linux-kernel - Re: [PATCH v4 05/18] perf: add minimal support for PERF_SAMPLE

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Date:	Wed, 2 Jan 2013 15:07:52 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, namhyung.kim@....com
Subject: Re: [PATCH v4 05/18] perf: add minimal support for PERF_SAMPLE_WEIGHT

On Thu, Dec 20, 2012 at 04:41:35PM +0100, Stephane Eranian wrote:
> Ensure we grab the weight from  raw sample struct
> and that we can dump it via perf report -D.
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
>  tools/perf/util/event.h   |    1 +
>  tools/perf/util/evsel.c   |    5 +++++
>  tools/perf/util/session.c |    3 +++
>  3 files changed, 9 insertions(+)
> 
> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> index 0d573ff..cf52977 100644
> --- a/tools/perf/util/event.h
> +++ b/tools/perf/util/event.h
> @@ -90,6 +90,7 @@ struct perf_sample {
>  	u64 period;
>  	u32 cpu;
>  	u32 raw_size;
> +	u64 weight;
>  	void *raw_data;
>  	struct ip_callchain *callchain;
>  	struct branch_stack *branch_stack;
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 1b16dd1..4374c07 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1058,6 +1058,11 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
>  		}
>  	}
>  
> +	if (type & PERF_SAMPLE_WEIGHT) {
> +		data->weight= *array;
> +		array++;
> +	}
> +

this bit should be placed right after PERF_SAMPLE_PERIOD (where
you placed it in kernel path), otherwise you get wrong data

jirka
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