linux-kernel - Re: [PATCH] perf, tool: Fix the array pointer to follow event data properly

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Date:	Sat, 24 Mar 2012 10:00:06 -0600
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf, tool: Fix the array pointer to follow event data
 properly

Stephane submitted a similar patch a week ago:
https://lkml.org/lkml/2012/3/17/91

David


On 3/24/12 8:19 AM, Jiri Olsa wrote:
> Currently we dont update the 'array' pointer properly after
> processing the RAW data. This way perf might report wrong data
> for branch stack if it is used along with tracepoint sample.
>
> I'm not sure tracepoint could be connected with branch stack,
> but I think the array pointer should have correct value after
> each sample processing.
>
> Signed-off-by: Jiri Olsa<jolsa@...hat.com>
> ---
>   tools/perf/util/evsel.c |    1 +
>   1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index d9da62a..56a96896 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -580,6 +580,7 @@ int perf_event__parse_sample(const union perf_event *event, u64 type,
>   			return -EFAULT;
>
>   		data->raw_data = (void *) pdata;
> +		array = (u64 *)(((char *)array) + data->raw_size + sizeof(u32));
>   	}
>
>   	if (type&  PERF_SAMPLE_BRANCH_STACK) {

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