linux-kernel - Re: [PATCH v4] perf report: Fix regression when decoding intelPT traces

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Date:   Fri, 19 Jan 2018 09:12:49 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>, jolsa@...hat.com,
        peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] perf report: Fix regression when decoding intelPT
 traces

On 18/01/18 18:29, Arnaldo Carvalho de Melo wrote:
> Em Wed, Jan 10, 2018 at 01:31:52PM -0700, Mathieu Poirier escreveu:
>> Commit (93d10af26bb7 perf tools: Optimize sample parsing for ordered
>> events) breaks intelPT trace decoding by invariably returning an error if
>> the event type isn't a PERF_SAMPLE_TIME.
> 
> Adrian, have you had the chance of looking at this?
> 
> I'm tentatively applying with Jiri's ack.

Yes, it is fine.  FWIW

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> 
> - Arnaldo
>  
>> With this patch the timestamp is initialised and processing is allowed to
>> continue if the error returned by function
>> perf_evlist__parse_sample_timestamp() is not a fault.
>>
>> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
>> Acked-by: Jiri Olsa <jolsa@...hat.com>
>> ---
>> Changes for v4:
>> - Rebased to latest perf/core branch
>> - Added Jiri's ACK
>> ---
>>  tools/perf/util/session.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
>> index 54e30f1bcbd7..07221884f725 100644
>> --- a/tools/perf/util/session.c
>> +++ b/tools/perf/util/session.c
>> @@ -1508,10 +1508,10 @@ static s64 perf_session__process_event(struct perf_session *session,
>>  		return perf_session__process_user_event(session, event, file_offset);
>>  
>>  	if (tool->ordered_events) {
>> -		u64 timestamp;
>> +		u64 timestamp = -1ULL;
>>  
>>  		ret = perf_evlist__parse_sample_timestamp(evlist, event, &timestamp);
>> -		if (ret)
>> +		if (ret && ret != -1)
>>  			return ret;
>>  
>>  		ret = perf_session__queue_event(session, event, timestamp, file_offset);
>> -- 
>> 2.7.4
>