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

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Date:   Tue, 19 Dec 2017 01:38:43 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     acme@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] perf report: Fix regression when decoding intelPT
 traces

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 ;-)

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
>