linux-kernel - Re: [PATCH v3] perf report: Fix regression when decoding intelPT traces

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Date:   Tue, 19 Dec 2017 08:17:05 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] perf report: Fix regression when decoding intelPT traces

On 18 December 2017 at 17:38, Jiri Olsa <jolsa@...hat.com> wrote:
> On Mon, Dec 18, 2017 at 11:17:50AM -0700, Mathieu Poirier wrote:
>> 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.
>>
>> 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>
>> ---
>> Change for v3:
>> - Fixed brain bug code spotted by Adrian.
>
> ugh, mamma mia.. ack ;-)

... my brain bug that is.

>
> jirka
>
>> ---
>>  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
>>