka

 Acked/Tested-by: Joe Mario <jmario@...hat.com>

 The "perf script -F weight" command works correctly.

 And I also verified that when just issuing "perf script", that the weight (cycle latency) 
 column that was missing with this bug, is now fixed and working properly.

 Thanks,
 Joe
> 
>>
>> Thanks,
>>
>> - Arnaldo
>>
>>> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
>>> ---
>>>  tools/perf/builtin-script.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
>>> index 6211d0b..9f62ac6 100644
>>> --- a/tools/perf/builtin-script.c
>>> +++ b/tools/perf/builtin-script.c
>>> @@ -459,7 +459,7 @@ static int evsel__check_attr(struct evsel *evsel, struct perf_session *session)
>>>  		return -EINVAL;
>>>  
>>>  	if (PRINT_FIELD(WEIGHT) &&
>>> -	    evsel__check_stype(evsel, PERF_SAMPLE_WEIGHT, "WEIGHT", PERF_OUTPUT_WEIGHT))
>>> +	    evsel__check_stype(evsel, PERF_SAMPLE_WEIGHT_TYPE, "WEIGHT", PERF_OUTPUT_WEIGHT))
>>>  		return -EINVAL;
>>>  
>>>  	if (PRINT_FIELD(SYM) &&
>>> -- 
>>> 2.7.4
>>
>> -- 
>>
>> - Arnaldo
>>
>